Journal articles on the topic 'Engine insulation'
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1
Kawaguchi, Akio, Yoshifumi Wakisaka, Naoki Nishikawa, Hidemasa Kosaka, Hideo Yamashita, Chikanori Yamashita, Hiroki Iguma, Kenji Fukui, Noriyuki Takada, and Terutoshi Tomoda. "Thermo-swing insulation to reduce heat loss from the combustion chamber wall of a diesel engine." International Journal of Engine Research 20, no. 7 (June 10, 2019): 805–16. http://dx.doi.org/10.1177/1468087419852013.
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Cooling heat loss is one of the most dominant losses among the various engine losses to be reduced. Although many attempts to reduce it by insulating the combustion chamber wall have been carried out, most of them have not been successful. Charge air heating by the constantly high temperature insulating wall is a significant issue, because it deteriorates charging efficiency, increases the emissions of soot and NOx in diesel engines, and promotes the knock occurrence tendency in gasoline engines. A new concept heat insulation methodology which can reduce cooling heat loss without heating the charging air has been developed. Surface temperature of insulation coating on the combustion chamber wall changes rapidly, according to the quickly changing in-cylinder gas temperature in each engine stroke. During the compression and expansion stroke, the surface temperature of the insulation coating goes up rapidly, and consequently, the heat transfer becomes lower by the reduced temperature difference between the surface and the gas. During the intake stroke, the surface temperature goes down rapidly, and it prevents intake air heating from the wall. To realize the above-mentioned functionality, a thin coating layer with low thermal conductivity and low heat capacity was developed. It was applied on the pistons of diesel engines, and showed improvement in thermal efficiency. It also showed a reduction of unburnt fuel emission in low temperature engine starting condition. The energy balance analysis showed reduction of cooling heat loss and, on the contrary, increase in the brake power and the exhaust loss.
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Prasetyo, Yanwar, and Anas Mukhtar. "Pengaruh Pola Pelapisan Isolator di Bagian Header Terhadap Temperatur Knalpot Sepeda Motor." V-MAC (Virtual of Mechanical Engineering Article) 7, no. 1 (April 26, 2022): 10–13. http://dx.doi.org/10.36526/v-mac.v7i1.1947.
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The heat of vehicle engine emission is still can be used in order to efficiency effort and thermal polution preventive activity. This research is aimed to get the effect of the insulator coating pattern on the header on the motorcycle exhaust temperature. The reserach is done for Honda Scoopy motorcycle with engine rotation vary as 1000, 1500 and 2000 rpm. Isolator insulation vary for insulation pattern as 0, 1 and 2 cm in distance. The temperatures of exhaust are measured in 4 points measurement with K type thermocouple. The result shows that insulator coating pattern affects the temperature of the exhaust gas heat dissipation exhaust pipe (header) motorcycle exhaust.
Keywords: header, exhaust, isolator insulation, heat
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Amann, C. A. "Promises and Challenges of the Low-Heat-Rejection Diesel." Journal of Engineering for Gas Turbines and Power 110, no. 3 (July 1, 1988): 475–81. http://dx.doi.org/10.1115/1.3240145.
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The low-heat-rejection (LHR) diesel promises decreased engine fuel consumption by eliminating the traditional liquid cooling system and converting energy normally lost to the coolant into useful shaft work instead. However, most of the cooling energy thus conserved is transferred into the exhaust stream rather than augmenting crankshaft output directly, so exhaust-energy recovery is necessary to realize the full potential of the LHR engine. The higher combustion temperature of the LHR diesel favors increased emission of NOx, with published results on hydrocarbon and particulate emissions showing mixed results. The cylinder insulation used to effect low heat rejection influences convective heat loss only, and in a manner still somewhat controversial. The cyclic aspect of convective heat loss, and radiation from incandescent soot particles, also deserve attention. The temperatures resulting from insulating the cylinder of the LHR diesel require advancements in lubrication. The engine designer must learn to deal with the probabilistic nature of failure in brittle ceramics needed for engine construction. Whether ceramic monoliths or coatings are more appropriate for cylinder insulation remains unsettled. These challenges confronting the LHR diesel are reviewed.
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Yu, Minji, and Jang-Seok Park. "Development of Dash insulation with PU elastomer based sound insulation materials for increasing the sound insulation performances of electric vehicle noise derived from motor." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 5 (August 1, 2021): 1804–6. http://dx.doi.org/10.3397/in-2021-1954.
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At present, fuel efficiency improvement technologies for example weight, engine efficiency improvement, design modification, and eco-friendly car are being proceed due to the tightened international regulations. Therefore, production of eco-friendly cars specially electric car has increased. Due to that, the main noise source has changed from engine to motor noise and road noise as it has been changed from engine cars that have led engine technology to eco-friendly cars. As the noise source has changed, it is necessary to manufacture sound absorption/insulation structure for the noise characteristics generated by electric vehicles. In this work, the elastomer sheet was applied to the Dash outer as automotive terior parts for reducing engine noise. We applied the elastomer sheets for generation Dash outer layers (nonwooven/PU foam/nonwooven) to improve sound insulation properties. The elastomer sheet showed surface wetting between PU foam and elastomer sheets by optical microscopy. The acoustic properties were measured by APAMAT-II and BUCK tests.
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Dhimas Satria, Rina Lusiani, Erny Listijorini, and Aswata. "Analisa Isolasi Pipa Generator Mesin Stirling Tipe Alpha Sudut Fasa 180°." R.E.M. (Rekayasa Energi Manufaktur) Jurnal 6, no. 1 (June 25, 2021): 1–7. http://dx.doi.org/10.21070/r.e.m.v6i1.1058.
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This research is a development of previous research, where in the previous research, a design innovation was carried out on an alpha-type stirling engine by making the phase angle to 180o, with the aim of reducing the effect when the cold cylinder is compressed, because the phase angle currently used is (90o) with disadvantages, namely the cold cylinder is perpendicular to the top, so that the compression process against gravity. But in previous studies, the generator pipe was too long, causing a lot of energy or heat loss (heat loss) so that the compression speed was small. So that in the research, innovated and analyzed the pipe insulation of alpha-type stirling engine generators, alpha-type stirling engines, 180o phase angle. The research method used is to use the thermodynamic approach with Schmidt theory and the theory of the ideal cycle stirling engine. while the simulation is done using the Ideal Stirling Cycle Calculator. Results investigated shows that providing insulation on the generator pipes of an alpha-type stirling engine for an alpha-type stirling engine with a 180o phase angle is proven to reduce a lot of energy or heat loss (heat loss) due to too long generator pipes, with a heat loss value ratio of 226.66 W for the pipe. generator that uses insulation whose value is smaller than the value of the heat loss when the generator pipe without using isocation is 1,584.12 W.
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Chérel, Jérôme, Jean-Marc Zaccardi, Bernard Bouteiller, and Alain Allimant. "Experimental assessment of new insulation coatings for lean burn spark-ignited engines." Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles 75 (2020): 11. http://dx.doi.org/10.2516/ogst/2020006.
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Clean and highly efficient internal combustion engines will still be necessary in the future to meet the ambitious CO2 emissions reduction targets set for light-duty vehicles. The maximal efficiency of stoichiometric Spark-Ignited (SI) gasoline engines has been steadily increasing in recent years but remains limited by the important relative share of cooling losses. Low heat rejection engines using ceramic barrier coatings have been presented in the past but smart insulation coatings are gaining a renewed interest as a more promising way to further increase the engine maximal thermal efficiency. This article is highlighting some important effects of smart insulation coatings developed for lean-burn spark-ignited gasoline engines. Five different coatings with low heat conductivity and capacity are applied on aluminum engine parts with the atmospheric plasma spray technique and are tested with two different engines. The laser induced phosphorescence technique is firstly used in an optical single cylinder engine to quantify the thermal performance of these coatings in terms of temperature swing during combustion. A maximal increase in the piston surface temperature of around 100 °C is measured at low load, confirming thus the expected impact of the low heat conductivity and capacity, and suggesting thus a positive impact on fuel consumption. Thanks to the tests performed with a similar metal single cylinder engine, it is shown that the unburned hydrocarbon emissions can significantly increase by up to 25% if the open porosity on top of the coating is not properly sealed, while the surface roughness has no impact on these emissions. When applied on both the piston and the cylinder head, the optimized coating displays some distinct effects on the maximal heat release rate and NOx emissions, indicating that the thermal environment inside the combustion chamber is modified during combustion. Thanks to the temperature swing between cold and hot engine phases the volumetric efficiency can also be kept constant. However, no increase in efficiency can be measured with this optimized coating which suggests that the heat balance is not affected only by the reduction in the temperature differential between the walls and the gas.
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Pokusaev, Mikhail Nikolaevich, Alexei Viktorovich Trifonov, and Vasiliy Aleksandrovich Kostyrenko. "Developing cooling system for small-sized marine diesel engines operating at different seawate temperatures in laboratory conditions." Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies 2022, no. 2 (May 31, 2022): 51–57. http://dx.doi.org/10.24143/2073-1574-2022-2-51-57.
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Using a cooling system in water transport is considered the most effective way to increase the energy efficiency of a vessel. Currently, closed-loop cooling systems and frequency-controlled drives of seawater electric pumps are actively used. An option of improving the energy efficiency of cooling systems with mounted seawater pumps is being studied. The hydraulic scheme of the unit with an energy-efficient ship engine cooling system is presented. To study ways to reduce mechanical losses in the drive of auxiliary mechanisms of a marine engine, the laboratory “Marine Diesels” of Astrakhan State Technical University developed a test bench for the Iveco 8041I06 engine. The engine cooling system does not have a thermostat to control the thermal state; instead of a thermostat on the engine, an electronically controlled variator is installed between the engine power take-off shaft and the VKS 1/16 pump. At a constant engine speed, the variator allows changing the pump speed, supply of sea water through the heat exchanger and regulating the thermal state of the engine. It has been found that during engine tests it is necessary to maintain the temperature of the outboard water constant. A description is given of the use of tanks with thermal insulation at the stand to reduce heat exchange with the environment. Variants of types of containers and materials for insulation are considered. To prepare water of the required temperature a chiller is connected to the cooling system at the experimental stand. The calculation of thermal insulation and comparison of the result with a real test is given. On the stands for testing diesel engines the change in the thermal state of the engine is carried out only by changing the load on the engine. On the developed stand, the thermal state can also be changed, including by controlling the seawater temperature, which expands its capabilities for modeling real processes.
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Mahdi, Qusay Adnan, Ibtihal A. Mhmood, and Mahmoud A. Mashhour. "Thermal fatigue analysis of different nano coating thickness by air plasma spraying in diesel engine thermal barrier coating." Curved and Layered Structures 9, no. 1 (January 1, 2022): 365–81. http://dx.doi.org/10.1515/cls-2022-0028.
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Abstract The use of Atmospheric Plasma Spraying (APS) and yttria stabilized zirconia (YSZ) nanostructured coatings has been applied to the bond layer of NiCrAlY coated engine cylinder heads, pistons, and valve substrates. Thermal barrier coatings (TBCs) have been utilized to increase the engine performance in the design of combustion chamber components for internal combustion engines. ASTM-C-633-01 standard has been employed to conduct the bonding strength testing. It was also considered and directed to estimate the coating’s thermal performance by evaluating its insulation value and conducting a thermal insulation durability assessment. Field emission scanning electron microscope (FESEM) and X-ray diffraction (XRD) were used to look at the nano powders and coatings’ microstructures and phase compositions. In YSZ, it was discovered that the topcoat of samples had a tri-modal pattern of nano sized particles engaged by the powder, micro-columnar grains generated from the re-solidification of the molten part of the powder, and almost equiaxed grains, which were a unique construction feature. The results demonstrated the creation of nano zones in one of three nanostructured coating zones and improved the top coating properties, including bonding strength and thermal insulation capacity. The high temperature of the diesel engine caused fatigue failure in the intake and exhaust valves.
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Marchenko, Andriy, Volodymyr Shpakovskyy, and Volodymyr Volikov. "Cordunum pistons increase diesel engine economy and reliability." Acta Innovations, no. 33 (October 1, 2019): 28–37. http://dx.doi.org/10.32933/actainnovations.33.3.
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Taking into account the oil resources depletion the requirements to fuel consumption of internal combustion engines are now increasing as well as to their reliability and durability. With the continual increase in the number of internal combustion engines in operation, along with the problem of parts of the cylinder piston group wearing out has caused exhaust from such engines to be one of the main source of harmful pollutant emissions in cities. Therefore, environmental requirements have in turn increased dramatically. The engine resource and its efficiency largely depend on the process of fuel combustion in the combustion chamber. Experimental studies aimed to improve the working process on diesel engines by piston insulation have shown an effective decrease in fuel consumption by reducing heat loss and more complete fuel combustion. When oxide ceramic coatings were used on the piston and cylinder head, the maximum power increased and the specific fuel consumption decreased. However ceramic coatings are not widely used due to their peeling. We have developed a technology for the galvanic plasma treatment of pistons, which made it possible to obtain on the pistons surface made of aluminum alloys a ceramic corundum layer with high adhesion to the base metal that does not peel and has electret properties. In 1993, pistons with a corundum surface layer were installed in a shunting diesel locomotive and life-time running tests were conducted. Such pistons increased wear resistance, reduced the wear of cylinder liners, increased the strength of the annular jumpers, and were not prone to burnouts and scuffing. They provided an increase in the resource of the cylinder-piston group of the diesel engine by more than 125 thousand engine hours. The paper provides an analysis of the effect of corundum pistons thermal insulation on significant increasing the, engine power and fuel consumption reduction. Basing on experimental bench studies of a gasoline engine, a tractor diesel engine and long-term operational life tests of diesel engines, an attempt had been made to explain the reasons for the improvement in the engines’ efficiency.
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Xie, Lu, Guozhang Jiang, and Feng Qian. "Research on Aftertreatment Inlet_Outlet Insulation for A Nonroad Middle Range Diesel Engine." Catalysts 10, no. 4 (April 22, 2020): 454. http://dx.doi.org/10.3390/catal10040454.
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Diesel exhaust aftertreatment systems are required for meeting China StageIV emission regulations. This paper addresses an aftertreatment system designed to meet the China StageIV emission standards for nonroad vehicle markets. It presents a comprehensive experimental research work on aftertreatment skin temperature and the radiated impact on its neighboring parts in a nonroad vehicle powered by a middle range diesel engine under aftertreatment inlet/outlet with insulation and without insulation with multiple experimental conditions, as well as validating the emission results with these two different aftertreatment configurations. According to the experimental results, it can be observed that the aftertreatment inlet/outlet with insulation and without insulation using a Diesel Oxidant Catalyst (DOC) + Diesel Particle Filter (DPF) + Selective Catalytic Reduction (SCR) scheme could both meet China StageIV emission regulations and the whole vehicle arrangement. The connection pipe is generally short between the aftertreatment and the engine turbo charger on nonroad application vehicles, which results in the exhaust gas temperature of the internal aftertreatment at each point being similar, with variation within ±2% for the aftertreatment inlet/outlet with insulation compared to the aftertreatment inlet/outlet without insulation. The aftertreatment skin temperature differences under these two configurations occur on the inlet module and outlet module, and the skin temperatures of other aftertreatment modules are little impacted. These experimental results also validate the radiation model. All aftertreatment skin temperatures are measured with different experimental conditions. In future, if considering integrating other parts like sensors on the surface of the aftertreatment, the configuration with insulation is recommended. As per the experimental results, the maximum inlet skin temperature can lower nearly 50% with insulation and the maximum outlet temperature could lower about 28% compared to the configuration without inlet/outlet insulation. If taking cost into consideration, the configuration without insulation is suggested. This research also introduces alternative solutions for different concerns for real applications. The methodology provides effective guidance and reference for future aftertreatment insulation considerations for inlet modules and outlet modules on real applications.
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N, Venkat Karthik, Suresh Kumar V, Yuvaraj K, Balaji ., and Palani . "FEA Analysis and Experimental Investigation of the Ceramic Coating on Aluminum Piston Material By Plasma Spray Coating Technique." International Journal for Research in Applied Science and Engineering Technology 10, no. 3 (March 31, 2022): 990–1001. http://dx.doi.org/10.22214/ijraset.2022.40765.
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Abstract: Functionally graded materials are of widespread interest because of their superior properties such as corrosion, erosion and oxidation resistance, high hardness, chemical and thermal stability at cryogenic and high temperatures. These properties make them useful for many applications, including Thermal Barrier Coating (TBC) on metallic substrates used at high temperatures in the fields of aircraft and aerospace, especially for thermal protection of components in gas turbines and diesel engines. The application of TBC reduces the heat loss to the engine cooling-jacket through the surface exposed to the heat transfer such as the cylinder head, liner, piston crown and piston rings. The insulation of the combustion chamber with ceramic coating affects the combustion process and, hence, the performance and exhaust emissions characteristics of the engines improve. In this project, the main emphasis is placed on the study of thermal behavior of functionally graded coatings obtained by means of using a commercial code, ANSYS on aluminum and steel piston surfaces and the results are verified with numerical and experimental works. Keywords: Thermal Barrier Coating, Piston, Insulation, Corrosion, ANSYS, engine cooling-jacket.
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Sareh, Daneshgar, Zahedi Rahim, and Asemi Hamidreza. "Experimental investigation of gamma stirling engine coupling to convert thermal to cooling energy in different laboratory conditions." Global Journal of Biotechnology and Biomaterial Science 8, no. 1 (June 14, 2022): 009–22. http://dx.doi.org/10.17352/gjbbs.000017.
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The main aim of this research is to experimentally investigate the two coupled identical ST500 gamma-type Stirling engines and convert thermal energy to cooling energy. Using a new structure and two coupled Stirling engines at different temperatures and pressures and the use of biomass fuel within the 4 -8 bar average pressure range of the first engine heat source, the 1-4 bar average pressure range of the second engine heat sink, and Stirling heat engine temperature range of 480-580 ºC, the effective cooling is obtained in the cooling engine. In doing tests, attempts were made to reach lower than 9 percent error results in different parts of the engine, including insulation, fluid leakage, belt loss, and measurement devices. According to the obtained results, 8 bars increase in the average pressure range of the gas in the first engine heat source, a 1 bar reduction in the average pressure range of the gas in the second engine heat sink, the increased temperature of the heat source up to 580ºC, and the use of the light operating fluid such as helium will affect the generation of cooling up to-16ºC.
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Sham, Radhey, Rajesh Kumar Saluja, Gurwinder Singh, Vineet Kumar, and Shubham Parmar. "Experimental investigation to study the effects of using hot and partially cold EGR in direct injection diesel engine." TECHNOLOGY 04, no. 03 (September 2016): 170–73. http://dx.doi.org/10.1142/s2339547816500059.
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Major exhaust emissions from diesel engines are CO, CO2, PM, UHC and NOx, of which NOx is one of the most harmful. A number of techniques have been utilized to control NOx emissions and exhaust gas recirculation (EGR) is one of the widely used techniques that show outstanding results in NOx reduction in both light and heavy duty diesel engines. In the present study, the experiment has been conducted on a four-stroke, single-cylinder water cooled diesel engine. Here, a long-route EGR system was used in both hot (insulated) and partially cooled (without insulation) conditions. EGR rate was varied from 0 to 24% in steps of 6% and the engine ran at various load conditions. The research objective was to investigate the effects of varying EGR ratios and temperatures on engine performance parameters and determine the effective EGR rate where the engine gives high performance, low fuel consumption and produces low emissions.
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Liu, Yan, Yan Bin Jia, Xiao Juan Zhang, Zong Cai Liu, Yong Chao Ren, and Bing Yang. "Noise Test and Analysis of Automobile Engine." Applied Mechanics and Materials 307 (February 2013): 196–99. http://dx.doi.org/10.4028/www.scientific.net/amm.307.196.
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To test different car’s noise in a semi-anechoic room with different engine’s speed, measure and analysis engine noise’s characteristics and the dash panel’s sound insulation quantity. The conclusion is that：the engine noise gets bigger 10 dB(A) when engine speeds up every 1000 r/min; engine noise’s frequency mainly distributed in 1600 ~ 4000 Hz; peak part concentrates in the range 100 ~ 400 Hz; engine noise has no direct relation to engine’s displacement; cab noise frequency mainly concentrated in the range 250 ~ 630 Hz and the peaks exist in the intermediate and low frequency part, the high frequency part attenuates obviously which show the car’s dash panel has a good noise insulation and absorption effect in the high frequency part but not too ideal at the intermediate and low frequency especially in the range 250 ~ 630 Hz. These results have high practical value for the design of the automotive to decline noise and vibration.
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Rasihhan, Y., and F. J. Wallace. "Piston-Liner Thermal Resistance Model for Diesel Engine Simulation: Part 2: Application to various Insulation Schemes." Proceedings of the Institution of Mechanical Engineers, Part C: Mechanical Engineering Science 205, no. 5 (September 1991): 353–61. http://dx.doi.org/10.1243/pime_proc_1991_205_130_02.
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The piston-liner thermal resistance model, developed in Part 1, is applied to various piston and/or liner insulation schemes. The effects of insulation on piston-liner conduction and gas to wall heat fluxes and liner temperature distribution are examined. The small effect of insulation of the middle and lower parts of the liner is clearly shown.
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Shaaban, S., and J. Seume. "Impact of Turbocharger Non-Adiabatic Operation on Engine Volumetric Efficiency and Turbo Lag." International Journal of Rotating Machinery 2012 (2012): 1–11. http://dx.doi.org/10.1155/2012/625453.
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Turbocharger performance significantly affects the thermodynamic properties of the working fluid at engine boundaries and hence engine performance. Heat transfer takes place under all circumstances during turbocharger operation. This heat transfer affects the power produced by the turbine, the power consumed by the compressor, and the engine volumetric efficiency. Therefore, non-adiabatic turbocharger performance can restrict the engine charging process and hence engine performance. The present research work investigates the effect of turbocharger non-adiabatic performance on the engine charging process and turbo lag. Two passenger car turbochargers are experimentally and theoretically investigated. The effect of turbine casing insulation is also explored. The present investigation shows that thermal energy is transferred to the compressor under all circumstances. At high rotational speeds, thermal energy is first transferred to the compressor and latter from the compressor to the ambient. Therefore, the compressor appears to be “adiabatic” at high rotational speeds despite the complex heat transfer processes inside the compressor. A tangible effect of turbocharger non-adiabatic performance on the charging process is identified at turbocharger part load operation. The turbine power is the most affected operating parameter, followed by the engine volumetric efficiency. Insulating the turbine is recommended for reducing the turbine size and the turbo lag.
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Zhao, Keqin, Diming Lou, Yunhua Zhang, Liang Fang, and Yuanzhi Tang. "Experimental Study on Diesel Engine Emission Characteristics Based on Different Exhaust Pipe Coating Schemes." Micromachines 12, no. 10 (September 25, 2021): 1155. http://dx.doi.org/10.3390/mi12101155.
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The thermal insulation performance of exhaust pipes coated with various materials (basalt and glass fiber materials) under different braiding forms (sleeve, winding and felt types) and the effects on the emission characteristics of diesel engines were experimentally studied through engine bench tests. The results indicated that the thermal insulation performance of basalt fiber was higher than that of glass fiber, and more notably advantageous at the early stage of the diesel engine idle cold phase. The average temperature drop during the first 600 s of the basalt felt (BF) pipe was 2.6 °C smaller than that of the glass fiber felt (GF) pipe. Comparing the different braiding forms, the temperature decrease in the felt-type braided material was 2.6 °C and 2.9 °C smaller than that in the sleeve- and winding-type braided materials, respectively. The basalt material was better than the glass fiber material regarding the gaseous pollutant emission reduction performance, especially in the idling cold phase of diesel engines. The NOx conversion rate of the BF pipe was 7.4% higher than that of the GF pipe, and the hydrocarbon (HC) conversion rate was 2.3% higher than that of the GF pipe, while the CO conversion rate during the first 100 s was 24.5% higher than that of the GF pipe. However, the particulate matter emissions were not notably different.
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Andruskiewicz, Peter, Paul Najt, Russell Durrett, and Raul Payri. "Assessing the capability of conventional in-cylinder insulation materials in achieving temperature swing engine performance benefits." International Journal of Engine Research 19, no. 6 (September 8, 2017): 599–612. http://dx.doi.org/10.1177/1468087417729254.
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Materials that enable wall temperature swing to follow the gas temperature throughout a reciprocating internal combustion engine cycle promise the greatest benefits from in-cylinder insulation without detriments to volumetric efficiency or fuel autoignition behavior. An anisotropic barium–neodymium–titanate insulation was selected as a promising off-the-shelf material to begin investigating temperature swing characteristics while maintaining adequate strength and adherence to the aluminum components it was applied to. Experimental analysis showed that permeable porosity within the barium–neodymium–titanate coating resulted in increased heat losses despite thermal insulation, fuel absorption losses, and a reduction in compression ratio. Additionally, the thickest coating suffered severe degradation throughout testing. Any potential benefits of temperature swing insulation were dominated by these losses, emphasizing the need to maintain a sealed coating surface.
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Fei, Chun-Guang, Zuo-Qin Qian, Jie Ren, Xiang-Jun Zhou, and Si-Wei Zhu. "Numerical and Experimental Research on Thermal Insulation Performance of Marine Diesel Engine Piston Based on YSZ Thermal Barrier Coating." Coatings 11, no. 7 (June 25, 2021): 765. http://dx.doi.org/10.3390/coatings11070765.
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Although YSZ ceramic coating has been used in the field of aeroengines for a long time to protect blades from high temperature erosion, its application on marine engines is still very rare. In this study, YSZ powder was sprayed onto the upper surface of the Al-Si alloy piston by atmospheric plasma spraying. The piston with or without ceramic coatings was applied to the diesel engine bench, and the ship propulsion characteristics test was carried out to study the effect of the coating on the performance of the diesel engine when the ship was sailing. The temperature field results show that under 25% load, the temperature of the top surface of the coated piston is about 30.91 °C higher than that of the conventional piston. The increase in the temperature of the combustion chamber is conducive to better combustion of the fuel in the cylinder of the diesel engine. Therefore, when the marine diesel engine is tested for propulsion characteristics, the thermal efficiency is increased by 5% under the condition of 25% load.
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Uczak de Goes, Wellington, Joop Somhorst, Nicolaie Markocsan, Mohit Gupta, and Kseniya Illkova. "Suspension Plasma-Sprayed Thermal Barrier Coatings for Light-Duty Diesel Engines." Journal of Thermal Spray Technology 28, no. 7 (October 2019): 1674–87. http://dx.doi.org/10.1007/s11666-019-00923-8.
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Abstract Demands for improved fuel efficiency and reduced CO2 emissions of diesel engines have been the driving force for car industry in the past decades. One way to achieve this would be by using thermal spraying to apply a thermal insulation layer on parts of the engine’s combustion chamber. A candidate thermal spray process to give coatings with appropriate properties is suspension plasma spray (SPS). SPS, which uses a liquid feedstock for the deposition of finely structured columnar ceramic coatings, was investigated in this work for application in light-duty diesel engines. In this work, different spray processes and materials were explored to achieve coatings with optimized microstructure on the head of aluminum pistons used in diesel engine cars. The functional properties of the coatings were evaluated in single-cylinder engine experiments. The influence of thermo-physical properties of the coatings on their functional properties has been discussed. The influence of different spray processes on coating formation on the complex piston head profiles has been also discussed. The results show that SPS can be a promising technique for producing coatings on parts of the combustion chamber, which can possibly lead to higher engine efficiency in light-duty diesel engines.
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Baganov, Nikolay A., Vitaliy A. Alekseyenko, and Dmitriy A. Sidel’nikov. "ASSESSMENT OF THE THERMAL BALANCE IN THE THERMAL NEUTRALIZER TO REDUCE THE TOXICITY OF EXHAUST GASES." Tekhnicheskiy servis mashin 2, no. 143 (June 2021): 103–9. http://dx.doi.org/10.22314/2618-8287-2021-59-2-103-109.
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According to statistics, the share of automotive equipment accounts for up to 60 percent of harmful emissions. Gasoline engines play an important role in the pollution of the air basin. In the areas of operation of vehicles, there is an increase in the concentration of toxic substances. (Research purpose) The research purpose is in creating an effective means of cleaning exhaust gases, which has an increased resource and little impact on the power and fuel-economic indicators of the engine, and studying the processes occurring in thermal neutralizers, for their subsequent use on mobile agricultural and industrial equipment. (Materials and methods) Authors used the calculating method for the main indicators according to the method of thermal calculation of the internal combustion engine. The article identifies and analyzes the most significant processes in the device for reducing toxicity, established their relationship with temperature and the possibility of using them in optimizing the device. (Results and discussion) Authors performed calculations of heat losses in the thermal neutralizer at different thicknesses of the thermal insulation layer for different operating conditions. (Conclusions) Based on the analysis of literature sources and conducted research, it was found that tractor engines play a large role in the pollution of the air basin. The study of the features of various exhaust gas treatment systems has shown that the development of a device that combines the functions of a thermal neutralizer has become promising. According to the equations, the heat losses in the thermal neutralizer were calculated at different thicknesses of the thermal insulation layer for different operating conditions. As the calculations show, an increase in the thickness of the thermal insulation over 10 millimeters seems impractical because further reduction in heat loss occurs slightly, while increasing the size and cost of the structure.
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Helmisyah, A. J., Shahrir Abdullah, and Mariyam Jameelah Ghazali. "Effect of Thermal Barrier Coating on Piston Crown for Compressed Natural Gas with Direct Injection Engine." Applied Mechanics and Materials 52-54 (March 2011): 1830–35. http://dx.doi.org/10.4028/www.scientific.net/amm.52-54.1830.
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The top land of a piston normally known as the piston crown is an engine part that is continuously exposed to extreme temperature and pressure during combustion. For a compression ratio level, the compressed natural gas with a direct injection system (CNGDI) typically uses a range of compression ratio between gasoline and diesel engines, producing extremely high temperature and pressure which lead to high thermal stresses. Consequently, the piston crown is exposed to direct combustion due to the vertical movement of the piston, leading to various possible damages of thermal stresses. In contrast to a petrol fuelled internal combustion engine, natural gas combustion creates a dry condition in the combustion chamber, inducing cooling difficulties in the engine. Without good heat transfer, the piston crown materials will soon fail to withstand high temperature and operate effectively. Alternatively, any sort of insulation inside the combustion chamber such as applying ceramic coatings may protect the piston crown surface and affect the overall combustion process, as well as improving the engine performance and the exhaust emissions. By reducing the heat loss of a cylinder bore, a higher thermal efficiency of an engine can also be improved by applying a surface thermal insulation, namely; thermal barrier coating (TBC). Thus, in this study, a ceramic based TBC, yttria partially stabilised zirconia (YPSZ) coating was used to compare with conventional tin coated (Na2SnO3) and uncoated piston crown in terms of heat concentration. Moreover, a set of average value of combustion temperature of a CNGDI engine was selected. Detailed analyses using a finite element analysis (FEA) technique was utilised in order to determine the location of hotspots via distribution profiles of temperature. It was noted that the maximum heat flux of the uncoated piston crown was much higher than that of tin coated and YPSZ coated piston crown. Heat flux value reached about 62% of decrement due to lower conductivity levels of piston crown.
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Poubeau, Adèle, Arthur Vauvy, Florence Duffour, Jean-Marc Zaccardi, Gaetano de Paola, and Marek Abramczuk. "Modeling investigation of thermal insulation approaches for low heat rejection Diesel engines using a conjugate heat transfer model." International Journal of Engine Research 20, no. 1 (December 16, 2018): 92–104. http://dx.doi.org/10.1177/1468087418818264.
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Heat losses through combustion chamber walls are a well-known limiting factor for the overall efficiency of internal combustion engines. Thermal insulation of the walls has the potential to decrease substantially these heat losses. However, evaluating numerically the effect of coating and of its location in the combustion chamber and then design an optimized combustion system require the use of high-fidelity engine models. The objective of this article is to present the whole workflow implying the use of three-dimensional computational fluid dynamics techniques with conjugate heat transfer (CHT) models to investigate the potential benefits of a coating on a passenger car Diesel engine. First, the baseline combustion system is modeled, using CHT models to solve in a coupled simulation the heat transfers between the fluid in the intake and exhaust lines and in the combustion chamber, on one hand, and the solid piston, head and valves, on the other hand. Based on this setup, a second simulation is performed, modeling a thermo-swing insulation on all combustion chamber walls by a contact resistance, neglecting its thermal inertia to keep a manageable computational cost. Results show a decrease of 3.3% in fuel consumption with an increase in volumetric efficiency. However, decoupled one-dimensional/three-dimensional simulations highlight the inaccuracy of these results and the necessity to model the coating thermal inertia, as they show an overestimation of the heat insulation rate and, consequently, of the gain in fuel consumption (−2.1% instead of −1.6%), for a coating on the piston with no thermal inertia.
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Mar'in, Dmitriy, Il'mas Salahutdinov, Denis Molochnikov, Rail' Mustyakimov, and Ilnar Gayaziev. "RESULTS OF MOTOR TESTS OF EXPERIMENTAL GASOLINE INTERNAL COMBUSTION ENGINE." Vestnik of Kazan State Agrarian University 14, no. 4 (April 12, 2020): 64–68. http://dx.doi.org/10.12737/2073-0462-2020-64-68.
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Current trends in the engine industry are aimed at improving the power and fuel-economic indicators of an internal combustion engine (ICE). This, in turn, is accompanied by an increase in the mechanical and thermal load on the details of the cylinder-piston group (CPG). One of the most loaded parts of the CPG is the piston. Overheating of the piston leads to premature wear of rubbing surfaces, occurrence of piston rings and their breakdowns, jamming of pistons, burnouts of the piston bottom, etc. Modern technology can protect engine parts subject to thermal stresses, especially pistons, by using structural coatings or special insulating materials. The main idea of such a coating is to reflect thermal energy back into the combustion chamber, which should prevent the piston from overheating. Thermal protective coatings are applied by plasma and detonation methods, however, such coatings are destroyed during operation and therefore they are not widely used to reduce the temperature level of the piston. To improve the thermal insulation properties of the piston, it is proposed to form a heat-insulating coating on the working surfaces of the piston head by microarc oxidation (MAO). A distinctive feature of MAO is the participation in the process of covering formation of surface microdischarges that have a very significant and specific effect on the forming covering, as a result of which the composition and structure of the resulting oxidized layers are significantly different, and the properties are significantly increased compared to conventional anode films. Comparative motor tests, the results of which showed that an engine equipped with pistons with a heat-insulating coating on the working surfaces of the head, increase power by 5.3% and reduce fuel consumption by 5.7%, compared with an engine equipped with standard pistons.
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Kawamura, Hideo, Hiroshi Matsuoka, and Shinji Hara. "Construction of Heat-Insulated Engine with Large Heat-Insulation Rate." Transactions of the Japan Society of Mechanical Engineers Series B 59, no. 568 (1993): 4059–63. http://dx.doi.org/10.1299/kikaib.59.4059.
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Kawaguchi, Akio, Hiroki Iguma, Hideo Yamashita, Naoki Nishikawa, Chikanori Yamashita, Noriyuki Takada, Yoshifumi Wakisaka, and Kenji Fukui. "Engine Heat Loss Reduction by Thermo-Swing Wall Insulation Technology." Proceedings of the International symposium on diagnostics and modeling of combustion in internal combustion engines 2017.9 (2017): A207. http://dx.doi.org/10.1299/jmsesdm.2017.9.a207.
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Simons, Emerald, and Valentin Soloiu. "Reduction of Aircraft Gas Turbine Noise with New Synthetic Fuels and Sound Insulation Materials." Transportation Research Record: Journal of the Transportation Research Board 2603, no. 1 (January 2017): 50–64. http://dx.doi.org/10.3141/2603-06.
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The need to reduce the sound and vibration characteristics in the aerospace industry is continuously increasing because of the need to meet FAA regulations, to reduce noise pollution, and to improve customer satisfaction. To improve customer satisfaction, aircraft and engine manufacturers must work to control sound and vibration levels so that passengers do not experience discomfort during a flight. Sound and vibration characteristics of a fixed-wing aircraft with jet engines are composed of complex-frequency contents that challenge engineers in the development of quiet engine designs, aerodynamic bodies, and advanced sound- and vibration-attenuating materials. One of the noisiest parts of an aircraft, the gas turbine, was analyzed in this research. In Part 1 of this project, the use of alternative fuels in a gas turbine engine was investigated to determine whether those fuels have negative effects on sound and vibration levels. Three types of fuels were used: Jet A as the reference fuel, natural gas–derived S-8, and coal-derived isoparaffinic kerosene (IPK). The alternative fuels, S-8 and IPK, are Fischer–Tropsch process fuels. Overall sound and vibration characteristics of the alternative fuels presented a similar pattern across the frequency spectrum to those of the reference fuel, with the alternative fuels being slightly quieter. In Part 2, the sound path was treated by introducing sound-absorbing materials and investigating their acoustic performance. A melamine-based foam and soy-based foam were used in this research. Melamine is very lightweight, has excellent thermal endurance, and is hydrophobic. The soy-based foam was selected for its potential application in the aerospace industry to work toward a greener aircraft, in an effort to promote environmental sustainability. The soy-based material reduced the sound level by more than 20 dB(A) and presented better performance than the melamine at high frequencies.
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Jovanović, Branislav, Miloš Maljković, Dragan Stamenković, and Vladimir Popović. "Fuel savings by using better-quality insulation in refrigerated vans." Industrija 49, no. 1 (2021): 81–91. http://dx.doi.org/10.5937/industrija49-31337.
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An additional attention must be payed to the energy efficiency of refrigerated vans transporting perishable foodstuffs, because inefficient operation of refrigeration units installed on these vehicles increases fuel consumption and exhaust gases emissions. The amount of fuel consumed by mechanical refrigeration unit drive can be reduced in many ways. This paper is analysing the impact of thermal insulation quality on the fuel consumed by mechanical refrigeration unit installed on a typical van. The results of the research show that by choosing better-quality thermal insulation around € 420 can be saved annually on fuel consumed by mechanical refrigeration unit driven by vehicle's engine while transporting deeply frozen fish at -20 °C (or other foodstuffs at given temperature). If the van is transporting raw meat (for example) at 0 °C annual savings can be around € 110. When the van is used for transport of deeply frozen fish the investment will pay off after 3.5 years of vehicle exploitation, while if the raw meat is transported the investment will pay off after approximately 14 years. The analysis includes the price of insulating the van, current fuel price in Serbia, as well as the average monthly temperatures in the territory of Belgrade, Serbia.
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Moskal, Grzegorz, Jan Cwajna, Bartosz Witala, and Rafał Cygan. "Influence of Measurement Results of Thermal Conductivity and Heat Transfer Coefficients on the Simulation Results of Casting Process of Aircraft Engine Elements." Defect and Diffusion Forum 312-315 (April 2011): 566–70. http://dx.doi.org/10.4028/www.scientific.net/ddf.312-315.566.
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The paper presents results of tests concerning influence of accuracy in measurements of selected thermal properties of materials of a ceramic mould, insulating mat and an alloy itself on effects of simulation of a casting process provided for elements of an aero-engine. A simulation process was realized by means of the PROCAST program. In initial simulations, thermal parameters were applied and they are accessible in literature and concern materials of a mould and nickel superalloys. Results of simulation revealed presence of numerous defects in a form of gaps, pores and cracks. These results were proved in trial casting. In consequence, it was impossible to select correctly right casting parameters. In order to solve this problem, a value of thermal conductivity was defined experimentally and basing on it, coefficients of heat exchange in metal – mould, mould – insulation mat systems were defined as well. A value of partial coefficients of heat exchange was used to determine values of substitute coefficient of heat exchange for the whole metal – mould, mould – insulation mat systems. By introducing the got data, one managed to define parameters of a casting process, providing improvement in a level of quality of cast elements.
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Chenxi, L. I., H. U. Ying, and H. E. Liyan. "Exploration and optimization on the usage of micro-perforated panels as trim panels in commercial aircrafts." Noise Control Engineering Journal 68, no. 1 (January 20, 2020): 87–100. http://dx.doi.org/10.3397/1/37687.
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Micro-perforated panels (MPPs), as an alternative to porous materials for sound absorption, have been commonly used in electronic industries and aircraft engines but are barely used in aircraft cabins. The effect of MPPs on the sound insulation and absorption properties of aircraft cabin panels has been investigated in this article. Theoretical modeling has been conducted on an aircraft cabin panel structure with a trim panel replaced by an MPP trim panel, using the transfer matrix method and the classic MPP theory. It is indicated by the theoretical results that, although the sound transmission loss (STL) of the cabin panel with an MPP trim panel is lower than that with an un-perforated panel, the MPP trim panel can significantly enhance the sound absorption coefficient of the entire cabin panel structure. Based on the well-developed MPP theory, the sound absorption coefficient of an aircraft cabin panel with an MPP trim panel can be improved by optimizing the MPP's parameters at a specific frequency. Taking an engine frequency 273 Hz as an example, the optimization can increase the sound absorption coefficient to 1 by using the doublelayered MPPs. When the thermal acoustic insulation blanket is considered, although the STL of the proposed structure with double-layered MPP trim panels in a diffuse field is lower than those without MPP trim panels, the sound absorption in the cabin is significantly enhanced due to the double-layer MPP trim panel at the specific engine frequency and across all frequencies. The STL of the structure with double-layered MPP trim panels and TAIB can be higher than 40 dB from 880 Hz in a diffuse field, which implies its effectiveness as sound insulation structure in aviation industry. MPP trim panels provide a new idea for the design of aircraft cabin panels and areworthy of further research
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Huwae, Josua, Barokah Barokah, Marinus Tappy, Jefta Ratela, Fahriadi Pakaya, Maful Suranto, and Baihaqi Baihaqi. "EFEK KONFIGURASI BAFFLE PADA HEAT EXCHANGER TYPE SHELL AND TUBE SEBAGAI PEMANAS BAHAN BAKAR BIODIESEL B20." JURNAL BLUEFIN FISHERIES 3, no. 2 (February 5, 2022): 1. http://dx.doi.org/10.15578/jbf.v3i2.109.
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B20 is a fuel that is widely used for combustion systems in diesel engines, especially in Indonesia. Apart from having the advantages, biodiesel B20 also has various disadvantages that affect the performance of diesel engines such as those that have a higher flash point than diesel so that biodiesel is more difficult to burn and has a high viscosity which causes less good atomization of fuel and eventually causes deposits in combustion chamber. One or the solution to the problem is that it can be done carefully. The aim of this research is to make a Shell and Tube Heat Exchanger (STHE) by including the insulation in it to improve the heat exchange performance. The method applied in this research is an experiment by testing the performance of the heat exchanger using a cooling water jacket. Some of the equipment used is a diesel engine from the Mitsubishi Diesel Engine, Type 4d35, 4 cylinder, 75 HP. Data were collected at a constant rotation of 1500 rpm at no load. The results showed that the higher the cooling water temperature of the jacket, the higher the biodiesel temperature. With a cooling water jacket temperature of 83oC, it can heat biodiesel at 74.8oC. Keywords : B20 Fuel Oil; Diesel Engine; Heater; Heat Recovery; Jacket Cooler
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Asemi, Hamidreza, Sareh Daneshgar, and Rahim Zahedi. "Experimental investigation of gamma Stirling refrigerator to convert thermal to cooling energy utilizing different gases." Resources Environment and Information Engineering 4, no. 1 (2022): 200–212. http://dx.doi.org/10.25082/reie.2022.01.004.
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In recent years, combined cooling, heat and power (CCHP) systems have attracted increasing attention worldwide. Owing to their advantages of high overall thermal efficiency, fuel flexibility, low noise and vibration, and low emissions, Stirling engines, are promising candidates for micro-CCHP systems. The Stirling Cycle is one of the thermodynamic cycles that is close to Carnot cycle in term of theory, and these advantages cause to using Stirling engines in wide industries. The main objective of this research is experimental investigation of Stirling Gamma engine for refrigeration. In this investigation, effect of working fluid air and Helium, operating pressure of working fluid and dynamo power on refrigeration generation have been investigated. Results show that with using air fluid with power 520.8 Watts and operating pressure 3 bar and in 10 minutes could reach to temperature -23° Celsius and with using Helium fluid with power 420 Watts and operating pressure 6 bar and in 10 minutes could reach to temperature -21° Celsius. In experimental implement, it has been tried to reach lower than 10% error results in various part of engine like, insulation, leaking, belt lash and measurement devises. Results show that increasing power supply, mean gas pressure, power supply turning on duration and using fluids such as air, helium are effective in refrigeration. Also by using helium instead of air, the amount of cooling output and engine output power decreases while engine efficiency increases.
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Krishna, M., N. Janardhan, CH Reddy, and P. Murthy. "Experimental Investigations on DI Diesel Engine with Different Combustion Chambers Insulation." British Journal of Applied Science & Technology 6, no. 3 (January 10, 2015): 239–60. http://dx.doi.org/10.9734/bjast/2015/13865.
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Charlton, S. J., N. A. F. Campbell, W. J. J. Shephard, G. Cook, and M. J. Watts. "An Investigation of Thermal Insulation of IDI Diesel Engine Swirl Chambers." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 205, no. 4 (October 1991): 263–72. http://dx.doi.org/10.1243/pime_proc_1991_205_182_02.
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Li, Zhi Yong, Rui Bao, Jian Yu Zhang, and Bin Jun Fei. "Oxidation Study of APS Thermal Barrier Coatings in Elevated Temperatures." Advanced Materials Research 97-101 (March 2010): 1546–49. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.1546.
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TBCs is a type of multilayer systems, mainly used in the thermal parts of aero engine, acting as the part of heat insulation. The using temperature of parts can be improved because of the being of TBCs. TBCs is one of the most advanced high temperature coatings, and it has many perfectly properties, including the chemical property at high temperature, anti-erode and thermal insulation [1,2]. If TBCs spall from the base, the base will expose in the high temperature, then, rapidly destroy. TBCs generally include three layers, superalloy, bonding layer, insulation layer, and the thermally grown oxide (TGO) between the bonding layer and insulation layer. Justly because of the being of TGO, the TBCs easily failed [3,4]. Although many researchers studied the oxidation of TBCs, the investigation of the relations between oxidation and oxide temperature has not been done by far. So, the work put the emphases on the discussion of APS TBCs’ oxidation property in different temperatures by experiment.
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Asemi, Hamidreza, Sareh Daneshgar, and Rahim Zahedi. "Experimental investigation of gamma Stirling refrigerator to convert thermal to cooling energy utilizing different gases." Future Technology 2, no. 2 (May 15, 2023): 1–10. http://dx.doi.org/10.55670/fpll.futech.2.2.1.
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In recent years, combined cooling, heat, and power (CCHP) systems have attracted increasing attention worldwide. Owing to their advantages of high overall thermal efficiency, fuel flexibility, low noise and vibration, and low emissions, Stirling engines are promising candidates for micro-CCHP systems. The Stirling Cycle is one of the thermodynamic cycles that is close to the Carnot cycle in terms of theory, and these advantages cause to use of Stirling engines in wide industries. The main objective of this research is an experimental investigation of the Stirling Gamma engine for refrigeration. In this investigation, the effect of working fluid air and Helium, the operating pressure of the working fluid, and dynamo power on refrigeration generation have been investigated. Results show that using air fluid with a power of 520.8 Watts and operating pressure of 3 bar in 10 minutes could reach to the temperature of -23° Celsius and using Helium fluid with a power of 420 Watts and operating pressure of 6 bar and in 10 minutes could reach to temperature -21° Celsius. In the experimental implementation, it has been tried to reach lower than 10 % error results in various parts of the engine like insulation, leaking, belt lash, and measurement devices. Results show that increasing power supply, mean gas pressure, power supply turning on duration, and using fluids such as air and helium are effective in refrigeration. Also, by using helium instead of air, the amount of cooling output and engine output power decreases while engine efficiency increases.
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Dębska, Bernardeta, Lech Lichołai, and Jerzy Szyszka. "Innovative composite on the basis of an aerogel mat with an epoxy resin modified with PET waste and PCM." E3S Web of Conferences 44 (2018): 00031. http://dx.doi.org/10.1051/e3sconf/20184400031.
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The article presents a patent proposition of a composite – sandwich panel made of aerogel mat and a composition of encapsulated phase-change material PCM and epoxy resin modified by glycolysis based on poly(ethylene terephthalate) waste. A multifunctional thermal insulation material with a large heat capacity was obtained. This ability makes it possible to limit the temperature fluctuation in the space encased with the composite. In addition, thanks to the use of aerogel mat, which is characterized by much higher thermal insulation than commonly available materials, it is possible to achieve the assumed thermal resistance using more than two times lower thickness of insulation. The combination of aerogel and resin-PCM makes it possible to give the material virtually any shape. After the hardening process is completed, it has incomparably greater tensile, bending and compression strengths than Styrofoam and mineral wool. These features predispose it for use in situations where high thermal insulation is required while maintaining a low thickness of insulation material and a large thermal capacity of the housing material is indicated, e.g. thin divisions used in passive buildings, window joinery elements, engine compartments and cabin components in vehicles, household appliances etc.
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Liu, Shuang Hong, Kun Wang, and Bing Feng. "Relation between Appropriative Fuel Capability of Stirling Engine and Accumulated Ash." Advanced Materials Research 781-784 (September 2013): 2490–93. http://dx.doi.org/10.4028/www.scientific.net/amr.781-784.2490.
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On the base of analysis about the capabilities of appropriative fuel, forming mechanism of accumulated ash in private engine firebox and causation that hardly blown away. Result show that the forming of accumulated ash is caused by sublimation of alumina and silicon oxide because blaze center is too close to the insulation apron. Excessive transgression of alumina and aggradation is the causation that accumulated ash was hardly blown away.
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Ma, Jin Sheng, Na Na Dai, Yang Bo, Ling Zhou, Zi Feng Liu, Zhi Quan Dang, Da Min Zhuang, and Zheng Xia. "Design and Theoretical Analysis of Acoustic Enclosure for G12V190 Type Diesel Engine." Advanced Materials Research 338 (September 2011): 392–95. http://dx.doi.org/10.4028/www.scientific.net/amr.338.392.
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The existing acoustic cover is improved to reduce the noise of G12V190 type diesel engine. A panel of shutters structure is designed and simulated with SYSNOISE. The structure of acoustic enclosure is also been designed according to the structure of the diesel engine. Theoretical calculation shows that the improved insulation cover has not only a good noise reduction effect, but also has been greatly improved in terms of cooling ventilation, the field test results also shows that this section of acoustic enclosure can reduce the noise about 10dB.
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Bo, Wang, and Chen Mengjia. "Reconstruction Design of Existing Residential Buildings Based on 3D Simulation Method." Discrete Dynamics in Nature and Society 2022 (February 28, 2022): 1–11. http://dx.doi.org/10.1155/2022/8159213.
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The existing building reconstruction methods exist after three-dimensional building modeling information is not complete, and the wall insulation performance improvement effect is not obvious. Therefore, a reconstruction method of existing residential buildings based on 3D simulation is proposed. This paper analyzes the present situation of energy consumption of existing residential buildings, analyzes the fuzziness characteristic in the process of testing the thermal performance of existing residential buildings by the method of spatially distributed fusion and feature extraction, uses the fuzzy equilibrium scheduling method to decompose the fuzziness characteristic scale of the thermal performance of the thermal insulation of existing residential buildings, and optimizes the design of the thermal performance of the thermal insulation transformation of existing residential buildings. The 3D simulation software is a 3D modeling tool named 3DS Max. The real-time simulation software Unity3D engine is used to reconstruct the building scene and complete the reconstruction of existing residential buildings. The experimental results show that the information integrity of the building model reconstructed by 3D simulation technique is nearly 100%, and the insulation performance of the building wall is better.
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Lee, Je Jun, Young Shin Lee, Jae Hoon Kim, Seong Woo Byun, Song Heo Koo, and Soon Il Moon. "Thermal Strength Evaluation of the Super Alloy Structure with Various Thermal Insulation Performances by FEM and Stress-Rupture Experiment." Key Engineering Materials 353-358 (September 2007): 1064–67. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.1064.
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The combustor chamber, diffuser and nozzle are the main components of the ramjet engine. In this study, the thermal strength of the combustion chamber of the ramjet engine was evaluated. The combustion chamber consists of an Inconel alloy 718 liner and a 17-4Ph stainless steel housing. The liner is rapidly heated to a high temperature. The heated liner is cooled with a film cooling method that forms a cold boundary layer to separate the hot gas from the surface of the liner. The thermo-structural analysis is evaluated the thermal strength of super alloy structure with various thermal insulation performances by finite element method with code MSC/Nastran. The result of the analysis is compared with accelerated stress rupture test. The experiment is performed to get safety design and estimate actually life-time for combustor chamber under high temperature. In general, the work in this paper is helpful to further improve the understanding and evaluation of thermal strength of the super alloy structure with various thermal insulation performances.
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Dulskiy, Evgeny, Pavel Ivanov, Anatoliy Khudonogov, Viktor Kruchek, Alena Khamnaeva, Nikita Manuilov, and Marina Divinets. "Modeling of Infrared Radiation Drying Traction Engine Insulation by Energy Balance Equation." Transportation Research Procedia 54 (2021): 436–44. http://dx.doi.org/10.1016/j.trpro.2021.02.093.
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Mohd Nor, Alias, Muhammad Rabiu Abbas, Srithar Rajoo, Muhammad Hanafi Md Sah, and Norhayati Ahmad. "Review on Ceramic Application in Automotive Turbocharged Engines." Applied Mechanics and Materials 660 (October 2014): 219–28. http://dx.doi.org/10.4028/www.scientific.net/amm.660.219.
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Research on the use of thermal barrier coatings in internal combustion engine had contributed in achieving higher thermal efficiency, improved combustion and reduced emissions of the engine. Low thermal conductivity ceramics can be used to control the temperature distribution and heat flow in high temperature structural components due to its inherent thermal insulation properties. For this reason much has been and is being done on the study and development of ceramics for use in automotive engine components working under severe temperature conditions and heavy loads due to their inherent thermal and mechanical properties. The objective of the study is to review the contributions of structural ceramics in the development and improvement of some of the major automotive engine components working under severe conditions of temperature. It is expected that the study will serve as a useful guide for the selection of materials which can withstand severe conditions of temperature and heavy loads for a novel turbocharger and turbocharged engine applications.
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Merzlikin, V. G., T. V. Zhubreva, and A. V. Kostukov. "Modeling of the Structure of Heat-Insulating Semi-Transparent Materials and Coatings for Industrial and Transport Power Plants." Solid State Phenomena 284 (October 2018): 1215–20. http://dx.doi.org/10.4028/www.scientific.net/ssp.284.1215.
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The influence of optical characteristics of semitransparent thermal barrier coatings (TBC) on thermal regulation of heat-stressed elements of power plants is studied. There was used the developed by the authors methodology of physical and mathematical simulation of thermoradiational (in the range 1-2 μm) and conductive heat transmission in ceramic thermal insulation of chamber combustion inner walls of a diesel engine. The paper discusses temporal temperature regimes in model two-layer TBC-coatings in the form of a selectively scattering and absorbing (in the near infrared range) ceramic heat-insulating layer, deposited on the bonding sublayer (with boundary reflection) of the internal surface of the combustion chamber of Low Heat Rejection diesel. Spectrophotometric measurements of the optical parameters have ensured estimates of optical and thermal fields of the investigated ceramics, the structural composition of which was determined on the basis of ZrO2+8%Y2O3. For typical values of radiant-convective flux up to 1-2 MW/m2 (effecting on heat-stressed elements of heat-insulated combustion chamber of a diesel engine in pulse-periodic regime) optical and structural parameters TBC-coatings that ensure control and superintendence of the ceramic layer surface temperature and its temperature gradient were proposed.
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Myers, Phillip S. "Ceramics for Transportation Engines—Siren or Solution." Applied Mechanics Reviews 42, no. 3 (March 1, 1989): 53–69. http://dx.doi.org/10.1115/1.3152421.
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The major challenges facing transportation engines—shrinking resources, preserving the environment, and competition—are reviewed and the promise of new materials, specifically ceramics, in helping to meet these challenges is discussed. As a background for understanding the properties of materials, the structure of materials (first at the subatomic level, then the molecular level, and finally at the mircostructure level) is reviewed. The relationship of this structure to properties of ceramics judged to be of importance to engines is then presented. The effect of these properties on engine performance such as volumetric efficiency, fuel economy, heat rejection, inertia, friction, wear, fuel tolerance, and packaging are discussed. It is concluded that ceramics have special properties that, for selected applications, are already justifying their use in transportation engines. It is further concluded that these special application uses will continue to grow and precede general use of ceramics for in-cylinder insulation aimed at improving fuel economy.
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Hay, N., P. M. Watt, M. J. Ormerod, G. P. Burnett, P. W. Beesley, and B. A. French. "Design Study for a Low Heat Loss Version of the Dover Engine." Proceedings of the Institution of Mechanical Engineers, Part D: Transport Engineering 200, no. 1 (January 1986): 53–60. http://dx.doi.org/10.1243/pime_proc_1986_200_163_02.
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The paper describes an analytical and hardware design study aimed at evolving a low heat loss version of a current turbocharged production diesel engine, the Ford Dover engine. The analytical approach was done using the Ford engine simulation program and aimed to establish whether reduction in heat loss would be advantageous for this particular engine. Various levels of insulation were assumed on the piston crown, the cylinder head and the cylinder liner, and the effect on power output and fuel economy was assessed. It was found that reduced heat loss could be implemented without any major design changes and would result in benefits in both power output and fuel economy. New pistons and alterations to the combustion space were then evolved and specified in detail to bring about the desired reduction in heat loss. Thermal analysis of these designs using finite element and other approaches confirmed their suitability. The paper describes the approach, the various stages in the development of the designs, their assessment, and the predicted performance of the proposed low heat loss Dover engine.
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Zhu, Dongming, and Robert A. Miller. "Thermal-Barrier Coatings for Advanced Gas-Turbine Engines." MRS Bulletin 25, no. 7 (July 2000): 43–47. http://dx.doi.org/10.1557/mrs2000.123.
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Ceramic thermal-barrier coatings (TBCs) have received increasing attention for gasturbine engine applications. The advantages of using TBCs include increased fuel efficiency by allowing higher gas temperatures and improved durability and reliability from lower component temperatures. As illustrated in Figure 1, TBCs can provide effective heat insulation to engine components, thus allowing higher operating temperatures and reduced cooling requirements. Atypical two-layer TBC system consists of a porous ZrO2-Y2O3 ceramic top coat and an oxidation-resistant metallic bond coat. These TBC systems can be applied to the metal substrate either by plasma spray or by electron-beam physical vapor deposition (EB-PVD) techniques.
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Li, Yao Ming, and Pan Sun. "A Study on Noise Test and Control of Combine Harvester." Advanced Materials Research 971-973 (June 2014): 324–28. http://dx.doi.org/10.4028/www.scientific.net/amr.971-973.324.
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Faced at the present situation that the noise level of most combine harvesters was generally higher than the national standard limit in our country, experiments carried out to reduce the driver's ear noise, which chosen 4LZ-5.0E type tracked combine harvester as experimental prototype. The method of noise sources separation was used to test the whole machine on different working conditions. Based on the contribution analysis to obtain the contribution of main working parts for the driver's ear noise and identify the main noise sources. Through designing the reasonable structure of sound insulation for engine and installing the sound insulation plate on the left of driver, testing results showed that the noise of the driver's ear was reduced 3.1dB (A).
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Каргин, Сергей Александрович, Sergey Aleksandrovich Kargin, Александр Дорохов, and Aleksandr Dorokhov. "Increasing energy efficiency and environmental safety of reciprocating engines." Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies 2019, no. 4 (November 15, 2019): 60–70. http://dx.doi.org/10.24143/2073-1574-2019-4-60-70.
Full textAbstract:
The article highlights the process of organizing the internal combustion engines operation, which is intended to raise the environmental safety and the extent to which the thermal energy of the working fluid is used in order to increase the energy efficiency and environmental safety of marine, fixed and transport engines. Today in propulsion engineering the process of supplying heat to the cycle (fuel injection, mixture formation, combustion) has been comprehensively studied and improved. The analysis of the thermodynamic cycle has been presented. Disadvantages of the working process (from the position of converting the chemical energy of fuel into mechanical ener-gy) of a reciprocating engine with a crank mechanism are listed: incomplete combustion of fuel, loss of heat with exhaust gases and coolant, mechanical losses in the engine, etc. It has been found that the complete conversion of the thermal energy of the working fluid into mechanical work is impossible due to a short expansion stroke. The possibilities of increasing the efficiency of the working cycle of internal combustion engines are considered. An additional increase of the internal energy of the working fluid obtained by reducing losses in the cooling system due to the thermal insulation of the cylinder goes into increased losses with exhaust gases. It is proposed to introduce water into the cylinder after reaching the maximum temperature of the cycle, which helps lower the temperature of the gases, reduce the temperature difference and the intensity of heat transfer. It has been suggested to conduct tests with different moments of water supply, which will determine the effect of water on the process of burning fuel. The necessity of calculating various situations has been justified, since the amount of water will be different. The calculated water injection at the end of the combustion process can simplify cleaning and increase the engine capacity without significant amplifications of its main elements.
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Khakimov, Ramil, Otari Didmanidze, and Ekaterina Parlyuk. "Improving the Supply System Gas Engine to Improve Energy Efficiency." MATEC Web of Conferences 334 (2021): 02016. http://dx.doi.org/10.1051/matecconf/202133402016.
Full textAbstract:
The paper presents the main advantages and disadvantages of standard fuels in comparison with alternative fuels of methane series used in internal combustion engines. Particular attention in the article is given to the study of the heat transfer parameters of the calculated volume in the fuel tank filled with liquefied methane with thermal insulation, as well as methane outflow in special round tubes to transport gas in the liquid phase to the atomizer of the gas injector. Variants of numerical modeling of phase transitions of the heterogeneous system inside the tank are presented, as the calculated volume and flow of a two-phase flow of liquefied methane in tubes in the horizontal plane, taking into account the operating parameters of the elements of the fuel supply system.