Готові списки джерел за темами / Combustion devices

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Автор: Grafiati
Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Combustion devices"

1

Yuan, Yi Xiang, Peng Fu Xie, Wen Yu Cao, Cong Chen, Chao Yu, De Jun Zhan, and Chun Qing Tan. "A Preliminary Study on Lean Blowout of One Combustion Stability Device." Advanced Materials Research 732-733 (August 2013): 63–66. http://dx.doi.org/10.4028/www.scientific.net/amr.732-733.63.

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Анотація:
The lean blowout experiments of the combustion stability device A (multi-vortexes-dome combustor model) have been carried out at atmospheric pressure. In contrast with the experimental data of device B, and the result shows that the lean blowout performance of the device A is superior to the device B at low operating condition. Furthermore, both the devices A and B were modeled, and the combustion numerical simulations were performed with the steady Flamelet model of non-premixed combustion and the simplified mechanism of methane-air reaction with 14 species and 26 step elementary reactions. The numerical results are in agreement with the experimental phenomena.
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2

Zhou, Jun, Peter Zotter, Emily A. Bruns, Giulia Stefenelli, Deepika Bhattu, Samuel Brown, Amelie Bertrand, et al. "Particle-bound reactive oxygen species (PB-ROS) emissions and formation pathways in residential wood smoke under different combustion and aging conditions." Atmospheric Chemistry and Physics 18, no. 10 (May 18, 2018): 6985–7000. http://dx.doi.org/10.5194/acp-18-6985-2018.

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Abstract. Wood combustion emissions can induce oxidative stress in the human respiratory tract by reactive oxygen species (ROS) in the aerosol particles, which are emitted either directly or formed through oxidation in the atmosphere. To improve our understanding of the particle-bound ROS (PB-ROS) generation potential of wood combustion emissions, a suite of smog chamber (SC) and potential aerosol mass (PAM) chamber experiments were conducted under well-determined conditions for different combustion devices and technologies, different fuel types, operation methods, combustion regimes, combustion phases, and aging conditions. The PB-ROS content and the chemical properties of the aerosols were quantified by a novel ROS analyzer using the DCFH (2′,7′-dichlorofluorescin) assay and a high-resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS). For all eight combustion devices tested, primary PB-ROS concentrations substantially increased upon aging. The level of primary and aged PB-ROS emission factors (EFROS) were dominated by the combustion device (within different combustion technologies) and to a greater extent by the combustion regimes: the variability within one device was much higher than the variability of EFROS from different devices. Aged EFROS under bad combustion conditions were ∼ 2–80 times higher than under optimum combustion conditions. EFROS from automatically operated combustion devices were on average 1 order of magnitude lower than those from manually operated devices, which indicates that automatic combustion devices operated at optimum conditions to achieve near-complete combustion should be employed to minimize PB-ROS emissions. The use of an electrostatic precipitator decreased the primary and aged ROS emissions by a factor of ∼ 1.5 which is however still within the burn-to-burn variability. The parameters controlling the PB-ROS formation in secondary organic aerosol were investigated by employing a regression model, including the fractions of the mass-to-charge ratios m∕z 44 and 43 in secondary organic aerosol (SOA; f44−SOA and f43−SOA), the OH exposure, and the total organic aerosol mass. The regression model results of the SC and PAM chamber aging experiments indicate that the PB-ROS content in SOA seems to increase with the SOA oxidation state, which initially increases with OH exposure and decreases with the additional partitioning of semi-volatile components with lower PB-ROS content at higher OA concentrations, while further aging seems to result in a decay of PB-ROS. The results and the special data analysis methods deployed in this study could provide a model for PB-ROS analysis of further wood or other combustion studies investigating different combustion conditions and aging methods.
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3

Nair, Vineeth, and R. I. Sujith. "Multifractality in combustion noise: predicting an impending combustion instability." Journal of Fluid Mechanics 747 (April 23, 2014): 635–55. http://dx.doi.org/10.1017/jfm.2014.171.

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AbstractThe transition in dynamics from low-amplitude, aperiodic, combustion noise to high-amplitude, periodic, combustion instability in confined, combustion environments was studied experimentally in a laboratory-scale combustor with two different flameholding devices in a turbulent flow field. We show that the low-amplitude, irregular pressure fluctuations acquired during stable regimes, termed ‘combustion noise’, display scale invariance and have a multifractal signature that disappears at the onset of combustion instability. Traditional analysis often treats combustion noise and combustion instability as acoustic problems wherein the irregular fluctuations observed in experiments are often considered as a stochastic background to the dynamics. We demonstrate that the irregular fluctuations contain useful information of prognostic value by defining representative measures such as Hurst exponents that can act as early warning signals to impending instability in fielded combustors.
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4

Abdul Rahman, Mohd Rosdzimin, Wan Mohd Amin Wan Shuib, Mohd Rashdan Saad, Azam Che Idris, and Hasan Mohd Faizal. "Combustion Characteristic inside Micro Channel Combustor." Jurnal Kejuruteraan si4, no. 1 (September 30, 2021): 109–16. http://dx.doi.org/10.17576/jkukm-2021-si4(1)-14.

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Анотація:
Small-scale electronic devices require long hours’ operation and fast charging time. Potential technology to support requirement of small-scale electronic device is micro scale combustor. Unfortunately, micro scale combustion is prone to combustion instability. Therefore, objective of this study is to investigate the combustion characteristics, mechanism that stabilize the flame and combustor performance of the 2-D microchannel combustor with bluff body having various slit percentages gap. Two-dimensional computational domain with the height and length of the channel H = 1 mm and L = 16 mm is used respectively. The height of the bluff body is 0.5 mm and located at 2 mm from the inlet. The slit gap percentage varied in this study is 0% to 70%. The results show that the combustion characteristic such as stable flame, wavy flame, blow-off, and flame split into two parts is significantly influenced by the slit gap percentage. Flame is moving downstream and blow-off at the slit percentage of 10% to 25%. At the slit percentage of 30%, the flame zone moves towards the upstream due to the secondary vortex that exists behind the bluff body as slit gap increases and pushes the flame upstream. The reaction zone is split into two parts at 60% and 70% slit gap percentage. It is due to the incoming fresh mixture of CH4/air mixture flows through the slit and cuts the flame zone. It is also found that by increasing inlet velocity beyond 2.0 m/s, the flame becomes unstable and leads to blow-off as increase in equivalence ratio up to 1.0.
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5

Duan, Run Ze, Zhi Ying Chen, and Li Jun Yang. "Modeling and Simulation of Combustion Chamber." Applied Mechanics and Materials 513-517 (February 2014): 3543–47. http://dx.doi.org/10.4028/www.scientific.net/amm.513-517.3543.

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The work process of oil fuel burner consists of atomization and combustion of oil. In this process, different atomization and air-distribution methods would affect the quality of combustion and then bring out problems of life-span of the burner, energy efficiency and environmental pollution. Therefore, in this paper, different air distribution devices and different sizes of nozzles are designed, and the numerical simulation software, Fluent 6.3, was employed to simulate the flow field of different conditions in combustor,. Through the simulation, the best work condition was achieved, which could help to provide optimization design parameters of the combustor.
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6

Stollmann, V., Yu R. Nikitin, and A. O. Shoshin. "RELAZ Devices." Vestnik IzhGTU imeni M.T. Kalashnikova 25, no. 2 (June 28, 2022): 79–88. http://dx.doi.org/10.22213/2413-1172-2022-2-79-88.

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The biggest energy resource on our world is the sun. Its energy is conserved literally everywhere, for example on wind or in wood. In this paper, we deal with one of the less known sun energy form. This new alternative and renewable energy resource was called “mountain energy”, because it is kept by trees growing in mountain ranges. The new energetic subsystem concept was designed to use this energy for empowering machines. Devices created in relation to this new conception was called “RELAZ devices” (Recuperative Cable Devices). Technical description of these hybrid devices is in the second focus part of this paper. RELAZ devices were initially designed for foresters working in mountain ranges. Principles used in RELAZ devices construction allows us to use them in working machines with combustion engines in common. RELAZ devices are hybrid devices. They are equipped with an internal combustion engine that only serves to charge a powerful energy battery. The charging process is carried out at the nominal speed of the internal combustion engine, which allows to reduce fuel consumption by 3-4 times. Therefore, RELAZ devices can be used profitably not only in mountainous areas, but also on the plain. The optimal mode of operation of RELAZ devices , which has a wider range than the classic machines, has been found. The specific energy of the RELAZ devices are less than that of the classic machines. It has been found that the use of a RELAZ cable car on the W30 forest cable car produced in Switzerland can save 780 litres per year of diesel fuel, which is 64 % of the savings. The results confirm the prospects and competitiveness of the RELAZ devices.
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7

Spadaccini, C. M., A. Mehra, J. Lee, X. Zhang, S. Lukachko, and I. A. Waitz. "High Power Density Silicon Combustion Systems for Micro Gas Turbine Engines." Journal of Engineering for Gas Turbines and Power 125, no. 3 (July 1, 2003): 709–19. http://dx.doi.org/10.1115/1.1586312.

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As part of an effort to develop a microscale gas turbine engine for power generation and micropropulsion applications, this paper presents the design, fabrication, experimental testing, and modeling of the combustion system. Two radial inflow combustor designs were examined; a single-zone arrangement and a primary and dilution-zone configuration. Both combustors were micromachined from silicon using deep reactive ion etching (DRIE) and aligned fusion wafer bonding. Hydrogen-air and hydrocarbon-air combustion were stabilized in both devices, each with chamber volumes of 191mm3. Exit gas temperatures as high as 1800 K and power densities in excess of 1100MW/m3 were achieved. For the same equivalence ratio and overall efficiency, the dual-zone combustor reached power densities nearly double that of the single-zone design. Because diagnostics in microscale devices are often highly intrusive, numerical simulations were used to gain insight into the fluid and combustion physics. Unlike large-scale combustors, the performance of the microcombustors was found to be more severely limited by heat transfer and chemical kinetics constraints. Important design trades are identified and recommendations for microcombustor design are presented.
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8

Sinitsyn, Anton A. "Study of Operation of Power-Generating Devices of Gaseous Fuels Combustion." Applied Mechanics and Materials 725-726 (January 2015): 1417–22. http://dx.doi.org/10.4028/www.scientific.net/amm.725-726.1417.

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Анотація:
The paper identifies the relevance of research on the effectiveness of fire-technical processes in energy devices (boilers, furnaces and internal combustion engines, etc.) in order to optimize them and improve their reliability. The survey revealed the closeness of calculation methods for such devices. The development of engineering methodology of design and verification calculations is necessary for the further development of vibration combustion machines production industry. The author identifies the main problems of formation of calculating methodology for energy devices operating on the basis of vibration combustion. To determine the frequency of the impulse response of these devices the author proposes a mathematical model and the description of the process of the thermodynamic fluctuations in the combustion chamber, allowing to determine the reliability and efficiency of these devices for different purposes based on the principle of self-oscillating combustion of fuel at the design stage.
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9

Krpec, Kamil, Jiří Horák, Lubomír Martiník, Petr Kubesa, František Hopan, Zdeněk Kysučan, Jiří Kremer, and Zuzana Jankovská. "Potential Utilization of Catalyst for the Combustion of Wood in Households." Advanced Materials Research 911 (March 2014): 388–92. http://dx.doi.org/10.4028/www.scientific.net/amr.911.388.

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The application of stricter requirements on combustion devices is placing more pressure especially on the manufacturers of such devices. They can improve the emission parameters of their products e.g. by primary technical measures (modification of combustion air supply, modification of combustion chamber, introduction of a final combustion chamber, etc.) or by secondary technical measures, e.g. introduction of a catalyst into the exhaust route.
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10

Biryukov, A. B., and Ya S. Vlasov. "Analysis of modern trends in recuperative burners perfection." Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information 75, no. 8 (September 6, 2019): 971–78. http://dx.doi.org/10.32339/0135-5910-2019-8-971-978.

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Анотація:
At present, recuperative burners are becoming more extended in the gas-heated facilities, thanks to their significant advantages comparing with conventional gas-burning devices. However, the wide application of the recuperative burners is restricted by their high price. Therefore, studies for perfection recuperative burner designs and technologies of aggregates heating with the burners application are very actual. Results of analysis of modern ways of the burners designs and methods of their application presented, including diagnostics of the recuperative burner heat-exchanging surface state, optimization of the heat-exchanging surface and others. Items of ribbing rational parameters selection for imbedded recuperative devices considered. Perfection of the preliminary combustion chambers and air distribution by combustion stages are important ways of the recuperative burner perfection. It was noted, that in addition to traditional two-stage combustion systems, three-stage combustion systems are appeared lately. It was showed, that under unfavorable conditions of a furnace running, a significant contamination of the recuperative device surface can take place earlier comparing with the set regulation time of periodical cleaning, resulting in losses related to increase of fuel consumption. From the other side, unjustified decrease of the furnace operation period between the recuperative device surfaces cleaning is inconvenient in organization. A methodology of operative diagnostic of a recuperative device state elaborated, due to which the estimation of the imbedded recuperative device heat-exchanging surface state can be done by the identification of the current values of recuperation coefficient and their comparing with the standard values. The methodology enables regulating the periods of cleaning of the surfaces of both the central recuperative devices and recuperative burners.
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Дисертації з теми "Combustion devices"

1

Mamani, A., G. Quispe, and C. Raymundo-Ibañeez. "Electromechanical Device for Temperature Control of Internal Combustion Engines." IOP Publishing Ltd, 2019. http://hdl.handle.net/10757/656303.

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Internal combustion engines are the most commonly used engines in the automotive world. However, these engines lack an overheating prevention system against cooling system failures when they exceed their normal operating temperature. Less experienced drivers (users) usually do not notice overheating until the engine stops, generating economic expenses in engine repairs. As such, this paper describes the design and construction of an electromechanical device to prevent engine overheating. This device is installed in a vehicle and operates independently from the electronic control unit (ECU); it records the coolant temperature and controls air admission to the engine of the vehicle in which it is installed. In addition, a new Arduino-based card will receive signals from a temperature sensor as input and process them according to its programming. Then, it will send signal outputs to the actuators: A servomotor, monitor, LED display, and buzzer. To control the intake flow, a butterfly valve is used with the servomotor. This valve partially or totally restricts the engine airflow, based on the temperature programmed for the Arduino, thus protecting the engine from overheating.
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2

Douasbin, Quentin. "Acoustic waves in combustion devices : interactions with flames and boundary conditions." Phd thesis, Toulouse, INPT, 2018. http://oatao.univ-toulouse.fr/20204/7/douasbin_quentin.pdf.

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Combustion devices are prone to combustion instabilities. They arise from a constructive coupling between the unsteady heat release rate of the flame and the resonant acoustic modes of the entire system. The occurence of such instabilities can pose a threat to both performance and integrity of combustion systems. Although these phenomena have been known for more than a century, avoiding their appearance in industrial engines is still challenging. The objective of this thesis is threefold: (1) study the dynamics of the resonant acoustic modes, (2) investigate the flame response of a liquid rocket engine under unstable conditions using Large Eddy Simulation(LES) and (3) derive, use and study Time Domain Impedance Boundary Conditions (TDIBCs), i.e. boundary conditions modeling complex acoustic impedances.
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3

Junior, Avandelino Santana. "Investigation of passive control devices to suppress acoustic instability in combustion chambers." Instituto Tecnológico de Aeronáutica, 2008. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=590.

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Combustion instability problems have been experienced during nearly every rocket engine development program, characterized by chamber pressure oscillations and high density of energy release in a volume having relatively low losses. Several distinct types of instability and their physical manifestations have been observed, although the frequency and amplitude of these oscillations and their external manifestations normally vary with the type of instability. The most destructive type of instability is referred to as high frequency instability, resonant combustion or acoustic instability, which is usually eliminated by use of passive control, involving installation of baffles, resonators, or some other modification of geometry. The main purpose of this work is the experimental investigation of use of passive control devices (Helmholtz resonators and baffles) to control acoustic instabilities in combustion chambers, because this type of instability occurs in liquid rocket engines, rocket motors and industrial burners. The first step of this research is the acoustic characterization of chamber, thus cold tests were carried out on full-scale chamber model to analyze the effects of resonators. Experimental frequency spectrum data are in excellent agreement with resonant frequencies and damping rate calculated by theoretical model, demonstrating resonators efficiency to reduce the amplitude of Sound Pressure Level at given resonant frequency. Afterwards, hot tests were carried out on burner with and without resonators, identifying the frequency spectrum of acoustic pressure in chamber, which was compared with cold tests (full-scale model) results and theory by correction factors of temperature, density, and viscosity. The experimental data validated the methodology to design resonators useable to control combustion instabilities.
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4

Schöning, Christoph. "Virtual prototyping and optimisation of microwave ignition devices for the internal combustion engine." Thesis, University of Glasgow, 2014. http://theses.gla.ac.uk/5487/.

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The internal combustion engine (ICE) has been used in automotive vehicles without any significant improvement in energy efficiency for over a hundred years. There are several possibilities for developing a ‘greener’ and more powerful engine such as the homogeneous charge microwave ignition (HCMI) system. In this thesis, the HCMI system is analysed and investigated through simulation based ‘virtual prototyping’ in combination with an intelligent optimisation and a Computer-Automated Design (CAutoD) framework. The intention is to analyse and develop designs which could be used to transform the existing ICE ignition system to the HCMI system with minimal modifications to the existing engine. With the help of the finite element method (FEM), the microwave induced electromagnetic field in the engine cylinder is first simulated for `virtual prototyping' using a computer model. This then takes the prototyping methodology one step further, by replacing the process of human tuning of the prototypes with a computer-automated search process using computational intelligence. To realise this, an interface between the FEM model and the CAutoD framework is designed using the Application Programming Interface (API) of the FEM simulation software. This connection facilitates a rapid exchange of data between the simulation model and the search algorithm. Thus, rendering it possible to accommodate a wider exploration or a higher simulation resolution for superior and more accurate prototyping. Another contribution of this thesis is the improvement of the search performance, including the combination of deterministic and non-deterministic search algorithm as well as using a new technique to solve optimisation problems without using the frequency as an input variable. The knowledge gained from the analysis of nature-inspired algorithms is used to perform a pre-evaluation and hence to provide a population which guides a non-deterministic search towards potentially optimal directions for the global maximum. A CAutoD system is then developed to optimise digital prototyping on various aspects of the ignition device for the HCMI system. This helps deepen the understanding of relationships between the characteristic outputs of a design, and the input parameters that affect the performance of the device. The CAutoD system is first applied to a basic cylinder model, with one single antenna in the middle, to analyse the single variable changes for the antenna designs. It is discovered that the inner antenna length has a significant impact on the maximum electric field intensity inside the engine cylinder. Then it is applied to the design process involving multiple variable changes for the global optimum electromagnetic performance. The results are presented in multi-dimensional graphs, which illustrate the relevant relationships between the different input variables. For example, it is revealed that the resonance frequency is affected more by the piston position than by the antenna length, which underlines the importance of the correct and exact timing advance and control of the ignition event. Subsequent to the extensive and systematic analysis of different antenna designs and input variables, Computer-Automated Design (CAutoD) has been applied to various designs to expand the understanding and virtual prototyping of the HCMI system. The criterion for the best design is to first provide the highest possible electromagnetic propagation performance within the cylindrical cavity by using the lowest microwave input power. With this, the reection of the microwave energy from the cylinder back to the microwave source, under the geometric conditions of the cylinder and antenna model, will also be minimised. During the search process, the default antenna model was extended with an additional antenna, which leads to a dramatic decrease in the field, once the additional antenna is introduced. This determines, that any antenna at the outer shield of the coaxial cable and inside the cylinder head, interferes with the electromagnetic propagation inside the cavity and lowers the propagation performance. The results show that this field will break down the air-fuel mixture inside the cylinder because the field strength is comparable to that, created by a spark plug. Hence, a HCMI system can be designed to replace a spark ignition system without requiring physical modifications to the engine cylinder.
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5

Rajendar, Ashok. "Internal flow effects on performance of combustion powered actuators." Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42901.

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Earlier investigations of Combustion Powered Actuation (COMPACT) have demonstrated its utility for high-speed aerodynamic flow control. In this actuation approach, momentary (pulsed) actuation jets are produced by the ignition of a mixture of gaseous fuel and oxidizer within a cubic-centimeter scale chamber. The combustion process yields a high pressure burst and the ejection of a high-speed exhaust jet. The present thesis focuses on characterization of the effects of the internal flow (which is altered through the fuel and oxidizer inlet streams) on mixing and flame propagation within the actuator's combustion chamber, and thereby on actuator operation and performance. A test chamber with a grid of interchangeable air and fuel inlets was used for parametric investigations of the effects of inlet size and location. Actuator performance is characterized using dynamic pressure measurements and phase-locked Particle Image Velocimetry (PIV) of the combustor's internal flow field in the presence and absence of the active combustion process. Over the range tested, increased momentum of the air inlet jet for a given flow rate improves the actuator performance by increasing bulk velocities and small-scale motions within the chamber, thus yielding net higher flame propagation speed and subsequently faster pressure rise and higher pressure peak. Variation in inlet location that results in swirling flow within the chamber yields higher internal pressures while air flow over the spark ignition site yields lower internal pressures and erratic combustion. Improved refill and combustion processes will lead to enhanced performance combustor designs.
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Melendez-Cervantes, Carlos. "On the use of sound transmission in the measurement of temperature in combustion devices." Thesis, University of Sheffield, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341842.

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7

Elsari, Mohamed Elhadi. "The use of passive devices for the suppression of combustion oscillations in gas-fired appliances." Thesis, University of Hull, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.440658.

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8

Warta, Brett James. "Characterization of High Momentum Flux Combustion Powered Fluidic Actuators for High Speed Flow Control." Thesis, Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19873.

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Анотація:
The performance of a high-power small-scale combustion-based fluidic actuator for high-speed flow control applications is characterized with specific focus on comparisons between premixed and nonpremixed operating modes for the device. Momentary (pulsed) actuation jets are produced by the ignition of a mixture of gaseous fuel and oxidizer within a small (cubic centimeter scale) combustion chamber. The combustion process yields a high pressure burst (1 to 3 ms in duration in the typical configurations) and the ejection of a high-speed exhaust jet. The actuation frequency can be continuously varied by independently controlling the flow rate of the fuel/oxidizer and the spark ignition frequency up to a maximum determined by the operating characteristics of the actuator. The actuator performance is characterized by both its peak thrust and net total impulse, with increases in peak jet momentum often two to three orders of magnitude above the baseline steady jet. Results for operation of the device in both premixed and nonpremixed modes are presented and analyzed, with nonpremixed operation typically yielding higher pressures and greater frequency ranges in the present configurations.
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9

Wijewardane, M. Anusha. "Exhaust system energy management of internal combustion engines." Thesis, Loughborough University, 2012. https://dspace.lboro.ac.uk/2134/9829.

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Анотація:
Today, the investigation of fuel economy improvements in internal combustion engines (ICEs) has become the most significant research interest among the automobile manufacturers and researchers. The scarcity of natural resources, progressively increasing oil prices, carbon dioxide taxation and stringent emission regulations all make fuel economy research relevant and compelling. The enhancement of engine performance solely using incylinder techniques is proving increasingly difficult and as a consequence the concept of exhaust energy recovery has emerged as an area of considerable interest. Three main energy recovery systems have been identified that are at various stages of investigation. Vapour power bottoming cycles and turbo-compounding devices have already been applied in commercially available marine engines and automobiles. Although the fuel economy benefits are substantial, system design implications have limited their adaptation due to the additional components and the complexity of the resulting system. In this context, thermo-electric (TE) generation systems, though still in their infancy for vehicle applications have been identified as attractive, promising and solid state candidates of low complexity. The performance of these devices is limited to the relative infancy of materials investigations and module architectures. There is great potential to be explored. The initial modelling work reported in this study shows that with current materials and construction technology, thermo-electric devices could be produced to displace the alternator of the light duty vehicles, providing the fuel economy benefits of 3.9%-4.7% for passenger cars and 7.4% for passenger buses. More efficient thermo-electric materials could increase the fuel economy significantly resulting in a substantially improved business case. The dynamic behaviour of the thermo-electric generator (TEG) applied in both, main exhaust gas stream and exhaust gas recirculation (EGR) path of light duty and heavy duty engines were studied through a series of experimental and modelling programs. The analyses of the thermo-electric generation systems have highlighted the need for advanced heat exchanger design as well as the improved materials to enhance the performance of these systems. These research requirements led to the need for a systems evaluation technique typified by hardware-in-the-loop (HIL) testing method to evaluate heat exchange and materials options. HIL methods have been used during this study to estimate both the output power and the exhaust back pressure created by the device. The work has established the feasibility of a new approach to heat exchange devices for thermo-electric systems. Based on design projections and the predicted performance of new materials, the potential to match the performance of established heat recovery methods has been demonstrated.
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10

Avdić, Amer [Verfasser]. "Development and Application of Numerical Methods for the Simulation of Advanced Combustion Processes within Complex Devices / Amer Avdic." Aachen : Shaker, 2015. http://d-nb.info/1067734716/34.

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Книги з теми "Combustion devices"

1

Center for Environmental Research Information (U.S.), ed. Operational parameters for hazardous waste combustion devices. Cincinnati, Ohio: Center for Environmental Research Information, Office of Research and Development, U.S. Environmental Protection Agency, 1994.

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2

Center for Environmental Research Information (U.S.), ed. Operational parameters for hazardous waste combustion devices. Cincinnati, Ohio: Center for Environmental Research Information, Office of Research and Development, U.S. Environmental Protection Agency, 1994.

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3

P, Mercer Stewart, and United States. National Aeronautics and Space Administration., eds. ALS rocket engine combustion devices: Design and demonstration. Sacramento, CA: Aerojet TechSystems, 1989.

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4

Gurstelle, William. The practical pyromaniac: Build fire tornadoes, one-candlepower engines, great balls of fire, and more incendiary devices. Chicago: Chicago Review Press, 2011.

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5

Engineers, Society of Automotive, and International Fall Fuels & Lubricants Meeting & Exposition (1996 : San Antonio, Tex.), eds. Diesel engine combustion and emission control. Warrendale, PA: Society of Automotive Engineers, 1996.

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6

Engineers, Society of Automotive, ed. Reducing emissions from diesel combustion. Warrendale, PA: Society of Automotive Engineers, 1992.

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7

SAE Gasketing Standards Committee., ed. Additional guidelines for internal combustion engine gaskets--liquid sealing. Warrendale, PA: Society of Autmotive Engineers, 1993.

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8

Energy-Sources Technology Conference and Exhibition (1989 Houston, Tex.). Advances in engine emissions control technology. New York, N.Y. (345 E. 47th St., New York 10017): American Society of Mechanical Engineers, 1988.

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9

Energy-Sources Technology Conference and Exhibition (12th 1989 Houston, Tex.). Advances in engineemissions control technology. New York, N.Y: American Society of Mechanical Engineers, 1988.

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10

Bighouse, Roger D. Evaluation of emissions and energy efficiencies of residential wood combustion devices using manufactured fuels. Salem, OR: Oregon Dept. of Energy, 1993.

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Частини книг з теми "Combustion devices"

1

Fraenkel, Peter, and Jeremy Thake. "9. Internal combustion engines." In Water Lifting Devices, 191–243. Rugby, Warwickshire United Kingdom: Practical Action Publishing, 2006. http://dx.doi.org/10.3362/9781780446370.009.

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2

Brown, Andrew M. "Structural Dynamics of LRE Combustion Devices." In Synthesis Lectures on Mechanical Engineering, 115–30. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-18207-5_4.

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3

Rubtsov, Nickolai, Mikhail Alymov, Alexander Kalinin, Alexey Vinogradov, Alexey Rodionov, and Kirill Troshin. "Optoelectronic devices and methods for studying combustion and explosion processes." In Remote studies of combustion and explosion processes based on optoelectronic methods, 29–45. au: AUS PUBLISHERS, 2022. http://dx.doi.org/10.26526/chapter_62876066b5f307.71425279.

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The main objective of this book is to acquaint the reader with the main modern problems of the multisensor data analysis and opportunities of the hyperspectral shooting being carried out in the wide range of wavelengths from ultraviolet to the infrared range, visualization of the fast combustion processes of flame propagation and flame acceleration, the limit phenomena at flame ignition and propagation. The book can be useful to students of the high courses and scientists dealing with problems of optical spectroscopy, vizualisation, digital recognizing images and gaseous combustion. The main goal of this book is to bring to the attention of the reader the main modern problems of multisensory data analysis and the possibilities of hyperspectral imaging, carried out in a broad wave-length range from ultraviolet to infrared by methods of visualizing fast combustion processes, propagation and flames acceleration, and limiting phenomena during ignition and flame propagation. The book can be useful for students of higher courses and experimental scientists dealing with problems of optical spectroscopy, visualization, pattern recognition and gas combustion.
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4

Kailasanath, Kazhikathra. "Recent Developments in the Research on Pressure-Gain Combustion Devices." In Innovations in Sustainable Energy and Cleaner Environment, 3–21. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-9012-8_1.

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5

Fakeye, A. B., S. O. Oyedepo, O. S. I. Fayomi, Joseph O. Dirisu, and N. E. Udoye. "Fossil Fuel Combustion, Conversion to Near-Zero Waste Through Organic Rankine Cycle." In Handbook of Smart Materials, Technologies, and Devices, 2057–75. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-84205-5_69.

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Fakeye, A. B., S. O. Oyedepo, O. S. I. Fayomi, J. O. Dirisu, and N. E. Udoye. "Fossil Fuel Combustion, Conversion to Near-Zero Waste Through Organic Rankine Cycle." In Handbook of Smart Materials, Technologies, and Devices, 1–19. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-58675-1_69-1.

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7

Chaupatnaik, Anshuman, and Prabeer Barpanda. "Combustion Synthesized MLi2Ti6O14 (M = Sr, Ba, Pb) Titanate Anodes for Lithium-Ion Batteries." In Recent Research Trends in Energy Storage Devices, 9–17. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-6394-2_2.

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8

Bobusch, Bernhard C., Phillip Berndt, Christian O. Paschereit, and Rupert Klein. "Investigation of Fluidic Devices for Mixing Enhancement for the Shockless Explosion Combustion Process." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 281–97. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-11967-0_18.

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9

Bhattacharya, Atmadeep, and Amitava Datta. "Laminar Burning Velocity of Biomass-Derived Fuels and Its Significance in Combustion Devices." In Sustainable Energy Technology and Policies, 359–78. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-8393-8_16.

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10

Dăscălescu, Spiridon-Cristian-Dan, Marius Receanu, Laurenţiu Dimitriu, and Liliana Vornicu-Albu. "Researches on Cooling Air Flow Control Devices Using on Cars with Internal Combustion Engines." In CONAT 2016 International Congress of Automotive and Transport Engineering, 287–94. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-45447-4_32.

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Тези доповідей конференцій з теми "Combustion devices"

1

Frey, Manuel, Thomas Aichner, Josef Görgen, Blazenko Ivancic, Björn Kniesner, and Oliver Knab. "Modeling of Rocket Combustion Devices." In 10th AIAA/ASME Joint Thermophysics and Heat Transfer Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2010. http://dx.doi.org/10.2514/6.2010-4329.

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2

Myers, Michael J., John D. Myers, Baoping Guo, Chengxin Yang, and Christopher R. Hardy. "Practical internal combustion engine laser spark plug development." In Photonic Devices + Applications, edited by William J. Thomes, Jr. and Fred M. Dickey. SPIE, 2007. http://dx.doi.org/10.1117/12.728644.

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3

Hasan, A. M., R. Khan, E. Schutte, P. Verhaart, and K. Krishna Prasad. "APPLICATION OF DOWNDRAFT COMBUSTION TO WOODBURNING DEVICES." In International Heat Transfer Conference 9. Connecticut: Begellhouse, 1990. http://dx.doi.org/10.1615/ihtc9.620.

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4

Lezuo, Michael, and Oskar Haidn. "Transpiration cooling in H2/O2-combustion devices." In 32nd Joint Propulsion Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1996. http://dx.doi.org/10.2514/6.1996-2581.

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5

Frendi, Abdelkader, Tom Nesman, and Francisco Canabal. "Control of Combustion-Instabilities Through Various Passive Devices." In 11th AIAA/CEAS Aeroacoustics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2005. http://dx.doi.org/10.2514/6.2005-2832.

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6

Skrifvars, Bengt-Johan, Patrik Yrjas, Mikko Hupa, Martti Aho, Jaani Silvennoinen, Risto Etela¨aho, Juha Kouki, and Kari Saari. "Fireside Deposit Formation in Biomass Fired FBC: A Comparison Between Tests Performed in Three Significantly Different Sized Combustors." In 17th International Conference on Fluidized Bed Combustion. ASMEDC, 2003. http://dx.doi.org/10.1115/fbc2003-074.

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This paper deals with the prediction of ash related problems in fluidized bed boilers during co-firing of various bio-fuels. A study was performed where the slagging and fouling behavior was monitored in three different sized bubbling fluidized bed combustors, a 20 kW semi-pilot reactor, a 2 MW pilot-scale device and a 105 MW full-scale boiler. The aim of the study was to learn about how well slagging and fouling in a small-scale device compares to a full-scale boiler and to see how well the slagging and fouling can be predicted with a small-scale device. Various types of Scandinavian bio-fuels as well as peat were used both separately and mixed. From all three devices ash and deposit samples were collected during as uniform and stable conditions as possible. The fuels used in the three devices during the test campaigns were carefully chosen so that they would be as similar as possible. Bed, furnace and flue gas temperatures were monitored as well as flue gas emissions. The fuels, ashes and deposits were analyzed on their main components and deposition rates were calculated based on the deposit measurements. These data were finally used for assessing the slagging and fouling propensity of the fired fuel. The paper compares and discusses the results from the three different size classes.
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7

POLÁČIK, Jan, Barbora SCHÜLLEROVÁ, Jiří POSPÍŠIL, and Vladimír ADAMEC. "FINE AND ULTRA FINE PARTICLES FORMED DURING THE BIOMASS COMBUSTION IN SMALL COMBUSTION DEVICES." In NANOCON 2019. TANGER Ltd., 2020. http://dx.doi.org/10.37904/nanocon.2019.8694.

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8

Robinson, Matthew C., and Nigel N. Clark. "Fundamental Explorations of Spring-Varied, Free Piston Linear Engine Devices." In ASME 2014 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icef2014-5432.

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The conventional crank-based internal combustion engine faces many challenges to remain a viable option for electric power generation. Limitations in mechanical, thermal, and combustion efficiencies must be overcome by innovations in existing technologies and progress towards new ones. The free piston linear engine (FPLE) is a device with the potential to meet these challenges. Friction losses are reduced by avoiding rotational motion and linkages. Instead, electrical power is generated by the oscillation of the translator through a stator. Meanwhile, naturally variable compression ratio provides a unique platform to employ advanced combustion regimes. Possibly high variations in stroke length also result in unknown dead center piston positions and greater difficulties in compression control as compared to conventional engines. Without control, adverse occurrences such as misfire, stall, over-fueling, and rapid load changes pose greater complications for stable system operation. Based on previous research, it is believed that incorporating springs will advance former designs by both increasing system frequency and providing a restoring force to improve cycle-to-cycle stability. Despite growing interest in the FPLE, current literature does not address the use of springs within a dual, opposed piston design. This investigation is an extension of recent efforts in the fundamental analysis of such a device. Previous work by the authors combined the dynamics of a damped, spring mass system with in-cylinder thermodynamic expressions to produce a closed-form non-dimensional model. Simulations of this model were used to describe ideal Otto cycle as the equilibrium operating point. The present work demonstrates more realistic modelling of the device in three distinct areas. In the previous model, the work term was a constant coefficient over the length of the stroke, instantaneous heat addition (representing combustion) was only seen at top dead center positions, and the use of the Otto cycle included no mechanism for heat transfer except at dead center positions. Instead, a position based sinusoid is employed for the work coefficient causing changes to the velocity and acceleration profiles. Instantaneous heat addition prior to top dead center is allowed causing the compression ratio to decrease towards stable, Otto operation. And, a simple heat transfer scheme is used to permit cylinder gas heat exchange throughout the stroke resulting in deviation from Otto operation. Regardless, simulations show that natural system stability arises under the right conditions. Highest efficiencies are achieved at a high compression ratio with minimal heat transfer and near-TDC combustion.
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9

Saddawi, Salwan David, Timoleon Kipouros, and Mark Savill. "Computational Engineering Design for Micro-Scale Combustion Devices: A Thermally Improved Configuration." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-94599.

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A multi-objective design optimisation study has been carried out with the objectives to improve the overall efficiency of the device and to reduce the fuel consumption for the proposed micro-scale combustor design configuration. In a previous study we identified the topology of the combustion chamber that produced improved behaviour of the device in terms of the above design criteria. We now extend our design approach, and we propose a new configuration by the addition of a micro-cooling channel that will improve the thermal behaviour of the design as previously suggested in literature. Our initial numerical results revealed an improvement of 2.6% in the combustion efficiency when we applied the micro-cooling channel to an optimum design configuration we identified from our earlier multi-objective optimisation study, and under the same operating conditions. The computational modelling of the combustion process is implemented in the commercial computational fluid dynamics package ANSYS-CFX using Finite Rate Chemistry and a single step hydrogen-air reaction. With this model we try to balance good accuracy of the combustion solution and at the same time practicality within the context of an optimisation process. The whole design system comprises also the ANSYS-ICEM CFD package for the automatic geometry and mesh generation and the Multi-Objective Tabu Search algorithm for the design space exploration. We model the design problem with 5 geometrical parameters and 3 operational parameters subject to 5 design constraints that secure practicality and feasibility of the new optimum design configurations. The final results demonstrate the reliability and efficiency of the developed computational design system and most importantly we assess the practicality and manufacturability of the revealed optimum design configurations of micro-combustor devices.
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10

Kale, M. A., C. P. Joshi, S. V. Moharil, P. Predeep, Mrinal Thakur, and M. K. Ravi Varma. "Combustion Synthesis of Magnesium Aluminate." In OPTICS: PHENOMENA, MATERIALS, DEVICES, AND CHARACTERIZATION: OPTICS 2011: International Conference on Light. AIP, 2011. http://dx.doi.org/10.1063/1.3643682.

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Звіти організацій з теми "Combustion devices"

1

Shallcross, D. C. Devices and methods for in-situ combustion ignition. Office of Scientific and Technical Information (OSTI), October 1989. http://dx.doi.org/10.2172/5568674.

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2

Ruby N. Ghosh, Reza Loloee, Roger G. Tobin, and Yung Ho Kahng. Silicon Carbide Micro-devices for Combustion Gas Sensing under Harsh Conditions. Office of Scientific and Technical Information (OSTI), April 2006. http://dx.doi.org/10.2172/882583.

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3

Ruby N. Ghosh, Peter Tobias, and Roger G. Tobin. SILICON CARBIDE MICRO-DEVICES FOR COMBUSTION GAS SENSING UNDER HARSH CONDITIONS. Office of Scientific and Technical Information (OSTI), October 2004. http://dx.doi.org/10.2172/835632.

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4

Ruby N. Ghosh, Peter Tobias, and Roger G. Tobin. SILICON CARBIDE MICRO-DEVICES FOR COMBUSTION GAS SENSING UNDER HARSH CONDITIONS. Office of Scientific and Technical Information (OSTI), April 2004. http://dx.doi.org/10.2172/824012.

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5

Ruby Ghosh, Reza Loloee, and Roger Tobin. Silicon Carbide Micro-devices for Combustion Gas Sensing under Harsh Conditions. Office of Scientific and Technical Information (OSTI), September 2008. http://dx.doi.org/10.2172/961522.

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6

Ruby N. Ghosh and Peter Tobias. DEVELOPMENT OF SiC DEVICES FOR DIAGNOSTICS AND CONTROL OF COMBUSTION PRODUCTS IN ENERGY PLANT ENVIRONMENTS. Office of Scientific and Technical Information (OSTI), December 2003. http://dx.doi.org/10.2172/823389.

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7

Howland, Heathcliff. GRI-04-0066A Pilot Project Addendum to Functional Specifications. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), June 2005. http://dx.doi.org/10.55274/r0012115.

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Describes the results of an engine converted per PRCI Advanced Two-Stroke Functional Specification including: - Development and demonstration of PLC code in conformance with the specification. - Verify the suitability of the specified instrumentation, and evaluate the effectiveness of the control technology. A complete control system upgrade was necessary to achieve the level of control necessary to meet the specification. All of the existing field devices that met the specification were re-used to minimize project costs. A continuous combustion pressure monitoring system as part of the controls upgrade so engine control performance could be evaluated on an individual combustion cycle basis. The engine was also equipped with a continuous emissions monitoring system to map engine emissions and monitor emissions performance data before and after the controls upgrade.
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Funk, D. J., D. S. Moore, R. K. Mongia, E. Tomita, F. K. Hsu, L. Talbot, R. W. Dibble, J. Lovett, and Akira Yamazaki. Development of inexpensive continuous emission monitors for feedback control of combustion devices that minimize greenhouse gases, toxic emissions, and ozone damaging products. Office of Scientific and Technical Information (OSTI), November 1998. http://dx.doi.org/10.2172/677028.

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9

Bajwa, Abdullah, and Timothy Jacobs. PR-457-17201-R02 Residual Gas Fraction Estimation Based on Measured Engine Parameters. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), February 2019. http://dx.doi.org/10.55274/r0011558.

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Gas exchange processes in two-stroke internal combustion engines, commonly referred to as scavenging, are responsible for removing the exhaust gases in the combustion chamber and preparing the combustible fuel-oxidizer mixture that undergoes combustion and converts the chemical energy of the fuel into mechanical work. Scavenging is a complicated phenomenon because of the simultaneous introduction of fresh gases into the engine cylinder through the intake ports, and the expulsion of combustion products from the previous cycles through the exhaust ports. A non-negligible fraction of the gaseous mixture that is trapped in the cylinder at the conclusion of scavenging is composed of residual gases from the previous cycle. This can cause significant changes to the combustion characteristics of the mixture by changing its composition and temperature, i.e. its thermodynamic state. Thus, it is vital to have accurate knowledge of the thermodynamic state of the post-scavenging mixture to be able to reliably predict and control engine performance, efficiency and emissions. Two tools for estimating the trapped mixture state - a simple scavenging model and empirical correlations - were developed in this study. Unfortunately, it is not practical to directly measure the trapped residual fraction for engines operating in the field. To overcome this handicap, simple scavenging models or correlations, which estimate this fraction based on some economically measurable engine parameters, can be developed. This report summarizes the results of event-II of a multi-event project that aims to develop such mathematical formulations for stationary two-stroke natural gas engines using data from more advanced models and experimentation. In this event, results from a GT-Power based model for an Ajax E-565 single-cylinder engine are used to develop a three-event single zone scavenging model and empirical correlations. Both of these mathematical devices produce accurate estimates of the trapped mixture state. The estimates are compared to GT-Power results. In the next event of the project, these results will be validated using experimental data. Various steps followed in the development of the model have been discussed in this report, and at the end some results and recommendations for the next event of the project have been presented.
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Nowlin, Jacob, Kevin Wallace, Kyle Beurlot, Mark Patterson, and Timothy Jacobs. PR-457-21206-R01 CFD Study of Prechamber NOx Production Mechanisms. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), July 2023. http://dx.doi.org/10.55274/r0000027.

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Use of the pre-combustion chamber (PCC) as an ignition source in large-bore natural gas engines has shown promise in reducing emissions. By increasing the ignition energy and surface area via a turbulent jet, these devices can extend the lean operating limit of the engine and reduce oxides of nitrogen (NOx). This study aims to characterize the sensitivity of main chamber NOx formation to changes in the PCC jet. A CFD model of a Cooper-Bessemer GMV two-stroke lean-burn natural gas engine is used for this purpose. The temperature and chemical composition of the PCC jet are varied across several tasks, and the resulting changes in main chamber NO and shy;x emissions are recorded. Three-dimensional plotting tools are used to determine where and when NOx forms in the engine during the cycle. Data on the chemical pathways to NO and NO2 and shy; and shy; formation and destruction is also presented.
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