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Littérature scientifique sur le sujet « ENGINE LEAKAGE »

Auteur : Grafiati
Publié le 11 septembre 2023

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Articles de revues sur le sujet "ENGINE LEAKAGE"

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Kowalski, Jerzy. « An Experimental Study of Emission and Combustion Characteristics of Marine Diesel Engine in Case of Cylinder Valves Leakage ». Polish Maritime Research 22, no 3 (1 septembre 2015) : 90–98. http://dx.doi.org/10.1515/pomr-2015-0061.

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Abstract Presented paper shows the results of the laboratory tests on the relationship between throttling of both air intake duct and exhaust gas duct and a gaseous emission from the marine engine. The object of research is a laboratory, four-stroke, DI diesel engine, operated at loads from 50 kW to 250 kW at a constant speed equal to 750 rpm. During the laboratory tests over 50 parameters of the engine were measured with its technical condition recognized as a „working properly” and with simulated leakage of both air intake valve and exhaust gas valve on the second cylinder. The results of this laboratory research confirm that the leakage of cylinder valves causes no significant changes of the thermodynamic parameters of the engine. Simulated leakages through the inlet and exhaust valve caused a significant increase in fuel consumption of the engine. Valve leakages cause an increase of the exhaust gas temperature behind the cylinder with leakage and behind other cylinders. The exhaust gas temperature increase is relatively small and clearly visible only at low loads of the engine. The increase of the temperature and pressure of the charging air behind the intercooler were observed too. Charging air temperature is significantly higher during the engine operation with inlet valve leakage. The study results show significant increases of the CO, NOx and CO2 emission for all the mentioned malfunctions. The conclusion is that the results of measurements of the composition of the exhaust gas may contain valuable diagnostic information about the technical condition of the air intake duct and the exhaust gas duct of the marine engine.
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Choi, Gyeung Ho, Seong Keun Shin, Seok Choun Bae, Yong Jong Chung et Sung Bin Han. « Effects of injector leakage on liquid propane injection engine performance ». Proceedings of the Institution of Mechanical Engineers, Part D : Journal of Automobile Engineering 219, no 4 (1 avril 2005) : 559–64. http://dx.doi.org/10.1243/095440705x11149.

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This study aims to provide basic technical information for research regarding starting performance improvement by using a 2.656 cm3 V6 liquid propane injection engine to study the effects of varying the liquefied petroleum gas (LPG) leakage on starting performance and to analyse the effects of such leakage on emission characteristics. To determine the LPG injection amount that corresponds to the desired LPG leakage, 1–30 l was injected to find the critical point and, since the injected fuel was detected at the intake starting from 5.5 l, starting performance comparisons of engine speed and exhaust gases were made at 0 l, 1 l, 2 l, 3 l, 4 l, 5 l, and 6 l by measuring the desired value five times and taking the average. Also, to study the effects of a small leak, the starting performance was tested while injecting 0 l, 0.2 l, 0.4 l, 0.6 l, 0.8 l, and 1 l. The major conclusions of this work are as follows: The results of determining the critical point of starting delay for LPG leakages of 1–30 l show that the critical point is 21 l and 14 cycles. For LPG leakages of 1–6 l, the starting time and unburned hydrocarbon (HC) increases with increasing LPG leakage. At LPG leakage of 0.2 l, the starting time is much faster at 1 cycle, but unburned HC increases with increasing LPG leakage.
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Miao, Shujing, Haiyang Liu, Haitang Cen, Jiang Liu, Huaqiang Li et Gang Xu. « Study on Leakage Effect Factors of Two-Stroke Micro Free Piston Swing Engine ». Micromachines 13, no 8 (14 août 2022) : 1314. http://dx.doi.org/10.3390/mi13081314.

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The two-stroke micro free piston swing engine (MFPSE) is a portable power device. Its seal performance plays an important role in the dynamic properties and efficiency of microengines. The present work established the leakage model of the two-stroke micro free piston swing engine by utilizing the compressible flow Reynolds Navier–Stokes equation. The obtained nondimensional mass leakage was related to the seal gap height, seal inlet pressure, size factor and compression ratio. Simulation investigated how the different seal gap heights and size factors affected the pressure, temperature and mass leakage of micro engines. The results showed that when the seal gap height of the combustion chamber increased, the maximum pressure and cycle power declined, obviously. However, the maximum temperature was scarcely affected. The mass leakage was not greatly impacted when the compression ratio was less than 5. However, the mass leakage dramatically increased when the seal gap was more than 10 μm or the size factor was less than 0.4. The investigation revealed these mass leakage effect factors and provided a guide for the seal and structure design of the two-stroke micro free piston swing engine.
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DZIUBAK, Tadeusz, et Mirosław KARCZEWSKI. « Operational malfunctions of turbochargers – reasons and consequences ». Combustion Engines 164, no 1 (1 février 2016) : 13–21. http://dx.doi.org/10.19206/ce-116484.

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The paper discusses the most frequently occurring types of damage in turbochargers fitted in modern combustion engines and their influence on the engine basic operational indexes. The following causes of turbocharger malfunctions have been discussed: no lubrication, low lubricant pressure, reduced lubricant quality, foreign objects in the charged air and in the exhaust gas. Example malfunctions resulting from the said causes have been shown. The experimental part discusses the influence of a reduction of the charging pressure resulting from a leakage in the intake system on the effective parameters of a diesel engine fitted in light-duty and heavy-duty vehicles. The leakage in the intake system has been simulated by boring holes of the diameter of 3 and 12 mm in the intake manifold downstream of the turbocharger. The influence has been determined of the leakage of the turbocharging system on the value of the charging pressure, maximum effective power, engine torque, unit and hourly fuel consumption and the concentration of the exhaust components. A significant impact has been observed of the leakage of the turbocharging system on the effective parameters of the tested diesel engine and exhaust gas composition.
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Kołodziej, Szymon. « The effect of the leakage of the engine arrest engine and emissions of harmful substances ». AUTOBUSY – Technika, Eksploatacja, Systemy Transportowe 19, no 6 (30 juin 2018) : 502–5. http://dx.doi.org/10.24136/atest.2018.121.

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In this article, the issues related to vehicular traffic in big cities and heightened harmful substance emissions stemming from it were described. In the research part, the effect of air leakage in the SI engine intake manifold on substance emissions was investigated. The manifold was customized to simulate air leakage in each of its air ducts. Same ratio of leakage was assumed for each duct, and substance emissions were measured in full range of engine rotational speeds. A difference in exhaust gas composition was shown for each researched variant, being the result of varying cylinder filling ratio due to simulated air leakage.
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Jukl, Michal, Adam Polcar et Jiří Čupera. « Possibilities of Monitoring the Technical Condition of the Combustion Engine with Starter Load Current ». Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 62, no 5 (2014) : 961–69. http://dx.doi.org/10.11118/actaun201462050961.

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This article deals with the verification of relations between the electric current of engine starter and tightness of the combustion chamber and the possibility of its use for the evaluation of the state in terms of engine wear. Engine wear is closely related to the quality of fuel combustion and also with the amount of produced harmful emissions. On this basis, it would be possible to extend the technical requirements of the protocol OBD to include the indirect control of engine wear. To meet the objectives set out above measurement was carried out by a petrol engine, which was located in the vehicle Škoda Felicia Combi GLX 1.3 The whole measurement was divided into several parts. The first measurement was carried out on the abovementioned motor without simulating leakage. The second measurement was performed when the leakage of one cylinder was simulated. Simulated leakage was conducted at removing the spark plugs. Other measurements simulated “mild” leak of the whole engine – all cylinders. Leakage was implemented by loosing all the spark plugs about 8 turns against full tightening with the appropriate torque. The last, fourth measurement simulates a “large” leaks of engine cylinders. This leakage was induced by removing all the spark plugs from all cylinders. As the measurement results showed leakage of one cylinder, and also the whole engine is reflected not only in the individual amplitude of the starter current, but also the shape of the entire curve.
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Zhang, Saifei, Chunhua Zhang, Yong Liu, Wei Wu, Han Wu et Shihua Yuan. « Parametric Simulations on Leakage and Performance of a Miniature Free-Piston Generator (MFPG) ». Applied Sciences 11, no 16 (23 août 2021) : 7742. http://dx.doi.org/10.3390/app11167742.

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The miniaturization of electrical equipment and popularization of portable devices is an appealing motivation for the development of small-scale heat engines. However, the in-cylinder charge leaks severely as the engine dimension shrinks. The free-piston engine on a small scale provides better sealing than other miniature heat engines. Therefore, a miniature free-piston generator (MFPG) with a single-piston internal combustion engine (ICE) and a voice coil motor (VCM) was proposed in this work. A dynamic model with special attention on the heat transfer and leakage was established accordingly, upon which parametric studies of leakage and its effects on the performance of the MFPG system were performed. Four key parameters, including scavenging pressure, ignition position, combustion duration and piston mass, were considered in the model. The results showed that the mass leakage during the compression decreases with the rise of the motoring current. The indicated thermal efficiency can be improved by boosting scavenging pressure and increase motoring current. The critical ignition position is 2 mm before the top dead center. When ignition occurs later than that, the MFPG system is incapable of outputting power. The chemical to electric energy conversion efficiency is about 5.13%, with an output power of 10~13 W and power density around 4.7~5.7 W/cc.
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Qi, Congzheng, Zemin Ding, Lingen Chen, Yanlin Ge et Huijun Feng. « Modeling and Performance Optimization of an Irreversible Two-Stage Combined Thermal Brownian Heat Engine ». Entropy 23, no 4 (31 mars 2021) : 419. http://dx.doi.org/10.3390/e23040419.

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Based on finite time thermodynamics, an irreversible combined thermal Brownian heat engine model is established in this paper. The model consists of two thermal Brownian heat engines which are operating in tandem with thermal contact with three heat reservoirs. The rates of heat transfer are finite between the heat engine and the reservoir. Considering the heat leakage and the losses caused by kinetic energy change of particles, the formulas of steady current, power output and efficiency are derived. The power output and efficiency of combined heat engine are smaller than that of single heat engine operating between reservoirs with same temperatures. When the potential filed is free from external load, the effects of asymmetry of the potential, barrier height and heat leakage on the performance of the combined heat engine are analyzed. When the potential field is free from external load, the effects of basic design parameters on the performance of the combined heat engine are analyzed. The optimal power and efficiency are obtained by optimizing the barrier heights of two heat engines. The optimal working regions are obtained. There is optimal temperature ratio which maximize the overall power output or efficiency. When the potential filed is subjected to external load, effect of external load is analyzed. The steady current decreases versus external load; the power output and efficiency are monotonically increasing versus external load.
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Kurhekar, Swapnil D., et Abhijeet B. Tamse. « Quality Improvement of Oil and Fuel Leakage in Diesel Engine by using Semi Automatic Setup ». International Journal for Research in Applied Science and Engineering Technology 11, no 3 (31 mars 2023) : 310–18. http://dx.doi.org/10.22214/ijraset.2023.49405.

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Abstract: As we know when engine goes to testing department before that we test it through semi-automatic setup which is installed on assembly line converyor to test the oil and fuel leakage of diesel engine.Now different trial were taken on engine by using methodology which includes ATEQ D520 unit and air pressure regulator for detecting the leakage quantity.Actually ATEQ D520 UNIT is a flowmeter which measure a drop in pressure with a differential sensor.Here we supplied pressurized air into the engine through breather plug and overflow pipe.If leakage not found engine will dispatched to testing department and if leakage is found the problem may solve by spraying soap water in leakage area so that in that area bubbles comes out .This work which emphasis on the analysis of problem due to which engine reject from testing department and also time and cost saving analysis for one month.Due to this setup improvement in PQCDSM,PPM and reduction in cost poor quality supplied to customers from 28% to 18% of cost per benefit,better customer satisfaction
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Hu, Ming Jiang. « Optimizing Crankcase Ventilation System of Gasoline Engine ». Applied Mechanics and Materials 58-60 (juin 2011) : 171–76. http://dx.doi.org/10.4028/www.scientific.net/amm.58-60.171.

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Based on the design goals of the gasoline engine crankcase ventilation system, the features and the layout were described on the gasoline engine crankcase ventilation system, the working model was established on the gasoline engine crankcase ventilation system; using the fluid properties and the mathematical calculation method, the optimizing strategy was proposed on the piston gas leakage, the influencing factors were analyzed on the gasoline engine crankcase vacuum, the design strategy of the flow characteristics was developed on the PCV valve. Using analog control test platform of the gasoline engine, the tests were made on the piston gas leakage, the crankcase vacuum and PCV valve flow characteristics of the gasoline engine crankcase ventilation system. The test result showed that the optimized maximum piston leakage flow was 14L/min; the increasing rates of the optimized intake pipe and crankcase vacuum average were according 5.6% and 8.0%. This could indicate that the working model on the gasoline engine crankcase ventilation system was correct; the proposed strategies on the piston gas leakage, the crankcase vacuum and PCV valve flow characteristics were feasible in the gasoline engine crankcase ventilation system.
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Thèses sur le sujet "ENGINE LEAKAGE"

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Chaudhry, Udey. « Tip leakage flow, heat transfer and blade lifting in a jet engine turbine ». Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/94499.

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An existing Navier-Stokes code (MEFP) was used to calculate developing flow and heat transfer in turbine tip gaps. Successful calculations of the heat transfer to a model turbine blade tip were obtained with a Prandtl mixing length turbulence model. The calculations revealed details of the flow development including recirculation and reattachment on the blade tip surface. The calculated heat transfer distributions were in good agreement with experimental data. A combined solution of the energy equation in the tip gap flow and in the rotor blade tip gave tip temperature distributions. An independent computational study, using the same numerics as MEFP but a separate new computer program, was also performed to investigate the numerical accuracy of heat transfer calculations for fully developed flow. A literature survey of gas turbine blade materials and factors influencing turbine tip blade life was performed. Approximate temperature ranges for the significant blade life reduction mechanisms, hot corrosion, oxidation, and melting were determined. calculations for typical jet engine conditions, In the present a maximum tip temperature of 1488 K was predicted which would lead to high oxidation rates for present day turbine blade alloys.
M.S.
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Geiger, Derek Henry. « Comparative Analysis of Serrated Trailing Edge Designs on Idealized Aircraft Engine Fan Blades for Noise Reduction ». Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/40542.

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The effects of serrated trailing edge designs, designed for noise reduction, on the flow-field downstream of an idealized aircraft engine fan blade row were investigated in detail. The measurements were performed in the Virginia Tech low speed linear cascade tunnel on one set of baseline GE-Rotor-B blades and four sets of GE-Rotor-B blades with serrated trailing edges. The four serrated blade sets consisted of two different serration sizes (1.27 cm and 2.54 cm) and for each different serration size a second set of blades with added trailing edge camber. The cascade row consisted of 8 GE-Rotor-B blades and 7-passages with adjustable tip gap settings. It had an inlet angle of 65.1º, stagger angle of 56.9º and a turning angle of 11.8º. The tunnel was operated with a tip gap setting of 1.65% chord, with a Reynolds number based on the chord of 390,000. Blade loading measurements performed on each set of blades showed that it was slightly dependent on the serration shape. As the serration size was increased the blade loading decreased, but adding droop increased the blade loading. The Pitot-static cross-sections showed that flow-fields near the upper and lower endwalls cascade tunnel were similar with the baseline or the serrated blade downstream of the blade row. In the wake region, the individual trailing edge serrations tips and valleys could be seen. As the wake convected downstream, the individual tips and valleys became less visible and the wake was more uniform in profile. The tip leakage vortex was only minimally affected by the trailing edge serrations. This conclusion was further reinforced by the three-component hot-wire cross-sectional measurements that were performed from the lower endwall to the mid-span of the blade. These showed that the mean streamwise velocity, turbulence kinetic energy and turbulence kinetic energy production in the tip leakage region were nearly the same for all four serrated blades as well as the baseline. The vorticity in this region was a more dependent on the serration shape and as a result increased with serration size compared to the baseline. Mid-span measurements performed with the three-component hot-wire showed the spreading rate of the wake and the decay rate of the wake centerline velocity deficit increased with serration size compared to the baseline case. Drooping of the trailing edge only minimally improved the spreading and decay rates. This improvement in these rates was predicted to reduce the tonal noise at the leading edge of the downstream stator vane because the periodic fluctuation associated with the sweeping of the rotor blade wakes across it, was due to the pitchwise variation in the mean streamwise velocity. The wakes were further compared to the mean velocity and turbulence profiles of plane wakes, which the baseline and the smallest serration size agreed the best. As the serration size was increased and drooping was added, the wakes became less like plane wakes. Spectral plots at the wake centerline in all three velocity directions showed some evidence of coherent motion in the wake as a result of vortex shedding.
Master of Science
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Virdi, Amandeep Singh. « Aero-thermal performance and enhanced internal cooling of unshrouded turbine blade tips ». Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:62c3e94a-a1ff-47a8-bb81-e870b0013f11.

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The tips of unshrouded, high-pressure turbine blades are prone to significantly high heat loads. The gap between the tip and over-tip casing is the root cause of undesirable over-tip leakage flow that is directly responsible for high thermal material degradation and is a major source of aerodynamic loss within a turbine. Both must be minimised for the safe working and improved performance of future gas-turbines. A joint experimental and numerical study is presented to understand and characterise the heat transfer and aerodynamics of unshrouded blade tips. The investigation is undertaken with the use of a squealer or cavity tip design, known for offering the best overall compromise between the tip aerodynamics, heat transfer and mechanical stress. Since there is a lack of understanding of these tips at engine-realistic conditions, the present study comprises of a detailed analysis using a high-speed linear cascade and computational simulations. The aero-thermal performance is studied to provide a better insight into the behaviour of squealer tips, the effects of casing movement and tip cooling. The linear cascade environment has proved beneficial for its offering of spatially-resolved data maps and its ability to validate computational results. Due to the unknown tip gap height within an entire engine cycle, the effects of gap height are assessed. The squealer's aero-thermal performance has been shown to be linked with the gap height, and qualitative different trends in heat transfer are established between low-speed and high-speed tip flow regimes. To the author's knowledge, the present work is the first of its kind, providing comprehensive aero-thermal experimental research and a dataset for a squealer tip at engine-representative transonic conditions. It is also unique in terms of conducting direct and systematic validations of a major industrial computational fluid dynamics method for aero-thermal performance prediction of squealer tips at enginerepresentative transonic conditions. Finally, after recognising the highest heat loads are found on the squealer rims, a novel shaped squealer tip has been investigated to help improve the thermal performance of the squealer with a goal to improve its durability. It has been discovered that a seven percent reduction in tip temperature can be achieved through incorporating a shaped squealer and maximising the internal cooling performance.
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Kluka, James Anthony. « The design of low-leakage modular regenerators for gas-turbine engines ». Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/46564.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1995.
Includes bibliographical references (p. [229]-231).
The design of a modular regenerator concept (patented by Wilson and MIT) for gas-turbine engines is investigated. Mechanical design analysis and theoretical performance calculations were made to show the concept's functionality and performance benefits over current regenerator designs. The modular regenerator concept consists of a ceramic-honeycomb matrix discretized into rectangular blocks, called modules. The modules are exposed to hot (turbine exhaust) and cold (compressor outlet) streams, then are periodically transported through linear passages from one stream to the other. Separating the matrix into modules reduces the transverse sealing lengths substantially. Furthermore, the range of gas-turbine applications increases with the modular concept since larger matrix face areas are possible. Module design is investigated which includes using current research results pertaining to manufacturing technology for rotary regenerators. Mechanical design analysis was made to investigate the possible module-movement schemes. Several regenerator configurations and orientations are introduced. One particular concept balances the pressure forces such that the power requirement for module movement is reduced substantially. Design drawings of a possible modular prototype showing the general configuration and mechanical layout accompany the analysis. A method for determining the regenerator size and measuring its fluid-mechanical and heat-transfer performance is given. An optimization study is made by analyzing the effects when several chosen design parameters are varied. Numerical results of a modular concept for a small gas-turbine engine (120 kW) are given. Seal leakage calculations were made for two modular concepts and compared to the leakage rates for two rotary concepts. The total seal-leakage rates for both modular cases were considerably less than the rotary concepts and can be reduced to well under one percent. In addition, techniques for further leakage reduction are given. Other design issues (to further prove the modular concept's feasibility) not covered in this study have been identified. Guidelines for investigating these issues are given.
by James Anthony Kluka.
S.M.
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Dagson, Josef, et Källström Samuel Nissilä. « Air Leakage Diagnosis in Heavy Duty Truck Engines with EGR and VGT ». Thesis, Linköpings universitet, Fordonssystem, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-88183.

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Scania CV AB is a leading company within development and production of buses, trucks as well as industrial and marine engines. New environmental and safety legislations continuously demand higher quality from the products. An upcoming European legislation, Euro 6, implies that gas leakages from truck engines should be detected while driving. If the source of the leakage is not only detected, but also isolated, that is separated from other faults, the adjustments in the workshop goes faster since there is no need for leakage localisation. A faster reparation increases the up-time, i.e. the amount of time that the truck can be used. This master thesis work uses current methods developed at Scania for residual generation to perform model-based leakage diagnosis. In this work, measurements are gathered for dierent sensor faults and two leakages. The measurements are used to evaluate the actual performance of the resulting diagnosis system. The result, based on the residuals generated by the method, shows that leakages on the boost-side and the exhaust-side can be detected, and isolated from faults in the pressure sensors on the boost-side and the exhaust-side. The isolation of these four faults is considered the hardest to achieve among sensor faults and leakages why the full isolation performance is promising. Further measurements are needed to determine the full isolation performance of the diagnosis system. The resulting system is reasoned to be suitable for execution in real time on-board the truck.
Scania CV AB är en ledande koncern inom utveckling och produktion av bussar, lastbilar samt industri- och marinmotorer. Nya lagkrav för miljö och säkerhet ställer ständigt högre krav på de tillverkade produkterna. Ett nära förestående lagkrav för lastbilar, Euro 6, innebär att gasläckage från motorn ska detekteras under körning. Om läckaget förutom att detekteras också kan isoleras, det vill säga särskiljas från andra fel, går reparationen i verkstaden snabbare då man slipper lokalisera läckaget. En snabbare reparation ökar up-time, det vill säga tiden som lastbilen kan användas på åkeriet. I detta exjobb används befintliga metoder för residualgenerering framtagna på Scania för att åstadkomma modelbaserad läckagediagnos. Arbetet tar även fram mätdata för olika givarfel samt för två läckage i motorn. Denna mätdata används för att utvärdera det erhållna diagnossystemets faktiska prestanda. Resultatet, som bygger på residualerna som metoden genererat, visar att läckage går att detektera, och att läckagen går att isolera från fel på tryckgivarsensorer på laddluftssidan och avgassidan. Denna isolering anses vara den svåraste att uppnå av alla sensorfel samt läckage varvid övrig isoleringsprestande verkar lovande. Däremot behövs mer mätdata för att säkert kunna fastställa övrig isoleringsprestanda. Diagnosmetoden lämpar sig troligen för exekvering i realtid ombord på lastbilen.
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Ranson, William Wayne. « Adiabatic Effectiveness Measurements of Leakage Flows along the Hub Region of Gas Turbine Engines ». Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/77017.

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To prevent melting of turbine blades, numerous cooling schemes have been developed to cool the blades using cooler air from the compressor. Unfortunately, the clearance gap between adjacent hub sections allows coolant to leak into the hub region. Coolant flow also leaks into the hub region through gaps between individual stages. The results of a combined experimental and computational study of cooling along the hub of a first stage turbine blade caused by leakage flows are discussed in detail. Additionally, this study examines a novel cooling feature, called a microcircuit, which combines internal convective cooling with external film cooling. For the experimental investigation, scaled up blades were tested in a low speed wind tunnel. Adiabatic effectiveness measurements were made with infrared thermography of the entire hub region for a range of leakage flow conditions. For the computations, a commercially available computational fluid dynamics (CFD) code, FLUENT 6.0, was used to simulate the various flows. Results show that featherseal leakage flows provide small cooling benefits to the hub. Increases in featherseal flow provide no additional cooling to the hub region. Unlike the featherseal, leakage flows from the front rim provide ample cooling to the hub region, especially the leading edge of the blade passage. None of the leakage flows provide significant cooling to the pressure side region of the hub or trailing edge suction side. With the addition of the hub microcircuits, there is improved hub cooling of the suction side of the blades. Though the coolant exit uniformity was low and affected by the featherseal flow, the microcircuits were shown to provide more cooling along the hub region. Good agreements were observed between the computational and experimental results, though computations over-predicted front rim cooling and microcircuit uniformity.
Master of Science
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Шевченко, Сергій Андрійович. « Удосконалення пневмосистеми запуску ракетних двигунів шляхом стабілізації тиску робочого тіла та поліпшення її динамічних характеристик ». Thesis, НТУ "ХПІ", 2017. http://repository.kpi.kharkov.ua/handle/KhPI-Press/29030.

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Дисертація на здобуття наукового ступеня кандидата технічних наук зі спеціальності 05.05.17 – гідравлічні машини та гідропневмоагрегати. – Національний технічний університет "Харківський політехнічний інститут". – Харків, 2017. Дисертація присвячена дослідженню вдосконаленої пневмосистеми багаторазового запуску маршового рідинного ракетного двигуна верхнього ступеня ракети-носія. Система запуску, яка містить частину пневмоблока двигуна, здійснює розкручування турбонасосного агрегату за рахунок подачі стисненого гелію на його турбіну. Особливістю системи є використання регулятора тиску гелію із пневмокеруванням. Розроблений й реалізований у практиці проектування новий комплекс дискретно-континуальних математичних моделей для газодинамічного розрахунку цієї пневмосистеми, а також аналізу сил тертя й витоків газу у фторопластових манжетних ущільненнях регуляторів. Запропоновано новий розрахунковий метод дослідження пневмосистеми, що проектується, на динамічну стійкість. Досліджені газодинамічні характеристики металлорукава. Розроблено нову концепцію й впроваджено конструкцію лабораторного стенда, що дозволяє економити гелій при доводочних випробуваннях системи. Виконано розрахунково-експериментальне дослідження пневмосистеми, а його рекомендації зі зміни параметрів регулятора, що знижують коливальність і поліпшують інші динамічні характеристики, впроваджені на двигуні.
The thesis for the scientific degree of the Candidate of Technical Sciences by specialty 05.05.17 – hydraulic machines and hydropneumatic units. – National Technical University "Kharkiv Polytechnic Institute", Kharkiv, 2017. The dissertation describes research of perfected pneumatic starting system of a main restartable liquid-propellant rocket engine destined for a launch vehicle upper stage. The starting system, which structure includes a part of the engine pneumatic unit, performs turbopump spin-up by supplying compressed helium to its turbine. A feature of the system is application of a pneumatically controlled helium pressure regulator. New complex of discrete-continual mathematical models is developed and implemented in the designing practice for the gas-dynamic analysis of this pneumatic system and analysis of friction forces and gas leaks through fluoroplastic lip-type seals of regulators. New computational method is proposed for the developed system’s dynamic stability research. The gas-dynamic characteristics of a metal hose are researched. New concept of the laboratory stand is developed and implemented to enable helium saving at development tests. Experimental-computational research of the pneumatic system is performed, recommendations of which are introduced into the engine in relation to the regulator parameters reducing oscillations and improving other dynamic characteristics.
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Шевченко, Сергей Андреевич. « Усовершенствование пневмосистемы запуска ракетных двигателей путём стабилизации давления рабочего тела и улучшения её динамических характеристик ». Thesis, Государственное предприятие "Конструкторское бюро "Южное" им. М. К. Янгеля", 2017. http://repository.kpi.kharkov.ua/handle/KhPI-Press/29036.

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Диссертация на соискание ученой степени кандидата технических наук по специальности 05.05.17 – гидравлические машины и гидропневмоагрегаты. – Национальный технический университет "Харьковский политехнический институт". – Харьков, 2017. Диссертация посвящена исследованию усовершенствованной пневмосистемы многократного запуска маршевого жидкостного ракетного двигателя верхней ступени ракеты-носителя с насосной подачей компонентов топлива в камеру сгорания. Система запуска, в состав которой входит часть пневмоблока двигателя, осуществляет раскрутку турбонасосного агрегата за счет подачи сжатого гелия из шаробаллона на турбину. Особенностью системы является использование регулятора давления гелия с пневмоуправлением. Исследованная система обеспечивает пять включений двигателя РД861К при идентичных импульсах давления подачи газа, имеющих прямоугольную вершину и предельно крутые фронты. Разработан и использован в практике проектирования новый комплекс дискретно-континуальных математических моделей для газодинамического расчета этой пневмосистемы, а также анализа сил трения и утечек газа во фторопластовых манжетных уплотнениях регуляторов. В моделях учтены новые эффекты: теплообмен газа со стенками полостей и трубопроводов; инерционность газа при его выпуске из баллона; фактор сжимаемости гелия; нагрев гелия при дросселировании; проникновение уплотняемого давления в зазор между манжетой и стенкой, и ряд других. После чего отклонение расчетных значений давления газа от результатов огневых испытаний составило менее 1% Создана и реализована расчетная методика исследования пневмосистемы на динамическую устойчивость и автоколебания. В методике использованы уточненные результаты гармонической линеаризации для колебаний расхода газа через дроссель и силы трения в манжете, а также новый метод расчета импеданса разветвленной системы трубопроводов. Выведено трансцендентное уравнение для частот и амплитуд свободных нелинейных колебаний системы и предложены методы его решения. Точность определения частот автоколебаний составила 2%. Получены аналитические соотношения для параметров пневмосистемы, обеспечивающие динамическую устойчивость или автоколебания малой амплитуды. Исследованы газодинамические характеристики металлорукава, используемого в дренажной системе лабораторного стенда для исследования и настройки системы. Разработана новая концепция и внедрена конструкция стенда, позволяющая экономить гелий при доводочных испытаниях системы. Выполнено расчетно-экспериментальное исследование системы, а его рекомендации по изменению параметров регулятора, снижающие колебательность и улучшающие другие динамические характеристики, внедрены на двигателе.
The thesis for the scientific degree of the Candidate of Technical Sciences by specialty 05.05.17 – hydraulic machines and hydropneumatic units. – National Technical University "Kharkiv Polytechnic Institute", Kharkiv, 2017. The dissertation describes research of perfected pneumatic starting system of a main restartable liquid-propellant rocket engine destined for a launch vehicle upper stage. The starting system, which structure includes a part of the engine pneumatic unit, performs turbopump spin-up by supplying compressed helium to its turbine. A feature of the system is application of a pneumatically controlled helium pressure regulator. New complex of discrete-continual mathematical models is developed and implemented in the designing practice for the gas-dynamic analysis of this pneumatic system and analysis of friction forces and gas leaks through fluoroplastic lip-type seals of regulators. New computational method is proposed for the developed system’s dynamic stability research. The gas-dynamic characteristics of a metal hose are researched. New concept of the laboratory stand is developed and implemented to enable helium saving at development tests. Experimental-computational research of the pneumatic system is performed, recommendations of which are introduced into the engine in relation to the regulator parameters reducing oscillations and improving other dynamic characteristics.
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O'Dowd, Devin Owen. « Aero-thermal performance of transonic high-pressure turbine blade tips ». Thesis, University of Oxford, 2010. http://ora.ox.ac.uk/objects/uuid:e7b8e7d0-4973-4757-b4df-415723e7562f.

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Yang, Jian-Kai, et 楊建楷. « Analysis of the seal leakage of UAV rotary engine ». Thesis, 2014. http://ndltd.ncl.edu.tw/handle/78045495145533649056.

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碩士
國立中興大學
機械工程學系所
102
The purpose of this research is to investigate the effect of leakage the of rotary engine, establish the model of rotary engine, establish a testing platform to carry out the leakage measurement, analyze the heat transfer and performance of rotary engine. This research analyze the leakage of apex seal and side seal and collect information on seal design by patent analysis. The model of the rotary engine establish and the measured data of leakage will be used for comparison to valid this model. Using the comparison result to calculate clearance of the seal. This research do the rotary engine static testing. First, fix the rotor in different section. Then, addition high pressure air into the combustion chamber and using the pressure sensor measure the change of the pressure. Finally, according to the measure data to evaluate the level of leakage and calculate the clearance of the seal. This research analyze the heat transfer performance of a rotary engine. The whole engine case was divided into 12 parts, and evaluated for each part with the estimated gas temperature. It was found the wall temperature . This research investigate the effect of parameters including altitude, air fuel ratio, spark advance angle, inlet pressure, compression ratio, and sealing.
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Livres sur le sujet "ENGINE LEAKAGE"

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M, Steinetz Bruce, et United States. National Aeronautics and Space Administration., dir. Engine panel seals for hypersonic engine applications : High temperature leakage assessments and flow modelling. [Washington, DC] : National Aeronautics and Space Administration, 1992.

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P, Proctor Margaret, et United States. National Aeronautics and Space Administration., dir. JTAGG II brush seal test results. [Washington, DC] : National Aeronautics and Space Administration, 1997.

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M, Smith L., et United States. National Aeronautics and Space Administration., dir. Final report for grant titled : SSME propellant path leak detection real-time. [Washington, DC : National Aeronautics and Space Administration, 1994.

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United States. National Aeronautics and Space Administration., dir. Final technical report on the development of a solid-state hydrogen sensor for rocket engine leakage detection. [Washington, DC : National Aeronautics and Space Administration, 1994.

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Texas A & M University. Turbomachinery Laboratories. et United States. National Aeronautics and Space Administration., dir. SSME seal test program : Test results for hole-pattern damper seals : interim progress report. College Station, Texas : Turbomachinery Laboratories, Mechanical Engineering Department, Texas A&M University, 1985.

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Childs, Dara W. SSME seal test program : Test results for smooth, hole-pattern, and helically grooved stators : interim progress report. College Station, Tex : Texas A&M, Turbomachinery Laboratories, Mechanical Engineering Dept., 1987.

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JTAGG II brush seal test results. [Washington, DC] : National Aeronautics and Space Administration, 1997.

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Chapitres de livres sur le sujet "ENGINE LEAKAGE"

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Soto-Barrón, Félix Omar, Martín García-Pérez, Guillermo Urriolagoitia-Sosa, Beatriz Romero-Ángeles, Antonio Hernández-Cerón, Diego Sabas-Gonzalez, José Luis Reyes-Reyes, Martín Guzmán-Baeza et Belén Alejandra Contreras-Mendoza. « Numerical-Experimental Analysis of the Sealing Efficiency Utilizing Stresses Produced to an Engine Gasket Manufactured by CRS of ¼ Hardness with a Nitrile Coating on Both Sides ». Dans Proceedings of the XV Ibero-American Congress of Mechanical Engineering, 175–81. Cham : Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-38563-6_26.

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AbstractThe evaluation of a cold assembled engine gasket provides data to analyze if a new design complies with requirements. The main cause of damage is the working temperature. High temperatures are due to refrigerant leakage. In addition to sealing the cylinder, the head gasket seals water and oil passages between the head and the block, preventing engine failure. Different gaskets will fail at different temperature ranges and this is relevant for the structural analysis of the engine. The durability of the gasket and its ability to seal the engine in all condition makes the design a challenge. The non-uniform thermal expansion of the motor makes difficult to design a uniform bead height in the gasket. This makes necessary to include a temperature map in all 3D analyses. This work shows the thermal analysis of an engine head gasket with prestressing of the assembly bolts, the results guarantee an efficient sealing and optimal operation.
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Jafari, Seyed Mohammad, Hamid Mehdigholi et Mehdi Behzad. « Experimental Measurement and Theoretical Modeling of Internal Combustion Engine Valve Leakage by Acoustic Emission Method ». Dans Lecture Notes in Mechanical Engineering, 309–21. Cham : Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-06966-1_29.

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Ohkawa, Satoshi, Hidekazu Nishimura et Yoshiaki Ohkami. « Decomposition Analysis Resolution Process (DAR) of Systems Engineering Applied to Development of Countermeasure on Leakage of Engine Head-Gasket ». Dans IFIP Advances in Information and Communication Technology, 181–92. Berlin, Heidelberg : Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-662-45937-9_19.

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Yu, Yonghua, Pengfei Ji et Jianguo Yang. « Experimental Research on Diagnosis of Valve Leakage for Diesel Engines Based on Acoustic Emission ». Dans Lecture Notes in Mechanical Engineering, 687–96. Cham : Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-09507-3_59.

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Czech, Piotr. « Identification of Leakages in the Inlet System of an Internal Combustion Engine with the Use of Wigner-Ville Transform and RBF Neural Networks ». Dans Telematics in the Transport Environment, 414–22. Berlin, Heidelberg : Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-34050-5_47.

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Khan, Bilal Ahmad. « State of Economic Growth and Development ». Dans Jammu & ; Kashmir, 45–72. Oxford University Press, 2022. http://dx.doi.org/10.1093/oso/9780192849656.003.0002.

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J&K State is lagging behind in diversified economic structure; as such the state economy is mostly dependent on Agriculture sector. Situation is not any better in primary sector where the proportion of net area sown to the total cropped area, average yield per hectare of land, and production of food grains has been stagnant through 80s and much of the 90s. And from the last fifteen years it has been declining. This has created a situation where the imports constitute 80 per cent of the SDP which makes massive leakage effect leading to present crisis. Prior to the turbulent period, the J&K economy was primarily based on agriculture and the service sector was dominated only by tourism. Tourism was identified as the engine of growth and development. However, militant activities since 1989 onwards, there was a colossal setback of it. History bears witness to the fact that whenever and wherever militancy or political instability found roots, the economy of that region became a major causality.
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Actes de conférences sur le sujet "ENGINE LEAKAGE"

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Heppner, Joshua D., David C. Walther et Albert P. Pisano. « Leakage Flow Analysis for a MEMS Rotary Engine ». Dans ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-41868.

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An internal leakage flow analysis is presented for a MEMS fabricated rotary engine in order to establish design parameters for micro engine sealing systems. This research is part of the MEMS Rotary Engine Power System (REPS) group effort to develop a portable power system based on an integrated generator and Wankel rotary internal combustion engine. In order to have acceptable system efficiency, it is necessary to suppress internal leakage and thereby maintain a critical level of compression ratio. There are two inherent leakage paths in rotary engines, which result in blowby and reduced compression ratio: leakage around the apexes of the rotor and leakage across the rotor faces. These sealing issues arise due to the large pressure gradients, which occur along these leakage paths in the combustion chamber. It is the aim of this work to examine the effects of reduced scale on both traditional and novel rotary engine apex sealing mechanisms. In contrast to the macro scale, viscous forces have an increased importance in micro scale engines since Re~.01. A simplified Poiseuille-Couette flow model has been developed to analyze the leakage flows of rotary type engines. Since the Reynolds number for the MEMS REPS is extremely small, the model assumes that the flow is laminar, viscous, incompressible, and steady with air as the working fluid. The model indicates that if a 1 μm gap can be maintained between the housing and moving parts (rotor apexes and faces), leakage flows at expected engine operation speeds will only reduce the compression ratio from 8.3:1 to 6.1:1 so long as the rotation speed is greater than 10,000 rpm. It is doubtful that a traditional or simple micromachine design will yield such a gap and therefore several novel, integrated sealing approaches are under investigation. The model will determine design specification for one of these approaches, an integrated cantilever flexure apex. In conjunction with the theoretical model, a scaled engine experiment at the macro scale is used to verify the modeling effort. The scaling of the experiment complies with Reynolds scaling and ensures that Hele-Shaw flow within the leakage paths is maintained. The experiment does not operate as a functional engine, rather the experiment is designed to maintain a precise clearance between the rotor and housing. In order to preclude additional pressure driven flow effects, an electric motor is used to spin the rotor and simulate the rotation expected due to the combustion pressure acting on the rotor face.
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Kapusuz, E., et B. Ekici. « Evaluation of the Effect of Gas Leakage on Operation of an Optical Engine ». Dans ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2010. http://dx.doi.org/10.1115/esda2010-25076.

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An experimental and numerical study is carried out to evaluate the significance of gas leakage for a non-lube optically accessible internal combustion engine and to obtain estimation for the gas flow out of the combustion chamber at each engine cycle and its effect on the in-cylinder component states during optical engine’s operation. Attention is paid to blow-by and circumferential flow through the gaps between the piston rings and the liner. Optical engines are typically operated without lubrication to avoid window fouling and generation of fluorescence by oil particles that interfere with laser diagnostic signals, in view of this circumstance significant blow-by is expected in optical engines due to lack of “wet-seal” on the cylinder walls which permits circumferential flow of gases through the piston ring pack region resulting in increased blow-by. Semi analytical model estimating the mass loss rate is incorporated into zero dimensional thermodynamic IC engine model which simulates in-cylinder processes. Predicted results are compared for leaking and non-leaking engine simulations.
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Jarrabet, G. P., et L. Lu. « Low Leakage Fiber Metal Seals ». Dans ASME 1992 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/92-gt-141.

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To improve compressor efficiency, gas turbine engine manufacturers have focused on the need for impermeable low leakage rub strip seal materials. Rub strips are used for clearance control between rotating and stationary components in gas turbine engine compressors and turbines. Fiber metal materials are used in many clearance control seal applications and offer suitable rub characteristics, erosion resistance and temperature capability. The excellent abradability characteristics are related to the seal’s high pore volume of many small but interconnected and open pores. A ceramic foam compositing process was developed for incorporating a closed cell foam into the fiber metal structure. This composite seal material achieves the low leakage needs of advanced engines. The properties of abradability, erosion resistance, oxidation resistance, and low weight inherent in fiber metal compressor seals are maintained. The seals are fabricated by brazing preformed rub strips to backing rings and final machining. Seal fabrication uses conventional processing. The low leakage composite rub strip is an innovative approach to improving compressor efficiency that offers a combination of desirable properties in a seal material.
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Wang, Simon S., et Yingjie Lin. « Feasibility of Detecting Antifreeze Leakage in Diesel Engine Oils ». Dans SAE 2006 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States : SAE International, 2006. http://dx.doi.org/10.4271/2006-01-0703.

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Howe, H., G. Jarrabet, L. Lu et R. Tolokan. « Advanced engine seals for low leakage and long life ». Dans 30th Joint Propulsion Conference and Exhibit. Reston, Virigina : American Institute of Aeronautics and Astronautics, 1994. http://dx.doi.org/10.2514/6.1994-2805.

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Meernik, Paul R., et Alex C. Alkidas. « Impact of Exhaust Valve Leakage on Engine-Out Hydrocarbons ». Dans International Fuels & Lubricants Meeting & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States : SAE International, 1993. http://dx.doi.org/10.4271/932752.

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Zhang, Guangde, Caixia You, Weihua Wang, Lu Xie et Jing Sun. « Study on Strategies of Anti-Wear and Leakage for Fuel Injection System of Dimethyl Ether (DME) Engine ». Dans 2012 Small Engine Technology Conference & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States : SAE International, 2012. http://dx.doi.org/10.4271/2012-32-0073.

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Proctor, Margaret P., et Irebert R. Delgado. « Leakage and Power Loss Test Results for Competing Turbine Engine Seals ». Dans ASME Turbo Expo 2004 : Power for Land, Sea, and Air. ASMEDC, 2004. http://dx.doi.org/10.1115/gt2004-53935.

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Advanced brush and finger seal technologies offer reduced leakage rates over conventional labyrinth seals used in gas turbine engines. To address engine manufactures’ concerns about the heat generation and power loss from these contacting seals, brush, finger, and labyrinth seals were tested in the NASA High Speed, High Temperature Turbine Seal Test Rig. Leakage and power loss test results are compared for these competing seals for operating conditions up to 922 K (1200 °F) inlet air temperature, 517 KPa (75 psid) across the seal, and surface velocities up to 366 m/s (1200 ft/s).
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Mori, Goich, Takashi Umeki, Yoshinobu Ueno et Tetsu Ohishi. « Engine Valve Stem Seal, Oil Leakage Control Technology and Performance ». Dans International Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States : SAE International, 1996. http://dx.doi.org/10.4271/960208.

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Buntain, Nick, et Kathryn Lueders. « Orbital maneuvering subsystem engine propellant leakage ball-valve shaft seals ». Dans 35th Joint Propulsion Conference and Exhibit. Reston, Virigina : American Institute of Aeronautics and Astronautics, 1999. http://dx.doi.org/10.2514/6.1999-2763.

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Rapports d'organisations sur le sujet "ENGINE LEAKAGE"

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Jeng, Dun-Zen, Ming-June Hsieh, Chih-Chuan Lee et Yu Han. The Numerical Investigation on the Performance of Rotary Engine with Leakage, Different Fuels and Recess Sizes. Warrendale, PA : SAE International, octobre 2012. http://dx.doi.org/10.4271/2012-32-0057.

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Jeng, Dun-Zen, Ming-June Hsieh, Chih-Chuan Lee et Yu Han. The Numerical Investigation on the Performance of Rotary Engine with Leakage, Different Fuels and Recess sizes. Warrendale, PA : SAE International, octobre 2013. http://dx.doi.org/10.4271/2013-32-9160.

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CAE Correlation of Sealing Pressure of a Press-in-Place Gasket. SAE Imposter, avril 2021. http://dx.doi.org/10.4271/2021-01-0299.

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The Press-in-Place (PIP) gasket is a static face seal with self-retaining feature, which is used for the mating surfaces of engine components to maintain the reliability of the closed system under various operating conditions. Its design allows it to provide enough contact pressure to seal the internal fluid as well as prevent mechanical failures. Insufficient sealing pressure will lead to fluid leakage, consequently resulting in engine failures. A test fixture was designed to simulate the clamp load and internal pressure condition on a gasket bolted joint. A Sensor pad using TEKSCAN equipment was used to capture the overall and local pressure distribution of the PIP gasket under various engine loading conditions. Then, the Sensor pad test results were compared with simulated CAE results from computer models. Through the comparisons, it is found that the gasket sealing pressure of test data and CAE data show good correlation for bolt load condition 500N when compared to internal pressure side load condition of 0.138 MPa & 0.276 MPa. Moreover, the gasket cross-sectional pressure distribution obtained by experimental tests and CAE models correlated very well with R2 ranging from 90 to 99% for all load cases. Both CAE and Sensor pad test results shows increase in sealing pressure when internal side pressure is applied to the gasket seal.
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