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Rozprawy doktorskie na temat „ENGINE LEAKAGE”

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Data publikacji: 11 września 2023

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Sprawdź 19 najlepszych rozpraw doktorskich naukowych na temat „ENGINE LEAKAGE”.

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1

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 inde
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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-
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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 t
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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.<br>Includes bibliographical references (p. [229]-231).<br>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 (
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Dagson, Josef, and 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 amou
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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
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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 і
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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
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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, and 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<br>國立中興大學<br>機械工程學系所<br>102<br>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
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Hsu, Yu-Lung, and 許右龍. "Analysis of the dynamic Apex seal leakage of Wankel Engine." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/48785485530127813694.

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碩士<br>國立中興大學<br>機械工程學系所<br>103<br>The research investigates the variation of the seal gap and leakage of Wankel engine. A test platform is built to operate Wankel engine without ignition and analyze the performance index of Wankel engine. In the experiment installation, the pressure sensor is installed in the position of spark plug. The servo motor and the driver motivate Wankel engine. The rotation speed is considered as a variable parameter. The volume of the leakage and the variation of the seal gap can be calculated from the cylinder pressure variation, which is related to rotation angle.
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CHEN, KUAN-TING, and 陳冠廷. "Three-dimensional Flow Field Characteristics and Leakage Analysis of Rotor Engine." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/46jbpj.

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碩士<br>國立虎尾科技大學<br>機械與電腦輔助工程系碩士班<br>107<br>In this study, the module of the three-dimensional rotor engine is constructed to analyze and discuss its characteristics. Firstly, the three-dimensional fluid module of the triangular rotor engine is constructed, and the research process is planned. The pre-processing mesh is firstly divided, and the fluid analysis program Fluent is used. Analyze. The flow rate, pressure, leakage, etc. of the gas under the three-dimensional module are observed by different types of fluids. Based on the three-dimensional module of the triangular rotor engine, the model
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13

Chen, Kuan Lin, and 陳冠霖. "Application of Neural networks in Fault Diagnosis of Gasoline Engine－Engine Leakage and Fault Air Flow Signal." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/52038098690782568368.

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碩士<br>南台科技大學<br>機械工程系<br>100<br>In this paper, neural networks are employed to construct a gasoline engine fault diagnostic system including engine-state diagnostic system, fault source diagnostic system, air-flow sensor fault diagnostic system, leaking source diagnostic system, crankcase ventilation system leaking-degree diagnostic system and fuel pressure regulator leaking-degree diagnostic system 　　The running engine is detected using engine-state diagnostic system to identify the state first, if the engine state is abnormal, distinguish the fault source by engine fault source diagnosis sys
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VASHISTHA, ASHISH. "TPM APPROACH FOR ANALYSIS AND REDUCTION IN ENGINE LEAKAGE FROM STATOR PLATE." Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/15030.

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Liu, Chien-Chih, and 劉建志. "Leakage Detection and Dynamic Data Estimation of a Gasoline Engine Using Neural Networks." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/04444743987872009944.

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碩士<br>南台科技大學<br>機械工程系<br>96<br>In this paper, the neural network, the back propagation algorithm and steepest descent method are combined to develop the leakage diagnosis of vacuum pressure of the gasoline engine. The datum of air flow, throttle position, intake manifold pressure and injection time are collected under the normal and leakage conditions. The testing samples are divided into the normal condition, the leakage of crank ventilation and that of fuel pressure regulator. The results indicate that the diagnostic system constructed by the neural network can exactly identify the leakage c
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Lin, Chou-Shih, and 林洲世. "The study of electronic oscilloscope application on engine's intake valve leakage detection." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/39528222476945202889.

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碩士<br>國立中興大學<br>農業機械工程學系<br>89<br>Currently, most of engine technicians utilize the compression pressure meter, vacuum gauge and air flow gauge to diagnose the intake valve leaking problem for four-stroke engines. Using these tools are found either not convenient or less accuracy for minor leakage. The electronic oscilloscope, which is generically equipped in modern automotive workshop, was used in this research associated with the manifold absolute pressure sensor (MAP) installed on modern vehicles to observe the vacuum pulse variation in an intake manifold when a intake valve leak
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Phutthavong, Patricia. "Numerical investigation of the unsteady aerodynamics of blade tip leakage flow inside gas turbine engines." Thesis, 2006. http://spectrum.library.concordia.ca/9053/1/MR20763.pdf.

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In today's modern gas turbine engines, the region between the rotor and the stationary shroud has the most extreme fluid-thermal conditions in the entire turbine, and is characterized by a periodically unsteady three-dimensional flow field. Due to the pressure difference across the blade tip, leakage flow enters the gap region from the pressure side and exits from the suction side. Tip leakage flow consists of hot mainstream gas and is highly undesirable since it does not turn, and so does not produce any work. Also, high heat transfer rates in the tip gap region occur as a result of leakage f
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Rahman, Md Hamidur. "Numerical analysis of blade tip leakage flow and shroud heat transfer in gas turbine engines." Thesis, 2008. http://spectrum.library.concordia.ca/976268/1/MR63240.pdf.

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One of the most critical components of gas turbine engines, rotor blade tip and casing, is exposed to high thermal load. It is a significant challenge to the designer to protect the turbine material from this severe situation. Leakage flow over the blade tip is also one of the important issues to improve the turbine performance. To understand the detailed phenomena and natures of the heat transfer on the turbine blade tip and casing in association with the tip leakage flow under actual turbine operating conditions, both steady and unsteady simulations have been conducted. A single stage gas t
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Chuang, Chu-Chun, and 莊居峻. "Numerical Study on Combustion Performance of Rotary Engines with Different Aspect Ratio of Rotor Recess and with Consideration of Apex Seal Leakage." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/98787153670496456567.

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碩士<br>逢甲大學<br>航太與系統工程所<br>99<br>The purpose of this study is to simulate the flow field of the combustion chamber with considering the effects of the rotor recess configuration and leakage on the flow field inside the combustion chamber by using computational fluid dynamic software, Fluent. The key parameters of this study include arrangement of rotor recess configuration, aspect ratio of rotor recess, and leakage of apex. Firstly, the optimal recess configuration among different configurations including leading, medium, and trailing deep recesses has been determined and then to be the basic c
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