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Dissertations / Theses on the topic '621.435.4'

Author: Grafiati

Published: 30 May 2022

Last updated: 31 July 2025

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1

Бушнов, Валерий Васильевич. "Усовершенствование процессов сгорания и систем топливоподачи энергетических установок, работающих на металлизированных борсодержащих топливах". Thesis, Харьковский национальный автомобильно-дорожный университет, 2017. http://repository.kpi.kharkov.ua/handle/KhPI-Press/26557.

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Диссертация на соискание научной степени кандидата технических наук по специальности 05.05.03 – Двигатели и энергетические установки. – Национальный технический университет "Харьковский политехнический институт". – Харьков, 2017. Диссертация посвящена решению вопросов улучшения характеристик и параметров систем топливоподачи металлизированных топлив на основе выявления физико-технических закономерностей предпламенного окисления и горения таких топлив, а также разработке алгоритма структурно-параметрической оптимизации систем топливоподачи энергетических установок для обеспечения их высокой эф

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2

Бушнов, Валерій Васильович. "Вдосконалення процесів згоряння та систем паливоподачі енергетичних установок, що працюють на металізованих боромістких паливах". Thesis, НТУ "ХПІ", 2017. http://repository.kpi.kharkov.ua/handle/KhPI-Press/26489.

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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.05.03 – Двигуни та енергетичні установки. – Національний технічний університет "Харківський політехнічний інститут". – Харків, 2017. Дисертація присвячена питанням покращення характеристик та параметрів СППМП на основі виявлення фізико-технічних закономірностей горіння металізованих палив і розробки алгоритму структурно-параметричної оптимізації енергетичних установок для забезпечення їх високої ефективності. Проведено дослідження кінетичних характеристик металізованих палив різного складу та виявлені основн

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3

Naeem, Muhamma. "Implications of aero-engine deterioration for a military aircraft's performance." Thesis, Cranfield University, 1999. http://hdl.handle.net/1826/3397.

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World developments have led the armed forces of many countries to become more aware of how their increasingly stringent financial budgets are spent. Major expenditure for military authorities is upon aero-engines. Some in-service deterioration in any mechanical device, such as an aircraft's gas-turbine engine, is inevitable. However, its extent and rate depend upon the qualities of design and manufacture, as well as on the maintenance/repair practices followed by the users. Each deterioration has an adverse effect on the performance and shortens the reliable operational life of the engine ther

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4

Ulizar, Alvarez J. I. "Simulation of multi fluid gas turbines." Thesis, Cranfield University, 1998. http://hdl.handle.net/1826/3537.

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This work focuses on two main subjects: first, the development and validation of a robust generic performance code for industrial gas turbines (GTSI) and, second, the study of an innovative carbon dioxide/argon semi-closed cycle burning low calorific gas coming from coal gasification. GTSI will be able to simulate open, closed and semi-closed cycles at design and off-design conditions. A comprehensive thermodynamic study of the properties of the most common working fluids has been carried out, introducing the results in GTSI for a wide range of temperatures and pressures, being easy to add oth

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5

Engelbrecht, Geoffrey E. "Modelling of premixed combustion in a gas turbine." Thesis, Cranfield University, 1998. http://hdl.handle.net/1826/3987.

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Three steady state combustion models, two turbulence models and a model for tK'6 prediction of NO., were implemented and investigated on a simple backward facing step experiment as well as an experimental lean prevaporised premixed (LPP) combustor. The three combustion models included the simple Eddy Break-up model as well as a presumed probability density function (pdf) model and a form of the BML crossing frequency flamelet model. These models were adapted to consider a variable mixture fraction to account for a non-homogeneous fuel air mixture. The two turbulence models used were the k-e an

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6

Matthews, Alexander J. "Scramjet intakes." Thesis, University of Oxford, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.400217.

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7

Kim, Sogkyun. "Fuzzy modelling and control for gas turbine altitude relighting." Thesis, University of Sheffield, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.421225.

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8

Castres, Fabrice. "Mode detection in turbofan inlets." Thesis, University of Southampton, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.438539.

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9

Fleck, R. "Predicting the performance characteristics of internal combustion engines." Thesis, Queen's University Belfast, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.431397.

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10

Reveille, T. "Study of fuel injection and mixture formation for a gasoline direct injection engine." Thesis, Cranfield University, 2005. http://hdl.handle.net/1826/4288.

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Future requirements for lower automotive emissions have lead to the development of new internal combustion (IC) engine technologies. Gasoline Direct Injection (GDI), for example, is one of these promising new IC engine concepts. It offers the opportunity of increased efficiency through unthrottled operation. However, the realisation of this concept is critically dependent on the in-cylinder mixture formation, especially in the late injection/lean operation mode. Ideally, this would require a precise stratification of the in-cylinder fuel-air mixture in 3 distinct zones: an ignitable pocket loc

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11

Karaiskos, Ilias-Efstratios. "Spray structure and mixture distribution in direct-injection gasoline engines." Thesis, Imperial College London, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.417137.

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12

Cao, Li. "Numerical study of controlled auto-ignition combustion in port and direct fuel injection gasoline engines." Thesis, Brunel University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.422419.

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13

WyszynÌski, Åukasz P. "Investigation of combustion processes in a direct injection spark ignition engine." Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398260.

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14

Ashurst, Colin. "Realising benefits from IS/IT : exploring the practices and competences required to succeed." Thesis, Loughborough University, 2007. https://dspace.lboro.ac.uk/2134/10727.

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The primary driver for this research was the continuing high failure rate of investments in IS/IT which has stayed at around 70-80% for over 30 years. The aim of this research was to explore the extent to which organisations have adopted benefits driven practices when undertaking investments in IS/IT. An initial phase of the research was primarily based on detailed documentation on 25 projects taken from the knowledge management database of an IS/IT consultancy. A second phase comprised in-depth case studies at three organisations. This phase explored the practices adopted on three or four pro

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15

Kalian, Navin. "Investigation of CAI/SI operations ina a four-cylinder direct injection gasoline engine." Thesis, Brunel University, 2006. http://bura.brunel.ac.uk/handle/2438/5482.

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A four-cylinder, four-stroke, gasoline engine with direct injection fuel was commissioned and used to achieve CAI combustion. CAI combustion was achieved by employing short-duration, low-lift camshafts and early exhaust valve closure. Trapping sufficient volumes of exhaust residual provided the necessary thermal energy needed to initiate auto-ignition. The effects of valve opening durations on the CAI operation range were investigated at different air/fuel ratios, valve timings and injection timings. Furthermore the effect on engine performance, exhaust emissions, fuel consumption and combusti

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16

Fleck, B. J. "Computer simulation and evaluation of design parameters in a high performance two-stroke engine." Thesis, Queen's University Belfast, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.411227.

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17

Wang, Shiwei. "Advanced air fuel ratio control of automotive si engines." Thesis, Liverpool John Moores University, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.438766.

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18

Alrefae, Waleed H. "Combustion studies in an optically accessed gasoline direct injection engine." Thesis, University of Leeds, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.439607.

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19

Suyabodha, Apiwat. "Simulation of cyclic variability in gasoline engine under cold start conditions." Thesis, University of Bath, 2012. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.555749.

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Emissions from gasoline engines remain an important issue worldwide as they are both harmful to health and contribute to green house effects especially under cold start conditions. A major challenge of the automotive industry is to reduce harmful emissions as much as possible whilst continuing to reduce CO2 emissions. Three-way-catalytic converters have been used very successfully to convert the harmful gases before release to the environment but these devices have to reach their light-off temperature in order to activate the chemical reactions. Therefore, the conversion time is delayed and du

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20

Loustalan, Paul William. "Experimental investigation of near-nozzle characteristics of gasoline sprays from pressure-swirl atomisers." Thesis, University College London (University of London), 2005. http://discovery.ucl.ac.uk/1444952/.

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This thesis presents an experimental investigation of the near-nozzle region of the fuel spray issuing from a pressure-swirl injector commonly found in a direct injection spark ignition engine. Specifically, the effects of the back pressure and impinging air flows were investigated. In addition to this the effect of fuel pressure was investigated. The literature survey reveals only limited published work on the near-nozzle characteristics of fuel sprays, and the requirement for more detailed knowledge of the area to aid in the general understanding of the topic and the development of mathemati

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21

De, Zoysa Merrenna Manula. "Neural network estimation of air-fuel ratio in internal combustion engines." Thesis, University of Brighton, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399048.

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This thesis presents an investigation into a novel method of estimating the air-fuel ratio of a gasoline-fuelled spark-ignition internal combustion engine. The measurement of the air-fuel ratio is important for controlling an engine to reduce exhaust emissions. In production vehicles, the air-fuel ratio is measured using an exhaust gas analyser and the exhaust emissions are reduced by using electronically controlled three-way catalytic converters, which are expensive and subject to operationallimitations such as, requiring the engine to operate with a stoichiometric air-fuel ratio. A micro-pro

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22

Bale, Christopher J. C. "The application of advanced spark-ignition engine combustion systems for high-performance and a better environment." Thesis, Loughborough University, 2007. https://dspace.lboro.ac.uk/2134/36018.

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This is a thesis that brings together work conducted over a thirty year period concerning the research, development and knowledge management of high perfonnance and low exhaust emission engines. The thesis includes nine published and refereed works that are discussed and appended. Internal combustion engines translate the chemical energy of a fuel into mechanical work by burning the fuel with air in a combustion chamber. It is demonstrated that this process can be improved beneficially with respect to power output, fuel economy and exhaust emissions, by efficient cylinder filling and the gener

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23

Twiney, Benjamin W. G. "Investigation of combustion robustness in catalyst heating operation on a spray guided DISI engine." Thesis, University of Oxford, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558407.

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The cold start catalyst warm-up operation is seen as one of the most important modes in Direct Injection Spark Ignition (DISI) Engine operation. When the catalyst is cold the engine out emissions become the tailpipe out emissions, so it is vital for the catalyst to obtain its working temperature as quickly as possible. A very high exhaust temperature can be achieved with a very retarded ignition - the engine can be made to operate at no load with a close to wide open throttle. With a retarded ignition, a split injection strategy has been shown to improve combustion stability which is critical

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24

Smith, Oliver Mark Edward. "In-cylinder fuel and lubricant effects on gasoline engine friction." Thesis, University of Leeds, 2007. http://etheses.whiterose.ac.uk/4716/.

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The purpose of the research reported in this thesis was to investigate the viability and quantify the potential gains of improving fuel economy of the gasoline engine through strategic application of additives. An increased awareness of the link between greenhouse gas emissions and global warming means that there is a desire to reduce carbon dioxide emissions from transportation. There is therefore a growing emphasis on improving the fuel economy performance of vehicles. The addition of friction modifier additives to the fuel is one way to achieve this. Using bespoke in-cylinder sampling techn

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25

Mufti, Riaz Ahmad. "Total and component friction in a motored and firing engine." Thesis, University of Leeds, 2004. http://etheses.whiterose.ac.uk/5354/.

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Engine developers and lubricant formulators are constantly improving the performance of internal combustions engines by reducing the power losses and emissions. The majority of the mechanical frictional losses generated in an engine can be attributed to the main tribological components of an engine, the valve train, piston assembly and engine bearings. However no single method has been developed to measure the friction loss contribution of each component simultaneously in a firing engine. Such results would be invaluable to the automotive/lubricant industries, research institutions and for val

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26

Mohamed, Caroline. "Autoignition of hydrocarbons in relation to engine knock." Thesis, University of Leeds, 1997. http://etheses.whiterose.ac.uk/4197/.

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A single piston Rapid Compression Machine (RCM) has been used to investigate the autoignition of hydrocarbons under conditions of temperature and pressure similar to those which occur in the end-gas of a spark-ignition engine under knocking conditions. Extents of reactant consumption have been measured during the course of autoignition following rapid compression of hydrocarbon-air mixtures. Evidence for the occurrence of low temperature oxidation during the compression stroke has been found and its effect on the overall ignition delay has been determined by numerical methods. The influence of

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27

Murad, Ahmad E. M. A. "Flow and combustion in disc and pent-roof SI engines." Thesis, University of Leeds, 2006. http://etheses.whiterose.ac.uk/5392/.

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Reported in this thesis is a study of combustion in a disc-shaped combustion chamber spark ignition engine, and in-cylinder flow and combustion in an idealised pent-roof spark ignition engine. Both engines were skip fired, to remove residuals and ensure a welldefined in-cylinder fuel-air mixture. Other important parameters were also controlled, e.g. inlet temperature, inlet pressure, air mass flow, mixture strength, engine speed and spark timing. With the disc-shaped spark ignition engine, a shadowgraph technique was used to study early flame development. Simultaneous natural light and shadowg

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28

Attia, Osama Abdel Moniem Mohamied. "Finite element static, dynamic, and flutter analysis of rotating composite layered plates and shells." Thesis, Cranfield University, 1996. http://hdl.handle.net/1826/4052.

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This thesis introduces new conforming and non-conforming finite elements for the static and dynamic analysis of rotating composite layered plates and shells. The elements consider parabolic distributions of transverse shear stresses, and based on Lagrangian and Hermitian shape functions. They can deal with variable thickness distributions as well as uniform distributions, and they are fully capable to deal with rotating plate and shell structures, i. e. centrifugal stiffening and Coriolis force effects are considered. Natural frequency analysis, forced vibration analysis, and flutter analysis

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29

Fowler, Andrew. "A new advanced turbine-stage test facility : the concept, design, construction and commissioning." Thesis, University of Oxford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386786.

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30

Nikpour, B. "Measurement of the performance of a radial inflow turbine." Thesis, University of Manchester, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282899.

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31

Robotham, William. "The elastic-plastic buckling behaviour of shafts." Thesis, University of Nottingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323611.

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32

Lucas, Simon Charles. "Higher specific speed impulse turbines." Thesis, University of Reading, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270200.

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33

Hughes, Adam William. "Investigation of tip-driven thruster and waterjet propulsion systems." Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322015.

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34

Dunkley, Michael John. "The aerodynamics of intermediate pressure turbines." Thesis, University of Cambridge, 1998. https://www.repository.cam.ac.uk/handle/1810/272045.

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35

Gostelow, J. P. "Publications in turbomachinery aerodynamics and related fields." Thesis, University of Liverpool, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384347.

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36

Dennis, C. W. "A Study of Rocket Exhaust Particles." Thesis, Cranfield University, 1996. http://hdl.handle.net/1826/3583.

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The exhaust -plumes generated by rocket motors are of significant military importance for missile detection, recognition and communication due to their electromagnetic emission and propagation properties. The plume is a high temperature, high velocity stream of gas and particles, into which the surrounding air is entrained. With improvements in the modelling of plume gas chemistry and turbulence, particles present in the plume have become more important in the computational prediction of the plume's flow field, and the subsequent prediction of plume emission and propagation characteristics. Th

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37

Knife, S. "Propulsion system safety analysis methodology for commercial transport aircraft." Thesis, Cranfield University, 1997. http://hdl.handle.net/1826/4256.

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Airworthiness certification of commercial transport aircraft requires a safety analysis of the propulsion system to establish that the probability of a failure jeopardising the safety of the aeroplane is acceptably low. The needs and desired features of such a propulsion system safety analysis are discussed, and current techniques and assumptions employed in such analyses are evaluated. It is concluded that current assumptions and techniques are not well suited to predicting behaviour of the propulsion system in service. The propulsion accident history of the high bypass ratio commercial trans

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38

Robinson, Christopher J. "End-wall flows and blading design for axial flow compressors." Thesis, Cranfield University, 1991. http://dspace.lib.cranfield.ac.uk/handle/1826/6929.

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The flow in multistage axial flow compressors is particularly complex in nature because of the proximity of moving bladerows, the growth of end-wall boundary layers and the presence of tip and seal leakages and secondary flow. The problems associated with these phenomena are at their most acute in the latter, subsonic stages of the core compressor, where Reynolds numbers are modest and the blading has low aspect ratio. Indeed, much of the inefficiency of axial stages is believed to be associated with the interaction between blading and end-wall flows. The fact that the end-wall flow phenomena

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39

Addison, John Stephen. "Wake-boundary layer interaction in axial flow turbomachinery." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357704.

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40

Dorrington, Graham Edward. "Performance of earth-to-orbit transports breathing air." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.277797.

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41

Leontopoulos, Chris. "Vibration analysis for the design on a turbo-generator based powertrain for hybrid vehicles." Thesis, Imperial College London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284809.

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42

Brayton, Simon Nicholas. "Hot wire instrumentation for unsteady aerodynamic measurements in a rotating gas turbine stage." Thesis, University of Oxford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390399.

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43

Kuk, Victor H. M. "An investigation of particle trajectories and particle impact points in turbine film cooling hole system." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294380.

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44

Slater, J. T. D. "Three-dimensional aerodynamic studies of a turbine stage in a transient flow facility." Thesis, University of Oxford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358729.

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45

Nascimento, M. A. R. "The selective bleed variable cycle engine." Thesis, Cranfield University, 1992. http://dspace.lib.cranfield.ac.uk/handle/1826/7359.

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A new concept in aircraft propulsion is described in this work. In particular, variable jet engine is investigated for supersonic ASTOVL aircraft. This engine is a Selective Bleed Variable Cycle, twin shaft turbofan. At low flight speeds the engine operates as a medium bypass turbofan. At supersonic cruise it operates as low bypass turbofan without reheat. The performance of the engine and its components is analyzed using a novel matching procedure. Off-design engine performance characteristics are explained, compressor running lines are shown, and variable geometry requirements are described

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46

Rolston, Stephen Carson. "An application of passive control for supersonic sidewall intakes." Thesis, Queen's University Belfast, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359123.

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47

Al-Ajmi, Rashed. "Evaluation of vortex cooling systems for turbine blades." Thesis, Cardiff University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364475.

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48

Isaias, Loizos. "Performance simulation of a medium speed diesel engine under optimal and fault conditions." Thesis, University of Newcastle Upon Tyne, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388759.

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49

Zhou, Ji. "Intelligent fault diagnosis with applications to gas turbine engines." Thesis, University of Sheffield, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284354.

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50

Sellers, Jerry Jon. "Investigation into hybrid rockets and other cost-effective propulsion system options for small satellites." Thesis, University of Surrey, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309201.

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