Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 111 for “"Gas turbine engines"”.
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Linear and Nonlinear Modelling of Gas Turbine Engines
… flow and shaft speeds of a Rolls Royce aircraft gas turbine. It is motivated by the desire to exploit recent advances in modelling linear and nonlinear systems and the need to investigate the suitability of various model representations in nonlinear gas turbine modelling.<br/><br/>The first part …
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Post-combustion emissions control for aero-gas turbine engines
… that the trend towards smaller engine cores (gas generators) that are power dense and contribute little to the thrust output presents new opportunities for emissions control that were previously unthinkable when the core exhaust stream contributed significant thrust. This thesis proposes and …
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An optimized product development process for aircraft gas turbine engines
Thesis (S.M.)--Massachusetts Institute of Technology, System Design & Management Program, 2003.
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Dynamic Response and Containment of Blade Shedding in Gas Turbine Engines
… the problem of blade shedding in aviation gas turbine engines (GTE) is investigated analytically, numerically and experimentally. The work is divided into three integrated sections. The first is concerned with the dynamic response of traditional metallic blades and advanced metal matrix …
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The design of low-leakage modular regenerators for gas-turbine engines
… 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 …
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An Investigation of Cooling Configurations in Gas Turbine Engines Using Jet Impingement
<p>A numerical investigation for predicting the heat transfer effects of turbulence was conducted by making a scaled-up model of a section in a jet impingement channel. Different turbulence models were run and the results were compared to experimental data. Experimental comparisons were made for …
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Design and Benchmarking of a Combustor Simulator Relevant to Gas Turbine Engines
… in the flow and thermal fields exiting real gas-turbine combustors. The design of the combustor simulator required analyses of the flow paths within a real combustor in a gas turbine engine. Modifications were made to an existing wind tunnel facility to allow for the installation of the …
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A system identification technique for predicting transient operation of gas turbine engines
… for developing transient, predictive models of gas turbine engine performance using system identification techniques in conjunction with test cell data has been successfully demonstrated. Test cell data were obtained for both transient and steady-state operation from two F402-RR-406A USMC AV-8B …
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The influence of fuel properties on threshold combustion in aviation gas turbine engines
… of alternative jet fuel properties on aviation gas turbine performance at threshold combustor operating conditions. It focused on altitude blowout performance and was in part motivated by results that were encountered during an aviation industry evaluation of synthetic kerosene that complied …
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Development and assessment of a soot emissions model for aircraft gas turbine engines
… emissions for current and future aircraft gas turbine engines under different design and operating assumptions. A method for NOx and CO emissions was developed in a previous research effort. This thesis focuses on the addition of a soot mechanism to the existing model. The goal is to …
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Sustainment of commercial aircraft gas turbine engines : an organizational and cognitive engineering approach
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2003.
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A system study on the use of aspirated technology in gas turbine engines
… aircraft engine efficiency and reducing the engines weight have driven innovation in the aircraft engine business since its inception. By simply looking at the Brayton cycle increasing the compressor pressure ratio can bring about an increase in efficiency. To achieve this high pressure …
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Adiabatic Effectiveness Measurements of Leakage Flows along the Hub Region of Gas Turbine Engines
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 …
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Investigation on new low cost electronically controlled fuel metering systems for small gas turbine engines
… controlled fuel metering systems for small gas turbine engines, particularly applicable in remotely piloted vehicles. The first one incorporates a diaphragm operated flat-seat bypass valve to maintain a constant differential pressure across the metering valve, which is actuated by a digital …
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An Investigation of Distortion Indices for Prediction of Stalling Behavior in Aircraft Gas Turbine Engines
… indices to predict stalling behavior in aircraft gas turbine engines was investigated using J85-GE-13 turbojet engine data, TF30-P-3 turbofan engine data, and modified T64-GE-6B compressor test-rig data. The indices were tested for correlation capability with constant speed loss in stall pressure …
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Modeling the evolution of trace species in the post-combustor flow path of gas turbine engines
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2000.
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Acoustic Transfer Functions Derived from Finite Element Modeling for Thermoacoustic Stability Predictions of Gas Turbine Engines
… for Thermoacoustic Stability Predictions of Gas Turbine Engines Design and prediction of thermoacoustic instabilities is a major challenge in aerospace propulsion and the operation of power generating gas turbine engines. This is a complex problem in which multiple physical systems couple …
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The Development of an Accelerated Testing Facility for the Study of Deposits in Land-Based Gas Turbine Engines
<p>Turbine engine efficiency modeling depends on many parameters related to fluid dynamics and heat transfer. Many of these parameters change dynamically once the engine enters service and begins to experience surface degradation. This thesis presents a validation of the design and operation of an …
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Stress and Damage Analyses of Thermal Barrier Coatings Under Cyclic Thermal Loading Conditions
… can significantly limit their applications in gas turbine engines. The delamination of TBCs occurs typically at interfaces between the top coat and bond coat due to thermal mismatch stress via both crack nucleation and propagation and decohesion. In this thesis, this phenomenon was studied …
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Type 1 hot corrosion furnace testing and evaluation.
… if type 1 hot corrosion seen in operating gas turbine engines and burner rigs could be more simply reproduced. Furnace parameters were varied to determine optimum (most aggressive) values for a short term type 1 hot corrosion test. The results of these tests were ranked and compared to data …
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