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 19 of 19 for “"Gas turbine combustion"”.
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Impact of alternative jet fuels on gas turbine combustion systems
… what fuel properties rate-limit the combustion process across a variety of engine-relevant operating conditions can dramatically shorten fuel certification times and decrease testing costs. The central objective of this work is to determine which fuel properties govern whether …
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Modeling Hydrodynamic Stability of Incline-Liquid Airblast Nozzle for Gas Turbine Combustion
… fuel and air is a critical process for optimum combustion in gas turbine engines due to its high influence on the downstream combustion process. The need for minimizing fuel consumption coupled with the requirement for combustion systems to perform well at all flight conditions puts the …
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Study of alternative jet fuel ignition behavior in gas turbine combustion environments
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-05-01
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Thermal design and analysis of a recuperative combustor for gas-turbine combustion
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1993.
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Investigation of alternative jet fuels in gas turbine combustion systems using x-ray radiography
… affect the atomization, vaporization, and combustion process of jet fuels and ascertain which properties determine if an alternative fuel will behave similarly to conventional jet fuel. In this work, x-ray phase-contrast imaging is performed at 90,517 Hz on a combusting fuel spray in a …
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A Thermoacoustic Characterization of a Rijke-type Tube Combustor
… community, can cause extensive damage in gas turbine combustion chambers. To understand the phenomena related to thermoacoustics, a simple Rijke-type tube combustor was built and studied. Extensive experimental results, as well as theoretical analyses related to the Rijke tube are …
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An investigation into the origin, measurement and application of chemiluminescent light emissions from premixed flames
… CH* and OH* are studied in premixed methane combustion to investigate the possible application of their light emissions in gas turbine combustion monitoring systems. The interpretation of integrated and local chemiluminescence measurements are shown to give important qualitative insights into …
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Nonlinear Control of a Thermoacoustic System with Multiple Heat Sources and Actuators
… lead to unpredictable behavior of the system. Gas-turbine combustion systems are especially prone to this phenomenon reducing their overall efficiency. Additionally, due to the nature of the combustion, the turbines end up releasing undesired amounts of harmful chemicals to the atmosphere, such …
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Combustion Instability Mechanism of a Reacting Jet in Cross Flow at Gas Turbine Operating Conditions
Modern gas turbine designs often include lean premixed combustion for its emissions benefits; however, this type of combustion process is susceptible to self-excited combustion instabilities that can lead to damaging heat loads and system vibrations. This study focuses on identifying a mechanism of …
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A method for the numerical analysis of combustion instabilities with an application to afterburner screech
… damaging thermoacoustic oscillations in gas turbine combustion systems by computational means. A framework is laid out to predict numerically the frequency and stability of thermoacoustic oscillations, with focus on the high frequency screech instability of afterburners. A hybrid …
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Global stability and control of swirling jets and flames
… of many practical flows, such as those found in gas turbine combustion chambers. This thesis is concerned primarily with large-scale unsteady structures that arise due to self-sustained hydrodynamic oscillations, also known as global hydrodynamic instability. Direct numerical simulation (DNS) of …
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Large eddy simulation of primary liquid-sheet breakup
… capability to simulate the fuel injection in gas turbine combustion chambers. The path to this objective started with the review of state-of-the-art numerical techniques to model the primary breakup of liquid fuel into droplets. Based on this and keeping in mind the requirements of the …
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Investigation of a prototype industrial gas turbine combustor using alternative gaseous fuels
In this thesis, the effect of alternative gaseous fuels, with high hydrogen content and lower calorific value, on gas turbine combustion was investigated experimentally. The aim of the investigation was to find operational limitations for an experimental burner and to supply data for validation of …
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Study of Lean Blowout Limits and Effects of Near Blowout Oscillations on Flow Field and Heat Transfer on Gas Turbine Combustor
Modern gas turbine combustors implement lean premixed (LPM) combustion system to reduce the formation of NOx pollutants. LPM technology has advanced to have the ability to produce extremely low level of NOx emissions. The current focus of research on LPM is focused on reducing the NOx emission to …
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Spatially Resolved Analysis of Flame Dynamics for the Prediction of Thermoacoustic Combustion Instabilities
… stringent emissions regulations have led combustion system designers to look for more environmentally combustion strategies. For gas turbine combustion, one promising technology is lean premixed combustion, which results in lower flame temperatures and therefore the possibility of …
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Characterization of compact gas turbine combustors for alternative fuel integration
The student, Eric Wood, submitted this Dissertation for approval on 2023-07-06 at 09:50.
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Thermoacoustic Analysis and Experimental Validation of Statistically-Based Flame Transfer Function Extracted from Computational Fluid Dynamics
… with the Flamelet Generated Manifold (FGM) combustion model are performed and probability density functions (PDFs) of the convective time delay and local heat release rates are extracted. These are then used as inputs to the 1-D Thermoacoustic model. Results are compared with the …
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Laser Induced Incandescence for Volume Fraction and Relative Particle Size Measurements in a Rich-Quench-Lean Jet A Combustor
Reducing the production of nonvolatile particulate matter, which is composed mostly of soot, is an important goal for modern aeroengine combustors. Not only does soot production reduce engine performance, but it also creates unwanted pollution. In order to understand soot production in realistic …