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 28 for “"gas turbine combustor"”.
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Transfer function of heavy duty gas turbine combustor components.
Thesis: M.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1978
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Acoustic boundary condition estimation in a near-scale gas-turbine combustor
… dynamic pressure measurements obtained during combustor operation, and a finite element method-based model of the combustion chamber. Results of a theoretical analysis are presented which show that the method is capable of accomplishing its mission. An observation of particular significance is …
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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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Modeling and Stability Analysis of Thermoacoustic Instabilities in Gas Turbine Combustor Sections
… of combustion systems in industrial-scale gas turbines, a stability analysis was completed using models generated for each of the major dynamic components. Changes in the combustion process of gas turbines to reduce emissions has resulted in large amplitude pressure oscillations associated …
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Linear Modeling and Analysis of Thermoacoustic Instabilities in a Gas Turbine Combustor
… an industrial-scale, swirl-stabilized premixed combustor located at the National Energy Technology Laboratory (NETL) in Morgantown, WV. The model consists of modular blocks that assemble into an open-loop transfer function depicting the frequency response of the thermoacoustic system. These …
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Experimental Investigation of a Lean, Premixed Gas Turbine Combustor Using Advanced Laser Diagnostics
… equivalence ratios, 0.6 and 0.7, and two combustor pressure drops, 3% and 5%. Time-resolved images were acquired at two axial locations for each test condition, revealing a combustion flow field dominated by large-scale turbulent structures. Stabilization of the flame occurred primarily in …
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Application of a modified k-[epsilon] turbulence model to gas turbine combustor geometries
… recirculating flows, which are characteristic of combustor geometries. Y. S. Chen and S. W. Kim propose a modification to the k-epsilon turbulence model which has shown improved predictions for several complex flows. This study evaluates the application of the Chen modification of the k-epsilon …
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Fuel/air Mixing and Nitrogen Oxide Formation in a Lean Premixed Gas Turbine Combustor
… engine-out NOx concentrations for lean premixed combustors. The CRM model only requires information regarding the reactor loading, the combustor inlet state, and the combustor geometry. Model improvements were obtained by including the effects of reactant unmixedness based on the fuel/air …
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Experimental Study of the Effect of Dilution Jets on Film Cooling Flow in a Gas Turbine Combustor
Cooling combustor chambers for gas turbine engines is challenging because of the complex flow fields inherent to this engine component. This complexity, in part, arises from the interaction of high momentum dilution jets required to mix the fuel with effusion film cooling jets that are intended to …
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An Experimental Investigation into NOx Control of a Gas Turbine Combustor and Augmentor Tube Incorporating a Catalytic Reduction System
… engine test cell environment. A modified T-63 gas turbine combustor and an augmentor tube, 21 feet in length and containing a perlite catalyst, were used as a gas generator and catalytic reduction system. Four data runs were made. Three runs were completed without the catalyst installed. …
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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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A physics-based emissions model for aircraft gas turbine combustors
… thesis, a physics-based model of an aircraft gas turbine combustor is developed for predicting NO. and CO emissions. The objective of the model is to predict the emissions of current and potential future gas turbine engines within quantified uncertainty bounds for the purpose of assessing …
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Heat Transfer and Flow Measurements in an Atmospheric Lean Pre-Mixed Combustor
… have driven the development of low-emission gas turbine engines, operating at lean equivalence ratios and at increasingly higher turbine inlet temperatures. This has placed new constraints on gas turbine combustor design, particularly in regards to the cooling technologies available for the …
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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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Experimental Investigation of Flow and Wall Heat Transfer in an Optical Combustor for Reacting Swirl Flows
… and heat transfer characteristics inside a gas turbine combustor provides one of the most serious challenges for gas turbine researchers because of the harsh environment at high temperatures. Design improvements of gas turbine combustors for higher efficiency, reduced pollutant emissions, …
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Investigation of alternative jet fuels in gas turbine combustion systems using x-ray radiography
… Hz on a combusting fuel spray in a realistic gas turbine combustor, allowing characterization of breakup process of fuel into ligaments and then individual droplets as it leaves a nozzle. This imaging is performed on two different fuels: Jet-A (A-2), which represents a fuel with standard …
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Flow Field Computations of Combustor-Turbine Interactions in a Gas Turbine Engine
The current demands for higher performance in gas turbine engines can be reached by raising combustion temperatures to increase thermal efficiency. Hot combustion temperatures create a harsh environment which leads to the consideration of the durability of the combustor and turbine sections. …
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Heat Transfer and Flow Measurements on a One-Scale Gas Turbine Can Combustor Model
… cooling as the solution for modern DLE combustors. The idea is to provide more cooling to the deserved local hot spots and reserve unnecessary coolant air from local cold spots. Therefore, if accurate heat load distribution on the liners can be obtained, then an intelligent cooling …
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Flow Field and Soot Formation Characteristics in Swirl-stabilized Non-premixed Turbulent Flames
… flames were confined and stabilized in a model gas turbine combustor with a swirl number of ~0.55. Soot volume fraction, fv, and primary soot particle size, dp, were measured using auto-compensating laser-induced incandescence, and planar three-component velocity fields were measured using …
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Modeling Three Reacting Flow Systems with Modern Computational Fluid Dynamics
… modifying modern PCGC-3 coal combustion and gasification models so that they could be incorporated into STAR-CD. Models implemented included a coal set-up subroutine, and coal reactions models for devolatilization, char oxidation, and vaporization. Each implemented model was tested to verify …
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