The focus of this dissertation is on screech type, high-frequency thermoacoustic instabilities in gas turbine combustors. In this frequency regime, thermoacoustic interactions between flame and acoustic modes are spatially variable, i.e. non-compact. Different modeling methodologies for the analysis of high-frequency thermoacoustics in gas turbine combustors are developed. The thermoacoustic behavior of a lab-scale, swirl-stabilized combustor is modeled and analyzed for validation of the methodologies and to gain understanding of physical mechanisms.
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The focus of this dissertation is on screech type, high-frequency thermoacoustic instabilities in gas turbine combustors. In this frequency regime, thermoacoustic interactions between flame and acoustic modes are spatially variable, i.e. non-compact. Different modeling methodologies for the analysis of high-frequency thermoacoustics in gas turbine combustors are developed. The thermoacoustic behavior of a lab-scale, swirl-stabilized combustor is modeled and analyzed for validation of the methodol...
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