Recent advancements of gas turbine combustion systems gave rise to increasingly frequent occurrence of thermoacoustic instabilities at high frequencies, which hamper engine operation and often require costly mitigation strategies. This work experimentally investigates the physical mechanisms behind these instabilities in gas turbines with sequential combustion. For this purpose, the non-compact feedback between acoustic pulsations and the unsteady heat release is analyzed for a swirl and a reheat combustor experiment.
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Recent advancements of gas turbine combustion systems gave rise to increasingly frequent occurrence of thermoacoustic instabilities at high frequencies, which hamper engine operation and often require costly mitigation strategies. This work experimentally investigates the physical mechanisms behind these instabilities in gas turbines with sequential combustion. For this purpose, the non-compact feedback between acoustic pulsations and the unsteady heat release is analyzed for a swirl and a rehea...
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