Schalldämpfung zur Unterdrückung thermoakustischer Instabilitäten unter Brennkammerbedingungen

Abstract

The replacement of the Helmholtz resonators currently used for damping thermoacoustic instabilities in stationary gas turbines by ceramic pore absorbers could improve both the efficiency of combustion and the operating range of the gas turbines. In this thesis, the effect of ceramic pore absorbers on thermoacoustic instabilities in a combustion chamber was experimentally investigated. Their sound absorption properties were calculated simulatively under combustion chamber conditions as well as determined experimentally under normal conditions and at ambient pressure increased to 5 bar. The comparison of the results was used to validate the simulation. Finally, the simulation was used to determine acoustic target parameters under specific operating conditions.