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Many technical combustion devices are susceptible to thermoacoustic instabilities. A deeper understanding of this transient phenomenon as well as the underlying physical processes is desirable. In this context, a turbulent enclosed flame is investigated numerically within this work by means of a hybrid LES/CAA (Large Eddy Simulation/Computational Aero Acoustics) approach as a step towards a numerical prediction of combustion instability. A thermoacoustically stable as well as a thermoacoustically unstable operating point are investigated. The LES computations reveal good overall agreement between simulation and experimental data. However, the recirculation zone, which is created by a backward facing step, is underestimated for the unstable case. The amplitudes as well as the frequencies of the simulated acoustic pressure are in good agreement with experimental data for the stable case. Considering the unstable case, the frequency of the oscillation is captured accurately, while the amplitudes are underpredicted.

Numerical Analysis of Thermoacoustic Instabilities Using LES and Computational Aeroacoustics