Abstract
Thermoacoustics in modern gas turbines is always accompanied by lean premixed combustion. The flame transfer function (FTF) is an important quantity that can quantify thermoacoustics. However, the FTF is always considered as a black box and used in the final development phase. This work applied proper orthogonal decomposition (POD), which is normally used in hydraulic instability analysis. Results obtained by comparing the frequency response and mode shape indicated the flame was stable even in the presence of coherent structures in the flow field. The transfer function between the first three modes and overall heat release rate (HRR) was calculated to confirm the relationship between mode and the FTF. Results indicated that the potential risk of pulsation did not originate from flow instability.
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