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Session: Reacting and compressible flows 1
Session starts: Wednesday 26 August, 13:30
Presentation starts: 13:45
Room: Room F

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Tomoaki Kitano (Kyoto University)
Ryoichi Kurose (Kyoto University)
Satoru Komori (Kyoto University)

Abstract:
A large-eddy simulation of combustion instability in a back-step flow is performed, and the effect of equivalent ratio on the combustion instability is investigated. Methane is used as the fuel and a two-step global reaction model is used for the reaction. As the turbulent combustion model, a dynamic thickened flame model is used. The results show that flame is stably formed behind the step by the recirculation flow. Large pressure oscillation and periodical change of flame shape are observed in the case of equivalent ratio of 1.0, and the power spectra of the pressure oscillation has peaks whose frequencies and ntensities well agree with those of the previous experimental study. The intensity of the pressure oscillation becomes much smaller in the cases of equivalent ratio of 0.8 and 1.3, and the change of flame shape also becomes smaller.