Numerical Analysis of Flame Flashback and Instability in Cavity-Stabilized Supersonic Combustion

XIAO Yexin; JIN Tai

doi:10.21656/1000-0887.440103

Volume 44 Issue 9

Sep. 2023

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XIAO Yexin, JIN Tai. Numerical Analysis of Flame Flashback and Instability in Cavity-Stabilized Supersonic Combustion[J]. Applied Mathematics and Mechanics, 2023, 44(9): 1042-1053. doi: 10.21656/1000-0887.440103

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Numerical Analysis of Flame Flashback and Instability in Cavity-Stabilized Supersonic Combustion

doi: 10.21656/1000-0887.440103

XIAO Yexin,
JIN Tai^,

School of Aeronautics and Astronautics, Zhejiang University, Hangzhou 310027, P.R.China

Received Date: 2023-04-12
Rev Recd Date: 2023-07-21
Publish Date: 2023-09-01

Abstract

Abstract

Aimed at the phenomenon of flame flashback and low-frequency combustion oscillation in the scramjet combustor with equal straight cross sections, 3D simulations were conducted, with the hybrid RANS/LES method (delayed detached-eddy simulation, DDES) for turbulence modeling and the partially stirred reactor (PaSR) for turbulence-reaction interactions. The obtained entire combustion oscillation period is consistent with the low-frequency combustion oscillation phenomenon observed in the experiment. The low-frequency combustion oscillation period can be divided into 3 stages: the cavity-holding flame, the flame flashback, and the flame blowout. By analysis of the reacting flow field in different stages of the low-frequency combustion oscillation cycle, the possible formation mechanism of low-frequency combustion oscillations was summarized. The results show that, there is no choking in the combustion chamber during the whole low-frequency combustion oscillation period. The pressure rise induced by shock interaction and the heat released by combustion are the key factors for the formation of low-frequency combustion oscillations in the combustion chamber.
- flame flashback,
- low-frequency combustion oscillation,
- combustion flow field,
- choking

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References(28)

References

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