| TONG Zhao-xu, HAN Qi-xiang.Numerical Simulation of Combustion Instability Behind Bluff Body Flame Holder[J].航空发动机,2023,49(1):81-88 |
| Numerical Simulation of Combustion Instability Behind Bluff Body Flame Holder |
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| Key Words:afterburner bluff body flame holder combustion instability numerical simulation aeroengine |
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| Abstract:In order to alleviate the frequent combustion instability problems in aeroengine afterburners，the 3D thermal numerical sim?
ulation based on large eddy simulation（LES）for a model afterburner with bluff body flame stabilizer was carried out by using commercial
software Fluent. Three key factors about the temperature of the incoming gas，the Mach number of the incoming gas and the fuel equivalent
ratio were analyzed for their influence on combustion instability after the flame holder. The results show that when the inlet temperature ris?
es from 600 K to 1200 K，the flame form behind the flame stabilizer changes from straight shear layer flame to wavy vortex flame，and the
combustion instability mechanism changes from K-H instability to BVK instability. When the incoming Mach number increases from 0.1 to
0.3，the frequency of combustion instability increases，and the amplitude of pressure pulsation also increases，but the amplitude of exother?
mic pulsation increases first and then decreases. When the fuel equivalent ratio increases from 0.5 to 0.7，the frequency of combustion insta?
bility changes slightly，and the amplitude of pressure pulsation and exothermic pulsation tends to increase first and then decrease. |
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