| Citation: | ZHANG Zehao, DONG Libao, ZHAO Liyou, et al. Numerical simulation of acoustic mode characteristics of combustion chamber considering influence of dome[J]. Journal of Aerospace Power, 2026, 41（4）：20250119 doi: 10.13224/j.cnki.jasp.20250119
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Numerical simulation of the acoustic mode characteristics of the combustion chamber with the dome was carried out based on the coupled computational aeroacoustic (CAA)/low-order thermoacoustic network method. The eigenfrequencies, damping rates and acoustic pressure distribution clouds of the main acoustic modes of the combustion chamber were obtained, the accuracy and efficiency of the coupling methods were verified, and the influence of the dome on the acoustic mode characteristics was compared and analyzed. The results showed that, after considering the influence of the dome which was coupled with the acoustic pressure distribution of the combustion chamber, the damping rate of the first-order transverse and longitudinal modes of the combustion chamber was reduced by 24.5% and 16%, but the effect on eigenfrequency was not obvious; compared with the CAA method, the coupling method can improve the calculation efficiency by 49% under the condition of ensuring the calculation accuracy, making it very suitable for the engineering of multi-nozzle liquid rocket engine combustion chamber.
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