| Citation: | MENG Jingyuan, LI Bin, WANG Guangxu, et al. Analysis and optimization of acoustic damping characteristics of staged combustion cycle engine thrust chamber[J]. Journal of Aerospace Power, 2024, 39（12）：20230010 doi: 10.13224/j.cnki.jasp.20230010
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In view of the development requirements of the staged combustion cycle liquid rocket engine, a research and optimization analysis of the acoustic damping characteristics of the mixed head in the thrust chamber was carried out. A three-dimensional linear acoustic damping characteristic model considering the acoustic impedance of the flow distributor and the damping source term was established to quantify the damping dissipation of the mixed head. The acoustic mode frequency and growth rate of the thrust chamber were obtained by solving the Helmholtz equation, and the damping components such as the flow distributor and the injector were optimized. The results showed that the impedance of the flow distributor and the advective mean flow energy of the injector had a damping effect, and the average mean effect was more significant. The size and spacing of the hole within the flow distributor, the height of the oxidizer plenum and the length of the injector constituted the key parameters to improve the damping effect of the mixed head.
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