| Citation: | SHI Pengyu, ZHANG Qibin, WANG Zhisheng, et al. Effect of injection structure on the self-pulsation characteristics of supercritical RP-3 aviation kerosene jet[J]. Journal of Aerospace Power, 2025, 40（3）：20230359 doi: 10.13224/j.cnki.jasp.20230359
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Self-pulsation in fuel injection is an important cause of combustion instability, and the "gas-like" nature of supercritical fuel makes its self-pulsation yield a more significant effect on oil-gas mixing and combustion. The self-pulsation of supercritical kerosene jets in the rotating flow field was investigated to find out the causes of the self-pulsation and the ways to suppress it. The supercritical kerosene injection processes under different companion flow conditions, recess ratios, and gas-liquid area ratios were investigated by using a high-speed schlieren technique using the proper orthogonal decomposition. The results showed that the oscillation modes of self-pulsation were represented by axial and radial oscillations, and the accompanying gas affected the self-pulsation region. When the gas-liquid area ratio was 674, the cause of self-pulsation was oil-associated gas interaction, and the self-pulsation decreased with the decrease of the recess ratio; when the gas-liquid area ratio was 416 and 178, the cause of self-pulsation was associated gas-environment interaction, and the self-pulsation increased with the decrease of the recess ratio.
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