喷射结构对超临界 RP-3 航空煤油射流自激振荡特性的影响

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.