热力学效应对低温诱导轮旋转汽蚀影响的数值研究

Influence of thermodynamics effect on inducer rotating cavitation under low temperature condition

诱导轮是液体火箭发动机中提高涡轮泵性能的关键部件,而旋转汽蚀是引起诱导轮故障的原因之一。低温液体发生汽蚀时会产生大量的潜热,对汽蚀流动产生重要的影响。利用基于Rayleigh-Plesset方程的混合流体模型,并考虑了汽蚀热力学效应,对诱导轮二维叶栅中的低温旋转汽蚀现象进行了数值分析。计算结果表明,考虑热力学效应时,产生旋转汽蚀的入口压力值下降;低温条件下的温度变化对超同步旋转汽蚀没有影响,而对次同步旋转汽蚀影响显著。

Inducer is a key component of liquid rocket propulsion system to improve the performance of turbopump. It is well-known that rotating cavitation is harmful to turbopump, and even causes the launch failure of a rocket. Cavitation in cryogenic fluids can produce much latent heat, and has a thermodynamic effect because of thermal imbalance around the cavity. A numerical analysis of cryogenic fluids rotating cavitation in 2D blade cascade in inducer is performed with a mixture model based on Rayleigh-Plesset equation with the thermodynamic effect considered. The results indicate that the inlet pressure will decrease when take into account the thermodynamic effect. Changes in the temperature of liquid hydrogen effect on the super-synchronous rotating cavitation are not obvious,but on the sub-synchronous rotating cavitation are significant