液体火箭发动机诱导轮旋转汽蚀分析

Analysis of Rotating Cavitation in Inducers for Liquid Rocket Engine

关键词:  诱导轮  旋转汽蚀  数值仿真  质量流量增益系数

Key words:  Inducer  Rotating cavitation  Numerical simulation  Mass flow gain factor

摘要:

超同步旋转汽蚀和次同步旋转汽蚀是液体火箭发动机诱导轮旋转汽蚀现象的两种类型。为了揭示它们之间的差异,完成了Tsujimoto旋转汽蚀计算模型的理论求解,开展了旋转汽蚀现象的数值计算。结果表明,旋转汽蚀两种类型发生时,质量流量增益系数M都发生周期性变化。当超同步旋转汽蚀发生时,M>0；而当次同步旋转汽蚀发生时,M值的变化范围更广。由于在设计工况点附近,通常有M>0,因此在多数情况下很难观测到次同步旋转汽蚀。 

Abstract:

Super-synchronous and sub-synchronous rotating cavitation are two types of rotating cavitation in liquid rocket engine inducer. To investigate the difference between these two phenomena, the solution analysis was conducted based on the Tsujimoto rotating cavitation model, and numerical simulation was carried out. The results show that, when both types of the rotating cavitation take place, the mass flow gain factor M changes periodicaly. For the super-synchronous, M is larger than 0. However, for the sub-synchronous rotating cavitation, range of variation M is more extensive. Hence, in the most cases, the sub-synchronous rotating cavitation was hardly observed.