贮箱及输送管路流场空化发展机理研究

Mechanism research of cavitation process in rocket tank and conveying pipe

基于Pumplinx仿真分析软件开展了非稳态两相流仿真模拟分析,针对贮箱及下游输送管路,研究空化现象发展机理,并给出了试验验证。结果表明,贮箱出口边界流量增大后输送管内各截面会依次发生空化,截面压力降低至饱和蒸气压。空化现象根据空化程度不同,可以分为局部微量空化和深度空化两种状态,不同状态下空化发展过程不同。在微量空化状态下,空化区域存在于出流口局部,不会向下游发展;在深度空化状态下,空化区域不断发展,贮箱出流口会发生限流,空化夹气逐步发展至出口,从而不满足发动机入口要求。

Based on the Pumplinx software,the unsteady two-phase flow simulation analysis was carried out.Aiming at the tank and the downstream conveying pipe,the influence mechanism of cavitaion phenomenon on the tank outflow was studied,and the experimental verification results were given.The results show that the tank outlet can be considered as a vent-like structure which has the maximum cavitation choke flow rate.According to the cavitation degree,cavitation can be divided into slightly cavitation status and deep cavitation status.When deep cavitation occurs in the conveying tube,the outlet of the storage tank is limited,and cavitation will develop to the pipe outlet and the requirements of the rocket inlet will not meet.Based on different cavitation states,this paper gives a criterion for suppressing cavitation,that is,judge the degree of cavitation by comparing the cavitation choke flow with the actual flow rate,and then judge whether the design of tank and conveying pipe meets the requirements of cavitation.