Effort to reuse of the liquid rocket turbopump -Numerical analysis of cryogenic cavitation-

液体火箭发动机涡轮泵的尺寸被缩小到最大限度，并使其成为大马力，因此在涡轮泵入口处不可避免地会发生气穴现象。汽蚀有时会产生汽蚀不稳定性，汽蚀不稳定性是汽蚀的非定常特性与泵系统相互干扰而引起的泵的不希望有的振荡。汽蚀不稳定性导致泵的效率下降或损坏。本文以液体火箭为研究对象，针对液氢、液氧等低温环境下的空泡不稳定性和空蚀问题，开展了数值模拟方法的研究。

Cavitation occurs inescapably in inlet of turbopump of liquid rocket engine, because the liquid oxygen and hydrogen turbopumps are downsized and made as high-horsepower to the utmost limit. The cavitation sometimes yields cavitation instability, which is undesirable oscillation of the pump induced by mutual interference between the unsteady characteristics of cavitation and the pump system. The cavitation instability induces the declaration of efficiency or damage in the pump. In the present study, in an effort to reuse of the liquid rocket, the numerical method for the cavitation instability and cavitation erosion is attempted to be develop especially in a cryogenic environment such as liquid hydrogen and oxygen.