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

由于液氧、液氢涡轮泵的小型化和大功率化，液氧、液氢涡轮泵的进气口不可避免地会出现空化现象。空化有时会产生空化不稳定，这是由于空化的非定常特性与泵系统的相互干扰而引起的泵的不良振荡。空化失稳导致泵的效率宣告或损坏。为了实现液体火箭的重复利用，本文试图发展空化不稳定性和空化侵蚀的数值计算方法，特别是在液氢和液氧等低温环境下。

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.