低温诱导轮空化特性数值计算研究

In order to investigate the cavitation performance of inducer with cryogenic fluids, the cavitating flows inside an inducer with liquid nitrogen was simulated. In the numerical method, a FBM turbulence model with the rotational correction and Singhal cavitation model with the thermal correction were applied. The numerical method was verified by the general agreement between the numerical results and experimental data. The results show that, with the decreasing cavity number, three typical cavitation pattern in inducer can be observed, namely no-cavitation, gap cavitation, and back-flow vortex cavitation. The critical point for different cavitation stages will not change with the temperature changing(77.5 K≤T≤83 K). The cavity volume inside inducer increased at first and then decreased with the increasing temperature of liquid nitrogen. This is because the Weber number dominates the development of cavitation at low temperature while thermal effects aren't remarkable. As temperature increases, thermal effects dominates the cavitation dynamics, which suppresses the development of cavitation, while the thermal effects becomes more and more significant when the temperature is higher and the cavitation is highly suppressed.