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空化发生时,热力学效应使得流场内温度发生变化,从而通过气泡界面与液体的传热控制气泡的生长。本文考虑了这一空化热力学的影响,对已有的热力学空化模型进行了改进;采用改进的空化模型对NACA0015翼型及一种超小型泵在25℃和100℃下的空化流场进行了模拟。通过与实验值对比,验证了模型的有效性。研究表明在高温环境下空化的热力学效应显著,其影响不可忽略;在高温时空化的热力学效应抑制了超小型泵空化,从而改善了泵的空化性能。
When cavitation occurs, the thermodynamic effect causes the temperature in the flow field to change, thereby controlling the bubble growth through the heat transfer between the bubble interface and the liquid. In this paper, the effect of cavitation thermodynamics is considered, and the existing thermodynamic cavitation model is improved. The cavitation flow field at 25 ℃ and 100 ℃ of NACA0015 airfoil and an ultra-miniature pump are improved by the improved cavitation model. A simulation was conducted. By comparing with the experimental data, the validity of the model is verified. The results show that the thermodynamic effect of cavitation in high temperature environment is significant, and its influence can not be neglected. The thermodynamic effect of cavitation inhibits the cavitation of the ultra-compact pump and improves the cavitation performance of the pump.