单泡空化振动系统的动力学数值模拟

根据微气泡的动力学方程，用数值计算的方法，采用改进的初始半径对单泡超声空化现象进行了研究。分析表明：气泡的振动对初始半径这个参量很敏感；气泡崩溃速率随气泡初始半径的增加而增大，在一定范围内能保证空化泡稳定的振动，在初始半径为1.6μm处空化程度最强，如果继续增大初始半径则空化程度减弱甚至消失、同时，将分析结果与前人的实验数据比较，发现在考虑液体的可压缩性以后对单泡最佳空化区域有很大的改进。

Numerical simulations of dynamics in the vibration of single cavitation bubble

According to the dynamical equation of the micro-bubble, the ultrasonic cavitation phenomenon of single bubble was numerically analyzed by an adjusted initial radius. The analysis indicated that the bubble vibration was very sensitive to some parameters. With the increase of bubbles＇ initial radius, the collapse velocity of the bubble becomes higher, the vibration of cavitation bubble could keep on a steady process in a range of initial bubble radius. The strongest cavitation was estimated at the initial radius of 1.6μm, and would weaken or vanish when kept the initial bubble radius increasing. Moreover, by comparing the calculated results with the published experimental data, it was found that the boundaries of the best cavitation could be improved greatly by considering the effect of compressible liquid model.