群空泡的动力学分析

本文分析了空泡群在二维可压缩流场中溃灭过程及其作用于固壁上的压强,分析了群泡溃灭诱生压强的统计特性,指出由于空泡群中各空泡接受液体压力波的时间不同,先行溃灭的空泡加大了液体的压强,从而使后续空泡在更高的压强驱动下溃灭,因而进一步激发更大的液体压强。

On the Dynamics of Bubble Clusters

The method presented in reference6]is adopted to analyse the radial pressure generated by the collapse of bubble clusters in a cavitating flow passing a two-dimensional body. Statistical property of bubble-cluster-generated impluses is studied. By taking the calculated pressure as driving pressure of the bubbles in the vicinity of a solid wall, non-spherical collapses of the near-wall bubbles are investigated, the corresponding impact pressure are computed with the first order approximation of the liquid compressibility. Numercial results show that owing to the collective collapse of a bubble cluster, the driving pressure of the near-wall bubbles is enhanced consideradly, so that greater impact pressure will be generated and hence the erosion of the solid wall may be induced.