两空泡运动特性研究

本文应用边界方法研究了两个相邻空泡的运动特性，得到了空泡的演化规律，以及空泡溃灭时的射流速度与溃灭时间的变化趋势，对于两个空泡之间的距离和半径比的影响进行了讨论。计算结果表明：不同大小的空泡在一起时则小泡会先溃灭，且人泡的存在时间与两泡的半径比成正比；大泡对小泡来说其作用相当于－固壁面，小泡会形成－指向大泡的溃灭射流。相同大小的空泡在一起溃灭时，会同时形成指向中间的射 流，与单空泡在固壁面附近的溃

The Speciality of Two Bubbles Interaction

Boundary element method is used to calculate the evolution of two neighboring cavity bubbles. The effects of the distance between bubble center and the ratio of bubble radii on cavity evolution, jet velocity and collapse time are discussed. The numerical results show that for the case of bubbles with different sizes, the small bubble will collapse first, a micro jet will form and direct to the bigger one due to its action, which is equivalent to that of a solid wall. The existing period of the small bubble is proportional to the ratio of bubble radii. The collapse of two bubbles being of same sizes corresponds to that of a bubble collapsing near a solid wall, two micro jets develop simultaneously and direct to the middle of bubbles. The results may be useful to the study of bubble clouds.