圆锥边界附近激光空泡溃灭行为的研究

摘要

为了研究刚性圆锥边界锥角对激光空泡溃灭行为的影响，文章建立了虚拟平面边界模型，同时采用阴影摄影术、光偏转法以及数值计算的手段对边界附近空泡溃灭过程进行了研究．结果表明边界的锥角对空泡的形状、溃灭时间以及液体射流形成均有明显影响．空泡形状偏离球形的程度和溃灭时间均随锥角的增大而增大，且增大锥角度可以促使射流的形成．空泡溃灭时问的实验值同理论值具有较高的一致性，验证了虚拟平面边界假设及无量纲距离修正的有效性．%The effect of the cone boundary on collapse of the laser-induced bubble is investigated under the assumption of virtual plane, and the methods of shadow photography, optical beam deflection and simulation are also used to obtain the effect of cone angle on the bubble dynamics. The results indicate that the effects of the cone angle on the shape of bubble, collapse time and the formation of liquid jet are obvious. The degree of departure of bubble shape from spherical shape and the collapse time are found to increase with the increase of cone angle, and the valid liquid jet is able to form at a lager cone angle. The experimental value and theoretical value of collapse are in good agreement with each other, and the assumption of virtual plane and the modification of dimensionless distance parameter proposed in this study are valid.