固壁面附近空化泡溃灭过程的数值模拟

Collapse simulation of a cavitation bubble near a rigid boundary

通过数值模拟研究空化泡与固壁的距离(γ)、空化泡大小和环境围压对单个空化泡溃灭的影响.结果表明:随着空化泡与壁面的间距减小,空化泡的非对称变形越来越明显,从形成射流到最终溃灭的时间不断增加,最大射流速度和溃灭压力都随之减小;空化泡大小对射流速度的影响不大,尽管溃灭压力随着空泡半径的增大而相应增大,但变化幅度很小;当环境围压增大,最大射流速度和溃灭压力都大幅度增大,溃灭压力在γ=2.0时的增幅甚至接近一个数量级.

The effect of the distance between cavitation bubble and the rigid wall（γ）,the size of cavitation bubble and ambient pressure on the collapse process of a single cavitation bubble near a rigid wall was numerically investigated.The results show that associated with the decrease ofγthe asymmetric deformation of cavitation bubbles becomes more obvious,the time from jet formation to final collapse increases,and both maximum jet velocity and collapse pressure decrease.The size of cavitation bubble has insignificant effect on jet velocity and collapse pressure.The maximum jet velocity and collapse pressure increase significantly with the increase ambient pressure,and the increase of collapse pressure is even close to an order whileγ=2.0.