多边界条件下空化气泡演变特性的试验研究  

Experimental study on evolution characteristics of cavitation bubble under multiple boundary conditions

作　　者：胡建明 王字满 李志爽 HU Jianming;WANG Ziman;LI Zhishuang(School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学机械与车辆学院,北京100081

出　　处：《排灌机械工程学报》2023年第4期393-399,416,共8页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51806012);北京市自然科学基金项目(3192032)。

摘　　要：为了揭示空泡在复杂边界条件作用下的动态演变机制,以电容器在水中放电产生的气泡为研究对象,通过对气泡的溃灭时间、迁移距离和水柱高度等动态特性参数进行定量分析,得到了边界效应对气泡发展的影响规律.结果表明,气泡在射流阶段、射流击穿气泡和回弹3个阶段气泡形态变化剧烈;多边界条件下,竖直刚性边界影响气泡内部射流的偏转角度;水平刚性边界影响气泡膨胀和溃灭过程的发展形态,气泡与水平刚性边界的距离大于、小于气泡半径时,产生2种不同的回弹形态;距自由液面越远,气泡内部射流越宽,自由液面对液面上方水柱高度的影响大于刚性边界.通过气泡和多边界相互作用的研究揭示在复杂环境下空泡动态演化机制,可为复杂环境下气泡动态特性的预测分析提供相应支撑.In order to reveal the dynamic evolution mechanism of a cavitation bubble under the in-fluence of complex boundary conditions,the bubble generated by the capacitor discharge in water was taken as the research object.Through the quantitative analysis of the bubble collapse time,migration distance and water column height and other dynamic characteristic parameters,the influence of the boundary effect on the bubble development was obtained.The results show that the bubble morphology changes drastically in the jet stage,jet breakdown bubble and rebound stage.The vertical rigid boun-dary affects the jet deflection angle inside the bubble under multiple boundary conditions.The horizontal rigid boundary affects the bubble expansion and collapse process,when the distance between the bubble and the horizontal rigid boundary is greater than and smaller than the bubble radius,two diffe-rent rebound forms are produced.The farther from the free liquid surface,the wider the jet inside the bubble.The influence of the free surface on the height of the water column above the free surface is greater than the rigid boundary.The research on the interaction between the bubble and multiple boundaries is conducive to revealing the dynamic evolution mechanism of the bubble in complex environments,and aims to provide support for the prediction and analysis of bubble dynamic characteristics in complex environments.

关 键 词：空化气泡 刚性壁面 自由液面 边界效应 射流 

分 类 号：S277.9[农业科学—农业水土工程] TK40[农业科学—农业工程]