基于伪势模型的表面张力对空化泡溃灭的影响  

Surface Tension Effects on Cavitation Bubble Collapse with Lattice Boltzmann Pseudo-potential Model

作　　者：邹建锋 何小泷 袁浩 汪凯迪 周昔东 ZOU Jian-feng;HE Xiao-long;YUAN Hao;WANG Kai-di;ZHOU Xi-dong(Guiyang Engineering Cooperation Limited,Guiyang 550081,China;Chongqing Southwest Research Institute for Water Transport Engineering,Chongqing Jiaotong University,Chongqing 400074,China;China Three Gorges Construction Engineering Corporation,Chengdu 610000,China;College of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]中国电建集团贵阳勘测设计研究院有限公司,贵阳550081 [2]重庆交通大学重庆西南水运工程科学研究所,重庆400074 [3]中国三峡建工(集团)有限公司,成都610000 [4]重庆交通大学河海学院,重庆400074

出　　处：《长江科学院院报》2022年第9期71-76,83,共7页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金项目(52109088)。

摘　　要：采用可调节表面张力的大密度比、大黏滞系数比格子玻尔兹曼伪势空化模型模拟了近壁区空化泡溃灭过程,并进一步分析了表面张力和初始空化泡内外压差对空化泡溃灭过程中流场分布的影响,探究了表面张力变化对空化泡溃灭时产生的微射流和溃灭压力演化的影响。结果表明:在近壁区空化泡溃灭过程中,随着表面张力减小,加剧了气液交界面的变形,导致微射流更为集中。同时空化泡在溃灭过程中蓄积的表面能减小,在溃灭时刻迅速释放后,减弱了空化泡溃灭强度,空化泡溃灭最大微射流流速和最大压力均随着表面张力的减小而减小,导致空化泡溃灭时间缩短,增加了壁面引起的Bjerknes力,加剧空化泡朝向壁面溃灭的趋势。The process of near-wall cavitation bubble collapse was simulated by using Lattice Boltzmann pseudo-potential cavitation model with tunable surface tension and large density and viscosity coefficient ratio.Furthermore,the influence of surface tension and the initial pressure difference between inside and outside the bubble on the flow field distribution was analyzed,and the relationship between surface tension and maximum micro-jet and collapse pressure was investigated.The results indicate that,with the decrease of surface tension,the range of high-pressure region above the cavitation bubble increases,while the range of low-pressure region between bubble and wall decreases in the final collapse stage.The smaller surface tension intensifies the deformation of the gas-liquid interface,resulting in a more concentrated micro-jet.In addition,more surface energy accumulated during cavitation bubble collapse strengthens the collapse intensity,leading to the increase of the maximum micro-jet velocity and collapse pressure.However,with the increase of pressure difference between inside and outside the cavitation bubble,the effect of surface tension is reduced.Besides,the smaller surface tension leads to the shorter lifetime of cavitation bubble,which increases the Bjerknes force and aggravates the trend of cavitation bubbles collapse towards the wall.

关 键 词：空化泡溃灭 表面张力 溃灭压力 格子玻尔兹曼方法 微射流 

分 类 号：TV13[水利工程—水力学及河流动力学]