长江科学院院报 ›› 2022, Vol. 39 ›› Issue (9): 71-76.DOI: 10.11988/ckyyb.20210450

• 水力学 • 上一篇    下一篇

基于伪势模型的表面张力对空化泡溃灭的影响

邹建锋1, 何小泷2, 袁浩2, 汪凯迪3, 周昔东4   

  1. 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
  • 收稿日期:2021-05-07 修回日期:2021-10-25 出版日期:2022-09-01 发布日期:2022-09-21
  • 通讯作者: 何小泷(1990-),男,重庆江津人,助理研究员,博士,主要从事水工水力学方面的研究。E-mail:Hexiaolong1990@cqjtu.edu.cn
  • 作者简介:邹建锋(1989-),男,福建龙岩人,工程师,硕士,主要从事水利水电施工组织设计工作。E-mail:zjf_scu@126.com
  • 基金资助:
    国家自然科学基金项目(52109088)

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

ZOU Jian-feng1, HE Xiao-long2, YUAN Hao2, WANG Kai-di3, ZHOU Xi-dong4   

  1. 1. Guiyang Engineering Cooperation Limited,Guiyang 550081,China;
    2. Chongqing Southwest Research Institute for Water Transport Engineering,Chongqing Jiaotong University,Chongqing 400074,China;
    3. China Three Gorges Construction Engineering Corporation,Chengdu 610000,China;
    4. College of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China
  • Received:2021-05-07 Revised:2021-10-25 Online:2022-09-01 Published:2022-09-21

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。

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

Abstract: 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.

Key words: cavitation bubble collapse, surface tension, collapse pressure, lattice Boltzmann method, micro-jet

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