强电场下气泡形变对液体绝缘的影响  

Impact of air bubble deformation on dielectric liquid subjected to strong electric field

作　　者：蔡丹[1] 刘列[1] 

机构地区：[1]国防科学技术大学光电科学与工程学院,长沙410073

出　　处：《强激光与粒子束》2011年第11期2966-2970,共5页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(10975186)

摘　　要：基于液体气泡击穿的椭球模型,推导了气泡形变的流体动力学方程;利用软件Comsol模拟了气泡受力后的形变;根据模拟结果,结合气体击穿的帕邢定律,讨论了气泡形变对液体绝缘的影响。结果表明:气泡在静电引力和表面张力的作用下,沿电场线方向拉伸成椭球,椭球长短轴之比与外加电场强度和气泡初始半径成正比;形变导致电场方向气体通道延长,气泡更容易击穿,外加气压是避免气泡击穿的有效途径之一,外加气压的大小与电场强度和气泡初始半径成正比。The electrohydrodynamic equation of bubble deformation in liquid was derived based on the ellipsoid model of bubble breakdown in liquid.With the software Comsol being used to track the bubble deformation,the impact of air bubble deformation in dielectric liquid under strong electric field was discussed.The results show that the spherical bubbles turn into elliptical ones with the combined action of electric stress and surface tension.In order to avoid bubble breakdown,applying pressure is a practical measure.Moreover,the applied pressure and the bubble aspect ratio are in direct proportion to electric field strength and original bubble radius.

关 键 词：流体电动力学 气泡形变 电场 外加气压 初始半径 液体绝缘 

分 类 号：TM855[电气工程—高电压与绝缘技术]