流体物性对空化气泡溃灭过程影响研究  

Effect of liquid physical properties on collapse process of cavitation bubbles

作　　者：朱坤[1] 沃恒洲[1] 徐玉福[1] 胡献国[1] 

机构地区：[1]合肥工业大学机械与汽车工程学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2011年第9期1295-1297,1312,共4页Journal of Hefei University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(50875071);安徽省自然科学基金资助项目(11040606M06)

摘　　要：文章采用VOF模型,模拟近壁面气泡在流场中的溃灭过程,研究了流体的不同物性(黏性和表面张力)对气泡溃灭过程的影响。结果表明:在近壁面,空泡将形成非对称溃灭;因水锤作用,引发高速射流在壁面产生高压而形成空蚀破坏;流体的黏度越大,气泡的溃灭周期越大,射流压强越小;空泡溃灭的周期随液体表面张力的增大而减小,射流压强随表面张力的增大而增大。Volume of fluid（VOF） model is used to simulate the bubble collapse process near the solid wall.The behaviour of bubble collapse process in case of the fluids with different viscosity and surface tension is investigated.The results show that the asymmetric bubble collapse is found near the solid wall.The following micro jet may cause high pressure domain on the solid wall to induce the cavitation erosion based on the water hammer theory.The bubble collapse time increases with the fluid viscosity,while the liquid jet pressure decreases with the increase of the fluid viscosity.The surface tension forces speed up the bubble collapse,and the higher surface tension increases the liquid jet pressure.

关 键 词：气泡 溃灭 黏性 表面张力 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]