不同半径掺气泡对空泡泡壁压力影响的数值研究  

Numerical study on effect of aeration bubbles with different radii on wall pressure of cavitation bubble

作　　者：郭志萍[1,2] 董志勇[2] 

机构地区：[1]山西水利职业技术学院,山西运城044004 [2]浙江工业大学水利与市政工程研究所,杭州310014

出　　处：《水力发电学报》2013年第2期129-132,183,共5页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金项目(50879078);浙江省重点科技创新团队计划(2010R50035)

摘　　要：通过考虑含有一定量蒸汽的空泡和掺入一个大气压空气的掺气泡之间的相互作用,在黏性可压缩液体中建立了空泡与掺气泡相互作用的耦合方程组模型,研究了不同掺气泡半径变化对空泡泡壁压力的影响,并进行了数值计算。计算结果表明:在同一个掺气泡初始半径下,空泡含气量越小,溃灭时泡壁最大压力越高。随着掺气泡初始半径的增大,空泡泡壁的最大压力先增大后减小,最大压力出现极值,此极值使空泡在压力升高区溃灭时能阻止空泡被过度压缩,减少了空蚀破坏能力,表明在空泡与掺气泡相互作用的掺气减蚀研究中掺气泡有最佳半径值。The behavior of cavitation bubble wall pressure under the influence of aeration bubble of different radii is studied to consider the effects of vapor and noncondensable gas inside a cavitation bubble and the effects of air inside an aeration bubble in this study.Dynamical models for interaction of these two bubbles in viscous compressible liquid are developed,and coupling equations are used for description of the effects of aeration bubble on the cavitation bubble.Calculations indicate that with a given initial radius of the aeration bubble,the maximum collapsing pressure on the wall of cavitation bubble increases when its air content is reduced.As the initial radius is increased,this maximum pressure temporally climbs up and then declines,resulting in a peak value.This means that if collapsing in a higher pressure region,the cavitation bubble would be prevented from excessive compression and its capacity of cavitation erosion be lowered.Therefore,in terms of bubble interaction behavior,the radius of aeration bubble has an optimum value,which is valuable to cavitation control by aeration.

关 键 词：水力学 掺气泡 空泡 相互作用 压力 

分 类 号：TV131.3[水利工程—水力学及河流动力学]