近壁区尺寸相近双空泡溃灭动态特性数值分析  

Numerical analysis of collapsing characters of two approximately equal-size bubbles near wall

作　　者：田中杰 耿琳琳[1,2,3] 张成华 张德胜 TIAN Zhongjie;GENG Lingling;ZHANG Chenghua;ZHANG Desheng(Research Center of Fluid Machinery Engineering and Technology,Jiangsu University,Zhenjiang 212013,Jiangsu China;Wenling Fluid Machinery Technology Institute of Jiangsu University,Wenling 317525,Zhejiang China;Asia-Pacific Pump&Valve Co.Ltd.,Taizhou 225403,Jiangsu China)

机构地区：[1]江苏大学流体机械工程技术研究中心,江苏镇江212013 [2]江苏大学流体机械温岭研究院,浙江温岭317525 [3]亚太泵阀有限公司,江苏泰州225403

出　　处：《华中科技大学学报(自然科学版)》2024年第12期85-93,共9页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金青年基金资助项目(52409115);江苏省自然科学基金青年项目(BK20220538);江苏省研究生科研与实践创新计划资助项目(SJCX24_2434)。

摘　　要：基于可压缩流体体积(VOF)方法数值模拟了近壁区两个大小相近空泡上下排列时的动力学特性,通过网格、计算域无关性研究及对比单空泡实验结果验证了数值计算结果的准确性.通过对比分析不同近壁距离下单空泡与双空泡的动力学特征及瞬时形态,发现在双空泡配置下,由于空泡彼此相互影响致使两个空泡的瞬时形态及溃灭时间均发生明显改变,近壁空泡溃灭前的微射流最大速度及溃灭压力明显增大,且增幅随着泡间距离的增大而逐渐缩小;此外,上下两空泡的生命周期均被不同程度延长,且当近壁空泡的无量纲距离≥2时,在同样的泡间距离下,上空泡对近壁空泡生命周期的影响规律趋于一致.The compressible volume of fluid(VOF)method was employed to numerically study the dynamics of two bubbles in a column at fixed distances from each other.The accuracy of the current numerical calculation was verified through the mesh and computational domain independence study and also validated by comparing with single bubble experimental results.Through comparing and analyzing the dynamic characteristics and instantaneous morphology of single and two bubbles at different near-wall distances,it is found that the instantaneous morphology and collapse time of bubble are both changed due to bubbles′interaction.The maximum velocity and driving pressure of the microjet when the near-wall bubble is about to the collapse increase significantly,and the increasement extent decreases with the increasing of the bubbles′distance.In addition,the lifespans of the upper and lower bubbles are both delayed,and the influence of the upper bubble on the lifespan of the near-wall bubble tends to be consistent when the stand-off distance of the near-wall bubble is≥2.

关 键 词：双空泡 尺寸相近 微射流 空泡溃灭动力 空泡生命周期 

分 类 号：TK730[交通运输工程—轮机工程]