双液滴撞击液膜的界面追踪法数值模拟  

FTM numerical simulation of double droplets impacting on liquid film

作　　者：胡中全 李竞伦 徐猛 马自强 李培生[1] HU Zhongquan;LI Jinglun;XU Meng;MA Ziqiang;LI Peisheng(School of Advanced Manufacturing,Nanchang University,Nanchang 330031,China;School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]南昌大学先进制造学院,江西南昌330031 [2]西安交通大学能源与动力工程学院,陕西西安710049

出　　处：《南昌大学学报（工科版）》2022年第2期168-175,共8页Journal of Nanchang University(Engineering & Technology)

基　　金：国家自然科学基金资助项目(52166009)。

摘　　要：使用界面追踪法(FTM)模拟了双液滴-液膜撞击系统中液膜卷吸气体生成气泡以及中心射流破碎发展成二次液滴的过程,分析了气泡生成以及射流破碎的机制。研究了不同We数与无量纲液滴间距的影响,得出双液滴撞击液膜系统中能发生气泡卷吸的We数范围是30~276,并且随着We数和无量纲液滴间距的增大,卷吸气泡的成型时刻越早,其体积也越大。对于中心射流的破碎,研究发现,We数越大,中心射流就会越早发生破碎,无量纲液滴间距越大,中心射流发生破碎时的We数阈值就越小,并且形成的二次液滴与碰撞轴线的距离越远,但是体积会越小。The processes of bubble generation by the liquid film entrained gas and the central jet fragmentation developing into secondary droplets in the double droplets-liquid film impingement system were simulated by front-tracking method(FTM),and the mechanism of bubble generation as well as jet fragmentation was analyzed.The effect of We number and dimensionless droplet spacing was also investigated,it was concluded that the range of We number that can occur bubble entrainment in the double droplets-liquid film impingement system was 30-276,and with the increase of We number and dimensionless droplet spacing,the earlier the formation time of the entrainment bubble,the larger its volume.For the fragmentation of the central jet,it was found that the larger the We number,the earlier the fragmentation of the central jet would happen.The larger the dimensionless droplet spacing,the smaller the We number threshold at which the central jet broken up,and the further the secondary droplet formed was from the impingement axis,but the smaller the volume would be.

关 键 词：界面追踪法 液滴碰撞 中心射流 气泡卷吸 二次液滴 

分 类 号：TK125[动力工程及工程热物理—工程热物理]