双液滴连续倾斜撞击液膜界面演变特性的研究  

Numerical Study on Interface Evolution Characteristics of Successive and Oblique Dual Droplets Impacting Liquid Film

作　　者：鲍民乐 郭亚丽[1] 龚路远[1] 沈胜强[1] BAO Minle;GUO Yali;GONG Luyuan;SHEN Shengqiang(Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education,Dalian University of Technology,Dalian,116023,China)

机构地区：[1]大连理工大学能源与动力学院,大连116023

出　　处：《工程热物理学报》2023年第10期2834-2841,共8页Journal of Engineering Thermophysics

基　　金：国家自然科学基金重点项目(No.51936002);中央高校基本科研业务费资助(No.DUT21LAB128)。

摘　　要：本文采用CLSVOF方法对双液滴连续倾斜撞击薄液膜的过程进行了三维数值模拟,分析了撞击过程中界面演变的多种特征,包括一次水花和二次水花的形成、碰撞、融合和伸展,弹坑的形成、扩展和局部失稳。结果表明,界面演变过程中,气体空腔,液嵴和气谷等一些特殊形态特征会出现。此外,文中总结了弹坑在研究时间范围内的轮廓演变特征,定量分析了上游、下游和侧向三个方向上弹坑半径最大值随时间的变化,发现了液体动能在周向方向的分布规律。此研究对于喷雾冷却、冶金冶炼和航空航天等工业生产应用与升级有重要意义。In this paper,the three-dimensional numerical model has been constructed to simulate the process of the dual droplets impacting the liquid film successively and obliquely,and the CLSVOF method is applied to trace the two-phase interface.The interface evolution characteristics during the impacting process are analyzed,including the formation,collision,coalescence,and extension of the primary and secondary crowns,and the emergence,inflation,and local instability of the crater.Result shows that some special morphological features appear during the interface evolution,such as the gas cavity,liquid crest,and air gap.Besides,the evolution characteristics of the crater profile are summarized within the specified time range of this study.The variation of the maximum crater radiuses with time in upstream,downstream,and lateral directions is analyzed.The distribution feature of liquid kinetic energy in the circumferential direction is elucidated.This study is of great significance to spray cooling,metallurgy,aerospace,and other industrial applications.

关 键 词：液滴撞击 双液滴 倾斜撞击 液膜 两相界面 

分 类 号：O363.2[理学—流体力学]