方柱微结构内气液界面振荡特性数值研究  

Numerical Simulation of Interfacial Oscillation Inside a Micro-pin-finned Structure

作　　者：王素龙 杜王芳[1,3] 何发龙 赵彦琳 姚军[2] 赵建福[1,3] WANG Sulong;DU Wangfang;HE Falong;ZHAO Yanlin;YAO Jun;ZHAO Jianfu(Key Laboratory of Microgravity,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190;College of Mechanical and Transportation Engineering,China University of Petroleum(Beijing),Beijing 102249;College of Engineering Science,University of Chinese Academy of Sciences,Beijing 100049;School of Energy and Safety Engineering,Tianjin Chengjian University,Tianjin 300384)

机构地区：[1]中国科学院力学研究所微重力重点实验室,北京100190 [2]中国石油大学(北京)机械与储运工程学院,北京102249 [3]中国科学院大学工程科学学院,北京100049 [4]天津城建大学能源与安全工程学院,天津300384

出　　处：《空间科学学报》2024年第5期863-872,共10页Chinese Journal of Space Science

基　　金：国家重点研发计划项目资助(2022YFF0503502)。

摘　　要：重力突然下降引起的气液界面振荡和重构对空间流体管理具有重要影响.考虑到贮箱壁面润湿特性在该问题中的重要作用,借鉴传热强化领域方柱微结构表面设计思想,提出一种利用方柱微结构壁面对液体振荡的衰减作用实现空间贮箱被动防晃的方法.采用流体体积法(VOF)对一种方柱微结构形成的异形基本单元内气液界面振荡特性进行数值模拟,分析自由液面随时间的变化特征,并讨论系统振荡频率、阻尼特性等与能量耗散特性密切相关的参数变化规律.研究发现,初始液位主要影响液面振幅,振幅随着初始液位高度的减小而增大,但是液位过低时振荡过程会出现液面触底而加剧耗散;接触角对振幅和阻尼比都有影响,接触角增大,振幅和阻尼比均有所减小.The oscillation and reconstruction of gas-liquid interface caused by sudden drop of gravity is of great significance to space fluid management.Taking into account of the important role of the tank wall’s wetting characteristics,this paper draws on the idea of designing the surface of the square column micro-structure in the field of heat transfer enhancement,and puts forward a passive anti-shaking idea of the space tank by using the damping effect of the square column micro-structure wall on the liquid oscillation.In addition,the gas-liquid interface oscillation characteristics in a special-shaped basic unit formed by a square column microstructure were numerically simulated by using the Volume of Fluid(VOF)method,and the variation of the free liquid surface characteristics with time was analyzed.In particular,the oscillation frequency,damping characteristics and other parameters closely related to the energy dissipation characteristics of the system were discussed,which provided the reference basis for space applications.The results show that the gas-liquid interface within the square-column microstructure produces a repositioning phenomenon accompanied by damped oscillations when gravity plummets from a strongly overloaded state.The initial liquid level height mainly affects the amplitude of the liquid surface oscillation.An initial liquid level lower than 30μm leads to a bottoming out of the liquid surface during the oscillation process,which increases the damping ratio.In the absence of bottoming out,the higher the initial level is,the lower the amplitude of the oscillation is.The contact angle affects the amplitude and damping ratio of the oscillation process,and both the amplitude and damping ratio decrease gradually as the contact angle increases.In a wide gravity range,the magnitude of the final gravity level is between microgravity and 10 times normal gravity,the gas-liquid two-phase flow characteristics inside the square-column microstructures are similar,and the gravity effect is rather weak.

关 键 词：微重力 晃动 气液界面 空间流体管理 

分 类 号：O359.1[理学—流体力学] V448.21[理学—力学]