水滴撞击非牛顿除冰液液膜动力学行为特性数值研究  

Numerical Study on Dynamic Behavior of Non-Newtonian De-icing Liquid Film Impacted by Water Droplets

作　　者：崔静 岳茂昌 姜德政 常义浩 杨广峰 CUI Jing;YUE Maochang;JIANG Dezheng;CHANG Yihao;YANG Guangfeng(College of Aeronautical Engineering,Civil Aviation University of China,Tianjin 300300,P.R.China)

机构地区：[1]中国民航大学航空工程学院,天津300300

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2023年第S01期13-28,共16页南京航空航天大学学报（英文版）

基　　金：supported in part by the National Natural Science Foundation of China(No.52076212);the Tianjin Research Innovation Project for Postgraduate Students(No.2022SKYZ359).

摘　　要：冻雨天气下,过冷大水滴撞击到除冰液液膜后会发生溅射、铺展、互溶等物理过程,除冰液液膜温度降低、浓度下降,液膜冰点上升、黏度下降,引发液膜滑落脱离,大幅缩短防冰保持时间。本文针对冻雨天气下飞机除冰液液膜失效行为开展数值研究,基于流体体积法,并结合组分输运方程,构建了多相、多组分、多体系、多场耦合的水滴撞击非牛顿除冰液液膜的动力学行为模型。基于该数值模型,研究了水滴撞击非稳态过程的动力学行为以及液膜的稀释、降粘等非牛顿流变特性。研究表明:液膜初始浓度越高,对水滴液冠生长抑制程度越大,撞击后水滴的铺展直径越小,水滴和除冰液液膜的碰撞区域的水分输运迁移现象越明显,除冰液液膜在剪切稀释和浓度降低的耦合作用下,黏度下降幅度越明显;水滴初始直径越大,水滴对液膜的作用范围越大,液膜黏度下降幅度越大;水滴的下落撞击速度越大,水滴在液膜内组分迁移速度越快,液膜黏度损耗越明显。In freezing rainy weather,physical processes,such as sputtering,spreading,and miscibility,will occur after the supercooled large water droplets hit the liquid film of the de-icing liquid,the temperature and concentration of the liquid film of the de-icing liquid will decrease,the freezing point of the liquid film will rise and the viscosity will decrease,causing the liquid film to slide and detach and greatly shortening the anti-icing holding time.Based on the volume of fluid(VOF)method and combined with the component transport equation,a dynamic behavior model of multi-phase,multi-component,multi-system,multi-field coupled water droplet hitting non-Newtonian de⁃icing liquid film is constructed.Based on this numerical model,the kinetic behavior of water droplet hitting the unsteady state process and the non-Newtonian rheological characteristics,such as dilution and viscosity reduction of liquid film,are studied.The results show that the higher the initial concentration of the liquid film,the greater the degree of inhibition of the growth of the water droplet crown,the smaller the spreading diameter of the water droplet after impact,the more obvious the water transport migration phenomenon in the collision area of the water droplet and the de-icing liquid film,and the more obvious the viscosity decrease of the de-icing liquid film under the coupling effect of shear dilution and concentration reduction.The larger the initial diameter of the water droplet,the larger the range of the water droplet on the liquid film,and the greater the decrease in the viscosity of the liquid film.The greater the falling impact speed of the water droplet,the faster the migration rate of the components of the water droplet in the liquid film,and the more obvious the viscosity loss of the liquid film.

关 键 词：除冰液液膜 多相多体系 非牛顿 剪切稀释 组分迁移 

分 类 号：O359[理学—流体力学]