壁面温度对油滴撞壁铺展的影响  

Influence of Wall Temperature on Oil Droplet Impingement Spreading

作　　者：张亚鲁 胡玉平[1] 李国祥[1] ZHANG Yalu;HU Yuping;LI Guoxiang(School of Energy and Dower Engineering,Shandong University,Jinan 250061,China)

机构地区：[1]山东大学能源与动力工程学院,山东济南250061

出　　处：《内燃机与动力装置》2018年第5期16-20,37,共6页Internal Combustion Engine & Powerplant

摘　　要：利用Level Set与VOF耦合(coupled level set and volume of fluid,CLSVOF)数值模拟和能量理论分析的方法,研究发动机冷起动时的油滴撞击冷壁面现象及壁面温度对油滴撞壁铺展结果的影响。结果表明:壁面温度造成油滴表面张力系数、动力黏度和速度梯度的改变;壁面温度越低,油滴的最大铺展系数越大。Through the analytical method of numerical simulation and energy theory of the CLSVOF(coupled level set and volume of fluid),the effect of oil droplet impact on cold wall and wall temperature on the results of oil droplet wall spreading during cold start of engine was studied.It is found that the wall temperature results in the change of the surface tension coefficient,dynamic viscosity and velocity gradient of the oil droplets,and the lower the wall temperature,the larger the maximum spreading coefficient of the oil droplets.

关 键 词：液滴撞壁 壁面温度 黏温特性 CLSVOF 

分 类 号：TK412.4[动力工程及工程热物理—动力机械及工程]