数值模拟过冷水滴撞击翼型表面的收集特性  

Numerical method to simulate collection efficiency of supercooled droplets impinging on an airfoil

作　　者：邵晓海 刘星[1] 

机构地区：[1]南京航空航天大学民航学院210016南京

出　　处：《应用力学学报》2015年第2期266-270,354-355,共5页Chinese Journal of Applied Mechanics

摘　　要：为了研究过冷水滴撞击翼型表面的收集特性,本文采用欧拉两相流法建立了气流控制方程和水滴运动控制方程,并采用有限体积法对方程进行了求解。为了使水滴体积分数在数值迭代过程中保持为正值,本文在水滴控制方程中引入了一个变量A,使得迭代过程更加平稳。求解水滴控制方程,并得到了翼型表面的水滴收集特性。对过冷水滴撞击翼型表面的收集特性进行了研究,在平均水滴直径不同的情况下,将单尺寸分布与多尺寸分布情况下的局部收集系数进行了对比;发现:局部收集系数在驻点附近比较一致,随着离驻点的距离越来越大,局部收集系数产生偏差;多尺寸分布的水滴撞击极限远大于单尺寸下的计算值。同时本文还讨论了过冷水滴的大小对局部水收集系数和撞击极限的影响,发现平均水滴直径越大,局部水滴收集系数和撞击区域越大。To compute the supercooled water impingement on airfoil surfaces, a two-phase Eulerian method is used to establish the governing equations for air and droplets, respectively. The finite control volume formulationis proposed to solve the governing equations. The governing equations for droplets do not guarantee the water volume fraction to remain positive during the numerical iteration, occasionally cause numerical instability. To prevent this unphysical possibility, a variable A is introduced in the governing equations for droplets. The local collection efficiency and impingement area are obtained from the solution of the governing equations. In the case of changes in the droplet diameter, the mono-dispersed distribution is compared to the Langumir-D distribution, it is found that local collection coefficient near the stagnation point is almost consistent. As the distance from stagnation point increase, the deviation of the local collection coefficient appears, the size of the limit of the Langumir-D distribution is greater than that of the mono-dispersed distribution. It is also shown that changes in d has a great effect on the local collection efficiencies and impingement limits, the larger the droplet diameter is, the larger the local collection efficiencies and the impingement limits is.

关 键 词：数值模拟 水滴收集特性 有限体积法 撞击极限 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]