液滴与水平壁面碰撞力的数值研究  

Simulation of Impact Force of Drop Impacting on Horizontal Plate

作　　者：张彬[1] 韩强[1] 袁小芳[1] 李景银[1] 

机构地区：[1]西安交通大学能源与动力工程学院,西安710049

出　　处：《西安交通大学学报》2013年第9期23-27,共5页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(51276137);中央高校基本科研业务费专项资金资助项目

摘　　要：为探究叶轮机械内部液滴与固壁之间碰撞引起的壁面磨损破坏的机理,采用流体体积方法,数值研究液滴直径、碰撞速度和液滴与壁面之间的接触角对液滴与壁面碰撞的瞬态碰撞力发展变化的影响。研究结果表明,液滴与壁面之间的接触角对液滴碰撞过程中的碰撞力几乎没有影响,但对于不同雷诺数和韦伯数下的液滴,其与静止壁面的碰撞力按液滴直径的2.118次方和速度的1.761次方正则化后,碰撞力的无量纲时间曲线基本重合,且碰撞力峰值出现的无量纲时刻为0.26,即同样直径的液滴,碰撞速度越大,到达碰撞力峰值所用时间越短,对同样速度的液滴,液滴直径越大,则液滴到达碰撞力峰值所用时间越长。In order to understand the mechanism of surface erosion caused by the impact of liquid drops on the blade in the turbomachinery, the effects of contact angle, drop diameter and impact velocity on the impact force of a drop colliding with a stationary plate were discussed with the VOF method. The results show that the impact force is slightly affected by the variation in contact angle but considerably influenced by the change in the droplet diameter and impact velocity. Moreover, if the impact force is normalized by the product of the 2. 118th power of the droplet diameter and the 1. 761th power of the droplet impact velocity, the curves of the normalized forces for drops at different Re and We numbers verse dimensionless time almost all collapse into a single curve, and the normalized peak force occurs at the dimensionless time of 0.26. This indicates that the same size drop at a higher velocity experiences its peak impact force at an earlier time while the impact force of a larger drop at the same velocity reaches its peak at a later time.

关 键 词：流体体积方法 碰撞力 数值模拟 碰撞参数 

分 类 号：TK05[动力工程及工程热物理]