水滴在撞击不同厚度水膜条件下产生的二次液滴特性  

Characteristics of Secondary Droplets Produced During Impact Process of a Water Droplet on Water Film of Different Thicknesses

作　　者：周博通 杨志刚 易贤[3] 杜雁霞[4] 熊兵 徐毅 吴凌昊 金哲岩[1,2] ZHOU Botong;YANG Zhigang;YI Xian;DU Yanxia;XIONG Bing;XU Yi;WU Linghao;JIN Zheyan(School of Aerospace Engineering and Applied Mechanics,Tongji University,Shanghai 200092,China;Shanghai Key Laboratory of Vehicle Aerodynamics and Vehicle Thermal Management Systems,Shanghai 201804,China;Key Laboratory of Icing and Anti/De-icing of Aircraft,China Aerodynamics Research and Development Center,Mianyang 621000,China;State Key Laboratory of Aerodynamics,China Aerodynamics Research and Development Center,Mianyang 621000,China;AECC Sichuan Gas Turbine Establishment,Mianyang 621000,China)

机构地区：[1]同济大学航空航天与力学学院,上海200092 [2]上海市地面交通工具空气动力与热环境模拟重点实验室,上海201804 [3]中国空气动力研究与发展中心结冰与防除冰重点实验室,四川绵阳621000 [4]中国空气动力研究与发展中心空气动力学国家重点实验室,四川绵阳621000 [5]中国航发四川燃气涡轮研究院,四川绵阳621000

出　　处：《同济大学学报（自然科学版）》2023年第7期1124-1132,共9页Journal of Tongji University:Natural Science

基　　金：国家数值风洞工程(NNW2019ZT2-B26)。

摘　　要：采用高速相机对水滴撞击水膜的飞溅过程进行了详细测量,分析了水滴撞击水膜的飞溅临界值、二次液滴的直径分布和二次液滴的速率等飞溅特性。结果表明,在实验参数范围内,当韦伯数增大时发生飞溅现象。此外,可以使用量纲为一参数K来描述飞溅临界值,K=We·Oh-0.4。当K值大于2 100时发生飞溅现象,二次液滴的量纲为一直径和二次液滴的量纲为一速率随着K值的增大而增大。水膜量纲为一厚度对二次液滴直径分布的影响不明显,但由冠状水花产生的二次液滴的平均量纲为一速率随水膜量纲为一厚度的增加而减小。The splashing dynamics of a water droplet impacting a water film was experimentally investigated by a high-speed camera.The splashing limit,the size distribution of secondary droplets,and the velocity of secondary droplets were analyzed.The results show that within the range of the experimental parameters,the splashing occurs when the Weber number increases.The dimensionless parameter K(K=We·Oh-0.4)could be used to describe the splashing limit.When K>2100,splashing phenomenon happens.In addition,with the increase of the K number,both the dimensionless secondary droplet diameter and the dimensionless velocity of secondary droplets increase.The effect of dimensionless film thickness on the diameter distribution of secondary droplets is not significant.However,the average dimensionless velocity of secondary droplets produced by crown splashing decreases with the increment of dimensionless film thickness.

关 键 词：水滴撞击 水膜 飞溅 二次液滴 

分 类 号：O359.1[理学—流体力学]