风速对雨滴形状及下落速度的影响研究  

Effects of Wind Speed on Shape and Fall Velocity of Raindrops

作　　者：卢会国[1] 贾宁 蒋娟萍[1] LU Huiguo;JIA Ning;JIANG Juanping(College of Electronic Engineering,Chengdu University of Information Technology,Chengdu 610225,China)

机构地区：[1]成都信息工程大学电子工程学院,四川成都610225

出　　处：《成都信息工程大学学报》2021年第3期270-274,共5页Journal of Chengdu University of Information Technology

基　　金：国家自然科学基金资助项目(42075129)。

摘　　要：为研究风速对雨滴形状和下落速度的影响,忽略其他因素分析雨滴下落过程中的受力情况,通过Beard和Chuang模型发现雨滴直径大于1 mm时雨滴发生形变,在只考虑水平风应力和空气阻曳力的作用下,通过建立模型观察水平风速影响雨滴水平末速度的变化过程。结果表明,当风速较小时雨滴更圆润,随着风速的增加雨滴形变更大。当风速小的时候平均粒子大小更大,反之随着风速的增加雨滴的直径变小,分析可能是风导致雨滴破裂产生的结果。In order to study the influence of wind speed on the shape and fall velocity of raindrops,the other factors to analyze the force in the process of raindrops falling were first ignored,which is found that the raindrops deformation occurs when the diameter of raindrops is larger than 1mm by Beard and Chuang models.Under the effect of horizontal wind stress and air drag force only,a model is established to observe the process by which the horizontal wind speed affects the final horizontal velocity of raindrops.The results show that when the wind speed is small,the raindrops are more rounded,and the shape of the raindrops changes greatly with the increase of wind speed.When the wind speed is small,the average particle size is larger.On the contrary,the diameter of the raindrops becomes smaller as the wind speed increases.Through analysis,it may be the result of the breakage of the raindrops caused by the wind.

关 键 词：水平风 雨滴 形变 末速度 BC模型 

分 类 号：P426.55[天文地球—大气科学及气象学]