植保无人机喷洒作业雾滴飘移的质点运动学分析  

Particle kinematics analysis of droplet drift in plant protection UAV spraying operation

作　　者：邹雄 徐让书[1] 李景春[1] 刘梓琳 ZOU Xiong;XU Rangshu;LI Jingchun;LIU Zilin(Liaoning Key Laboratory of Advanced Measurement and Test Technology for Aircraft Propulsion Systems, Shenyang Aerospace University, Shenyang, Liaoning 110136, China)

机构地区：[1]沈阳航空航天大学辽宁省航空推进系统先进测试技术重点实验室,辽宁沈阳110136

出　　处：《排灌机械工程学报》2021年第11期1177-1181,1188,共6页Journal of Drainage and Irrigation Machinery Engineering

基　　金：2017年辽宁省自然科学基金资助项目(20170540711)。

摘　　要：为了研究雾滴飘移对植保无人机喷洒作业质量的影响,基于多相流理论和质点运动学方法,对植保无人机喷洒的雾滴其受力和运动轨迹进行了理论分析与数学建模.在对近地面层和层流副层风速进行假设的基础上,即假设风速测量高度范围内的风速近似为线性函数分布,进行方程耦合迭代求解,分析了雾滴直径、飞行高度、飞行速度大小和航向、风速大小和风向、雾滴初始速度大小和方向对雾滴飘移的影响.进一步讨论了各因素之间耦合作用对雾滴飘移的影响,得到雾滴飘移浓度分布情况.结果表明:风速和风向对雾滴飘移距离影响较大;雾滴飘移距离和初始速度角度呈二次函数分布,在所给条件下经计算得出初始速度角在20°左右飘移距离最近;雾滴飘移主要集中分布在喷嘴周围,并且呈散射状分布.In order to study the effect of droplet drift on spray quality of plant protection UAV,based on the theory of multiphase flow and the method of particle kinematics,the force and motion trajectory of droplet sprayed by plant protection UAV were theoretically analyzed and mathematically modeled.On the basis of the assumption of the velocity of wind in the ground layer and the laminar sublayer,that is,it is assumed that the velocity of the wind in the area of wind measurement is approximately a linear distribution.Then coupling iterative solution of the equation was carried out,and the influence of droplet diameter,flight altitude,the magnitude and direction of the velocity of the UAV,the magnitude and direction of the velocity of the wind,the magnitude and direction of the initial velocity of the droplet to droplet drift were analyzed.Further,the influence of the coupling action between various factors on droplet drift to get the concentration distribution of droplet drift was discussed.The results show that the magnitude and direction of the velocity of the wind have much influence on the drift distance of the droplets,and the drift distance and the initial velocity angle show a quadratic function distribution.Under the given conditions,it is calculated that the initial velocity angle is the closest to the drift distance at about 20°.The droplet drift is mainly distributed scatteredly around the nozzle.

关 键 词：植保无人机 雾滴飘移 质点运动学 浓度分布 耦合 

分 类 号：S277.9[农业科学—农业水土工程]