关键词: 植保无人机, 数值模拟, 飞行高度, 飞行速度, 风速

Abstract: In order to explore the impact of multi-rotor plant protection UAV on pesticide application under different working conditions, the advantages and disadvantages of the structural design of two multi-rotor plant protection UAVs were clarified, and the parameter settings of plant protection UAV in flight prevention operations was standardized. In this experiment, two multi-rotor plant protection UAVs were used to simulate the flow field distribution, wind field width and drift of UAVs under different working conditions. The results showed that the main wind field width of the two types of plant protection UAVs could reach 6-12 m, and the secondary wind field width could reach 12-20 m. Increasing flight altitude and speed could achieve a larger spraying area, but the wind field penetration was weakened and the distance of fog droplet drift was increased. Working in the downwind direction was beneficial for improving the spraying effect. Compared with the  six-rotor crop protection drones, the four-rotor  crop protection drones have better balance, advantages in downforce and anti drift ability and a uniform and orderly wind field distribution, which is more conducive to uniform spraying. The research results can provide ideas for the structure optimization of plant protection UAV and theoretical basis for the setting of flight control operation parameters of plant protection UAV.

Key words:  plant protection UAV, numerical simulation, flight height, flight speed, wind speed