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Performance characterization on downwash flow and spray drift of multirotor unmanned agricultural aircraft system based on CFD

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International Journal of Agricultural and Biological Engineering 2022年第3期15卷 1-8页

作者： Hongze Li Hang Zhu Zihao Jiang Yubin Lan School of Mechanical and Aerospace Engineering Jilin UniversityChangchun 130022China School of Agricultural Engineering and Food Science Shandong University of TechnologyZibo 255000ShandongChina Department of Biological and Agricultural Engineering Texas A&M UniversityTexas77843USA

In recent years,multi-rotor Unmanned Aerial Vehicles(UAVs)have been employed in the field of plant protection in *** drift has been considered a major impact in agriculture aerial spraying,and spray quality in the application of plant protection *** downwash including wake vortices and downward wind field plays a major role in the dispersal and deposition of pesticide spray released by nozzle(s)equipped in *** from the fixed-wing UAV,the downwash flow of multi-rotor UAV was result from the rotation of ***,a study on off-target drift and ground deposit concerning the rotor rotation was simulated through a series of Computational Fluid Dynamics(CFD)simulations to obtain the influence of *** discrete Phase Model(DPM)was taken to simulate the motion of droplet particles since it is an appropriate way to simulate discrete phases in flow field and can track particle *** this study,the parameters of CFD simulations were acquired by three kinds of actual replicated *** simulation analysis mainly obtains the droplet drift and deposition rule,the influence of eddy current,and downwash flow caused by the rotor *** results showed that the downwash distribution below different rotors was different owing to the flight angle of inclination,“behind”is the greatest,“middle”is secondly,and“forward”is smallest in value(behind,middle,and forward represent three regions below rotors along flight direction).According to the simulation results,two methods of reducing droplet drift were put forward and specific simulations were carried out to prove their *** results of this study can provide theoretical support for improving the spray quality of UAV and reducing the drift of droplets.

关键词： Unmanned Aerial Vehicles spray drift downward wind field rotor rotation eddy current downwash distribution

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