CFD Simulation of Low-attitude Droplets Deposition Characteristics for UAV based on Multi-feature Fusion

Abstract The movement and deposition patterns of pesticide liquids in complex airflow field were difficult to determine, and thus led to some problems such as low utilization efficiency of pesticide and reduce quality of agricultural products. By using CFD technology, simulation test was carried out to study the droplet deposition characteristics within range of -1.5m to 4m in the downwind direction of UAV based on multi-feature fusion. The simulation boundary conditions and simulation parameters of 3-dimentional air field space were defined according to the spraying parameters measured from the UAV. The results showed that: droplet deposition was distributed in parabolic form. The deposition of droplets decreased with the increase of airflow velocity and spray height, and deposits scale was gradually moved away from the nozzle. When airflow velocity was greater than 3m/s, or spray height was more than 1.3m, it was not suitable for spraying. The deposition increased with the increase of droplet size, and deposits scale reduced. The change of spray angle caused a certain influence on distribution of droplet deposition, and it was a main factor that affects deposition characteristic. The result would provide a theoretical reference for spraying parameters determination and operating conditions selection.