Numerical Simulation of the Trajectory of UAVs Electrostatic Droplets Based on VOF-UDF Electro-Hydraulic Coupling and High-Speed Camera Technology

The electrostatic spray technology can significantly improve the utilization rate of liquid medicine under operation characteristics unmanned aerial vehicles (UAVs) with small load and low volume. To explore settlement law droplets, further amount droplets deposited in target crops, reduce loss missing target, this study adopted method combining numerical simulation high-speed photography to movement UAV induction conical nozzle. Based on droplet spatial dynamics theory, a user-defined function volume fluid (UDF-VOF) multiphase model is established simulate trajectory droplet. TEMA software used analyze motion image field, characteristic parameters, such as velocity are obtained. Theoretical analysis test results show that main factors affecting charging voltage, falling distance, airflow velocity. optimal voltage 14 kv, maximum charge-mass ratio 1.04 mC/kg, average particle size 209.77 μm. height, lateral wind speed have significant effects sedimentation. camera induced electric field causes adsorb crop, resulting deflection.