Abstract
The downwash flow field of the multi-rotor unmanned aerial vehicle (UAV), formed by propellers during operation, has a significant influence on the deposition, drift and distribution of droplets as well as the spray width of the UAV for plant protection. To study the general characteristics of the distribution of the downwash airflow and simulate the static wind field of multi-rotor UAVs in hovering state, a 3D full-size physical model of JF01-10 six-rotor plant protection UAV was constructed using SolidWorks. The entire flow field surrounding the UAV and the rotation flow fields around the six rotors were established in UG software. The physical model and flow fields were meshed using unstructured tetrahedral elements in ANSYS software. Finally, the downwash flow field of UAV was simulated. With an increased hovering height, the ground effect was reduced and the minimum current velocity increased initially and then decreased. In addition, the spatial proportion of the turbulence occupied decreased. Furthermore, the appropriate operational hovering height for the JF01-10 is considered to be 3 m. These results can be applied to six-rotor plant protection UAVs employed in pesticide spraying and spray width detection.
Highlights
In the application of spraying during plant protection, the downwash flow field of multi-rotor unmanned aerial vehicles (UAV) directly drives the spraying droplets to the crop canopy
Some research has focused on the distribution and properties of the downwash flow field of UAVs used in plant protection
The 3D full-size physical model of JF01-10 six-rotor plant protection UAV was constructed in SolidWorks 2013
Summary
In the application of spraying during plant protection, the downwash flow field of multi-rotor unmanned aerial vehicles (UAV) directly drives the spraying droplets to the crop canopy. Delele et al.[17] studied the characteristics of droplets and influence on the plant surface using a CFD model These studies were not in the same area, they offered useful information for the study of UAV spraying. Shi et al.[18] used this approach to study the major movement form and speed change of the downwash flow field for a small unmanned helicopter in ultra-low-altitude flight; Zhang et al.[19] simulated the deposition and drift of pesticide droplets under constrained conditions. By comparing the wind fields at different hovering heights, the entire distribution pattern of wind fields was established
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