Research on downwash flow and droplet distribution of four-rotor plant protection UAV coupling with wind field
In the spraying process of the rotor plant protection UAV,the droplets is highly coupled with downwash flow field generated by the rotation of rotor and the external wind field,which directly affects the spraying quality.Therefore,based on the Lagrangian multiphase flow model,this paper conducts numerical analysis and calculation on the downwash flow of the four-rotor plant protection UAV with coupled wind field,the distribution of droplets with or without downwash,and the distribution of droplets with wind field.The reliability of the numerical calculation method is verified by the rotor wind speed measurement test.The results show that the rotor downwash flow attracts each other on the vertical line between the axes,and the flow convergence will occur.The maximum airflow velocity is 14 m/s.With the effect of the wind field,the airflow on the windward side is squeezed and gradually deflects to the leeward side.When the wind speed exceeds 3 m/s,the down wash flow has gradually lost its ability to resist wind interference.The deposition time with down wash flow is 10 times faster than that without down wash flow,which improves the application efficiency.The increase of wind speed leads to the larger deposition range of droplets and the phenomenon of re-spraying is more serious when the wind speed reaches 2-3 m/s.
plant protection UAVcomputational fluid dynamicsnumerical simulationdown wash flowdroplet distribution
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