Numerical Simulation And Experimental Study On Trajectories Of Droplets Of Electrostatic Nozzle With Fixed Wing

With the concern for the ecological environment and plant protection,the plant protection operation requires high efficiency,safety,pesticide savings,and being environmentally friendly.Electrostatic spraying technology has become a research hotspot because the deposition amount and utilization rate is increased.However,the research is rarely about adsorption between electrostatic droplets and target crops.In order to investigate the settling process and trajectory of aerial electrostatic droplets,and enhance the electrostatic charging capability of fixed-wing aerial electrostatic nozzles.In this paper,On the basis of analyzing the influence factors of electrostatic droplet movement,the trajectory of droplets of electrostatic sprayer for fixed wing was simulated by CFD method and test was carried out by high-speed photography,which can provide a new method for further analysis and study of aerial electrostatic spray technology.(1)It is determined by theoretical analysis,charging voltage,droplet falling distance and airflow velocity are the main factors that affecting droplet movement.According to the force analysis,the velocity of droplets was directly proportional to charging voltage and inversely proportional to the distance.The optimum charging voltage was 14 kv,the maximum charge-mass ratio was 1.04mc/kg,and the average particle size was 209.77?m.(2)the trajectory simulation model of droplets was simulated by CFD method,the droplet trajectory was simulated under different conditions.And the accuracy of the model was verified by spray angle and droplet size.The results showed that with the increase of charging voltage,the degree of deflection of droplet trajectories first increases and then decreases.Also,the velocity of electrostatic droplets was greater than condition of the non-electrostatic.Movement and deposition of droplet on target crops was accelerated by Electrostatic.The accuracy of the model was verified.(3)In order to track the movement of droplets,the droplet trajectory test device was built.The images of electrostatic droplets were obtained by using high-speed photography technology.And TEMA software was used to analyze the results of the test.A single droplet trajectory and the velocity were obtained.The results showed that trajectory deflection was occurred through Adsorption between droplets and target crops.the velocity of the electrostatic droplet at the Yaxis and the X axis are greater than the non-electrostatic,raised 3.8 times and 1.6 times,respectively.The increase of droplet velocity in horizontal direction is the key to the movement of droplets,meanwhile,the increase of droplet vertical velocity accelerates the deposition rate of droplets and reduces the drift of droplets.This study lays a foundation for improving electrostatic charging effect of electrostatic droplets and analysis the relationship between electrostatic droplet movement and deposition.