Simulation analysis on characteristics of droplet deposition base on CFD discrete phase model

In order to analyze the effect on the droplet drifting made by the airflow, the discrete phase particle tracking technology was used to get the characteristics of the droplet deposition in different spraying conditions, based on the CFD theory. The virtual cube was in the dimension of 3 m×2 m×2 m with a sprayer nozzle at the top（ the geometrical center of abaxial surface for cube）. The characteristics of droplet deposition were simulated with the optimized boundary conditions at the different height of deposition, ranging from 0.25 to 2 m, and at the different speed of the wind, from 0 to 3 m/s. The results showed that the distribution of the droplets were different at the different speed of the wind. The droplet deposition decreased when both the height of the droplet section and the speed of the wind increased, of which the maximum was 100 %(at the height of 0.25 m and the speed of 0), and the minimum was 7.2%(at the height of 2 m and the speed of 3 m/s). The maximum and minimum of droplet deposition ratio was 79.07%, 3.98%, respectively，and prediction models of the droplet deposition and the droplet ratio were established based on technology mentioned in this paper, which provides a reference for precise pesticide application.