Abstract:In order to improve the uniformity of spray distribution, droplet anti-drift and evaporation resistance of Large-scale Plant Protection unmanned aerial vehicle(UAV), 5 kinds of spray adjuvant were added to study the deposition and drift of droplet distribution in FR-200 fuel powered UAV. The wind speed and temperature of the FR-200 fuel powered UAV under different working conditions were measured by hot wireanemometer.The image processing software DepositScan was used to analyze the droplet deposition parameters to obtain the distribution of droplet deposition.The results show that when the Large-scale Plant Protection was added with spray adjuvant for application, it can increase the de-position concentration within the target area. The lower the surface tension of the solution, the more uniform the droplet deposition distribution. Under the lateral wind, when the Plant Protection UAV does not use adjuvant, the drift phenomenon is very obvious. After adding 5 kinds of spray adjuvant, the fog drift resistance can be obviously improved. By analyzing the influence of different temperatures on the droplet deposition, it is found that when the temperature rises, the agent can increase the deposition concentration of spray droplets of the large-scale plant protection UAV, indicating that the additive can improve the evaporation resistance of the droplet.