Experimental Study On Spray Performance Of Aerial Spray System Of Plant Protection UAV

With a growing number of agricultural facilities,precision agriculture has become increasingly efficient and various.One of the most promising applications is unmanned aircraft systems(UAS),which has been an important platform to access the crop information promptly given its high flexibility,compact structure,low cost and high spatial resolution.It provides an opportunity for agricultural chemicals spray application in which the applicator can be removed from close proximity of the spray discharge.However,UAS in precision agriculture is easily affected by environmental factors and spray parameters.The main content of the dissertation involves:1.Build a spray model with ANSYSFLUENT,and use the DPM model to simulate the droplet migration of the double XR8002 nozzle under various combinations of different wind speeds,different nozzle spacing and different spray heights,in order to explore the drift and deposition of fog droplets in the spray process.2.Use the UAV spray performance test bench to carry out the laboratory calibration experiment.Collect the fog drops generated by the double pressure nozzle on the UAV and analyze the deposition amount of the collected fog drops,in order to obtain the variation of spraying effect when the rotor speed and spraying height changes through nine groups of experiments.3.Went to Wujiazhen Town,Fuyu City,Jilin Province to conduct the field spraying experiment.After data processing,the average coverage rate,distribution uniformity,spraying width,deposition amount and deposition density and other parameters of the experiment were obtained.