助剂影响大载荷植保无人机喷洒沉积特性的试验研究

Influence of adjuvant on Large-scale Plant Protection UAV spray characteristics

为了研究助剂对大载荷植保无人机喷雾沉积分布均匀性、雾滴抗飘移性和抗蒸发性的影响,通过添加5种喷雾助剂改变液滴的表面张力,并利用热线风速仪测量了FR-200大载荷植保无人机不同作业环境下的风速和温度,对FR-200大载荷植保无人机的雾滴沉积分布均匀性、抗飘移性和抗蒸发性这3种喷洒沉积特性进行了试验研究.试验采用图像处理软件Deposit Scan分析雾滴沉积参数,获得雾滴沉积分布规律.结果表明:大载荷植保无人机添加喷雾助剂进行施药作业时,能提高靶区范围内的沉积浓度,溶液的表面张力越低、雾滴沉积分布越均匀;在侧风作用下大载荷植保无人机不使用助剂时飘移现象十分明显,加入5种喷雾助剂后均能明显改善雾滴抗飘移性;通过分析不同温度对雾滴沉积的影响,发现温度升高时,添加助剂可以提高大载荷植保无人机喷洒雾滴的沉积浓度,说明助剂可以改善雾滴的抗蒸发性.

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 deposition 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.