Design of Narrow-arc Fan-shaped Anti-drift Nozzle Based on Entrainment Effect of Fruit Tree Canopy of UAV
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摘要: 针对植保无人机对果树冠层喷洒易产生的药液漂移问题，结合植保无人机对果树喷洒时产生的卷吸效应和扇形喷嘴雾化原理，设计了一种窄弧扇形喷嘴结构，并通过对不同冠层压力损失系数下的喷洒过程进行仿真分析，得到最佳防漂移的窄弧扇形喷嘴结构参数。研究结果表明：喷嘴内径增大，液膜与液带结构趋于稳定，液滴分布均匀，沉积率呈先降后升趋势；冠层压力损失系数降低，粒径频谱宽度减小，但沉积率总体提高；对较厚冠层果树植保时，选择内径1.3 mm、狭缝宽度0.15 mm的喷嘴，防漂移性能较好；对较薄冠层果树植保时，选择内径1.03 mm、狭缝宽度0.2 mm的喷嘴，防漂移性能较好；采用窄弧扇形喷嘴的液滴频谱宽度>0.7,沉积率>94.1%。Abstract: Aiming at the problem of liquid drift caused by plant protection UAV spraying fruit tree canopy, a narrow arc fan nozzle structure is designed by combining the entrainment effect and fan nozzle atomization principle when plant protection UAV sprays fruit tree canopy, through the simulation analysis of the spraying process under different canopy pressure coefficients, the structural parameters of the narrow-arc fan-shaped nozzle with the best anti-drift were obtained. The results show that as the inner diameter of the nozzle increases, the structure of the liquid film and liquid belt tends to be stable, the distribution of droplets is uniform, and the deposition rate first decreases and then increases; the canopy pressure loss coefficient decreases, and the width of the particle size spectrum decreases, but the overall deposition rate improvement.For thick canopy fruit tree planting, choose a nozzle with an inner diameter of 1.30 mm and a slit width of 0.15 mm, with a particle size spectrum width of 0.706 and a deposition rate of 95.2%.For plant protection of thin canopy fruit trees, choose an inner diameter of 1.03 mm and a slit width of 0.20 mm, the nozzle has a particle size spectrum width of 0.858 and a deposition rate of 98.2%. The droplet spectrum of the narrow-arc fan-shaped nozzle is greater than 0.7, and the deposition rate is greater than 94.1%.
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