PDF(Pubmed)
Abstract：
This study investigates the impact of varying side wind velocities and nozzle inclination angles on droplet penetration during plant protection spraying operations, focusing on citrus trees. Experiments were conducted across four wind speed levels (0, 1, 2, 3 m/s) perpendicular to the nozzle direction and seven nozzle inclination levels (0°, 8°, 15°, 23°, 30°, 38°, 45°) to evaluate droplet distribution under different spraying parameters. A baseline condition with 0 m/s wind speed and a 0° nozzle angle served as the control. Utilizing Computational Fluid Dynamics (CFD) and regression analysis techniques in conjunction with field trials, the droplet penetration was analyzed. Results indicate that at constant wind speeds, adjusting the nozzle inclination angle against the direction of the side wind can significantly enhance droplet deposition in the canopy, with a 23° inclination providing the optimal increase in deposition volume, averaging a change of +16.705 μL/cm2. Multivariate nonlinear regression analysis revealed that both wind speed and nozzle inclination angle significantly affect the droplet penetration ratio, demonstrating a correlation between these factors, with wind speed exerting a greater impact than nozzle angle. Increasing the nozzle inclination angle at higher wind speeds improves the penetration ratio, with the optimal parameters being a 23° angle and 3 m/s wind speed, showing a 12.6% improvement over the control. The model fitted for the impact of nozzle angle and wind speed on droplet penetration was validated through field experiments, identifying optimal angles for enhancing penetration at wind speeds of 1, 2, and 3 m/s as 8°, 17°, and 25°, respectively. This research provides insights for improving droplet penetration techniques in plant protection operations.
摘要：
这项研究调查了在植物保护喷涂操作期间，不同的侧风速和喷嘴倾角对液滴渗透的影响，专注于柑橘树。在垂直于喷嘴方向的四个风速水平（0、1、2、3m/s）和七个喷嘴倾斜水平（0°，8°,15°,23°,30°,38°,45°)来评价不同喷雾参数下的液滴分布。具有0m/s风速和0°喷嘴角度的基线条件用作控制。利用计算流体动力学（CFD）和回归分析技术结合现场试验，分析了液滴渗透。结果表明，在恒定的风速下，相对于侧风方向调整喷嘴倾斜角度可以显着增强雨滴在雨篷中的沉积，以23°的倾斜度提供沉积量的最佳增加，平均变化为+16.705μL/cm2。多元非线性回归分析表明，风速和喷嘴倾角均显着影响液滴穿透率，证明了这些因素之间的相关性，风速比喷嘴角度施加更大的影响。在较高风速下增加喷嘴倾角可提高穿透率，最佳参数为23°角和3米/秒风速，比对照组提高了12.6%。通过现场实验验证了喷嘴角度和风速对液滴渗透影响的模型。确定在1、2和3m/s的风速下增强穿透力的最佳角度为8°，17°,25°,分别。这项研究为改善植物保护操作中的液滴渗透技术提供了见解。
