College of Electrical and Mechanical Engineering, Hebei Agricultural University, Baoding, China.
National Research Center of Intelligent Equipment for Agriculture, Beijing Academy of Agricultural and Forestry Sciences, Beijing, China.
Pest Manag Sci. 2024 Feb;80(2):473-497. doi: 10.1002/ps.7814. Epub 2023 Oct 24.
We designed an umbrella wind-field-type anti-drift spraying device to improve droplet deposit in the fruit tree canopy, reduce spray drift between fruit tree rows, and avoid uneven droplet deposit in the canopy.
We used Computational Fluid Dynamics combined with wind field tests to optimize the parameters of the anti-drift spray device, and the results showed that airflow velocity at the outlet of the device after optimization was 24.5 m s , which is 48% higher than that before optimization (16.5 m s ) airflow velocity. We designed wind tunnel tests and field tests to analyze the anti-drift characteristics of the anti-drift spraying device. Wind tunnel test results showed that the side airflow velocity, outlet diameter, spray distance, and spray drift ratio were correlated. The mathematical models established by vertical and horizontal multifactor orthogonal tests were significant (P < 0.05, R 0.947, 0.878, respectively). The results of the field tests showed that side airflow, velocity spray pressure and outlet diameter had significant effects on the droplet deposit characteristics (in descending order: the side airflow velocity, spray pressure, and outlet diameter). The maximum droplet deposit was 6.34 μL cm when the side airflow velocity was 2 m s , the spray pressure was 0.4 MPa, and the outlet diameter was 70 mm . When the side airflow velocity exceeded 2 m s , the outlet diameter and spray pressure had to be reduced to ensure better droplet deposit.
The results indicated that the umbrella wind field could reduce spray drift and ineffective deposit in off-target areas and provides a reference for the comprehensive analysis of the spray drift deposit law. © 2023 Society of Chemical Industry.
我们设计了一种伞形风场式防飘移喷雾装置，以提高果树枝冠内的雾滴沉积量，减少行间飘移，避免树冠内雾滴沉积不均匀。
我们使用计算流体力学结合风场测试对防飘移喷雾装置的参数进行了优化，结果表明优化后装置出口处气流速度为 24.5m/s，比优化前提高了 48%（16.5m/s）。我们设计了风洞试验和田间试验来分析防飘移喷雾装置的防飘移特性。风洞试验结果表明，侧风速度、出口直径、喷雾距离和飘移比之间存在相关性。通过垂直和水平多因素正交试验建立的数学模型均显著（P<0.05，R分别为 0.947、0.878）。田间试验结果表明，侧风速度、喷雾压力和出口直径对雾滴沉积特性有显著影响（依次为：侧风速度、喷雾压力和出口直径）。当侧风速度为 2m/s、喷雾压力为 0.4MPa、出口直径为 70mm 时，最大雾滴沉积量为 6.34μL/cm。当侧风速度超过 2m/s 时，必须降低出口直径和喷雾压力，以确保更好的雾滴沉积。
结果表明，伞形风场可以减少喷雾飘移和无效沉积，为综合分析喷雾飘移沉积规律提供了参考。 © 2023 化学工业协会。
