The Effects of Lateral Wind and Droplet Size on the Droplet Drift Characteristics of Fan-shaped Nozzles for Aerial Spraying

Shende Chen, Junyu Liu, Kun Chang, Jianzhou Guo, Shiyun Hu, Xiaojie Xu, Yubin Lan

Abstract


Abstract: To investigate the effects of lateral wind speed and droplet size on the deposition of droplets sprayed by aviation-specific fan-shaped nozzles in aerial spraying operations, this paper takes the Teejet series 01, 03 and 05 aperture fan-shaped pressure nozzles as the research objects, and studies the drift distribution of droplets when the lateral wind speed is 2, 4, 6 m/s and the droplet volume median diameter (DV50) is 100, 150, 200 ?m respectively, and builds a nozzle drift model based on the experimental results.  The results show that the lateral wind speed and droplet size have significant effects on the horizontal and vertical drift distribution of the nozzle droplets, and the droplet drift rate increases with the increase of lateral wind speed and the decrease of droplet size.  In addition, the droplet drift distance also increases significantly with the increase of lateral wind speed, and when the wind speed increases from 2 m/s to 6 m/s, the 90% drift distance of droplets increases from about 9 m to about 12 m; and when the lateral wind speed is 4 m/s, the droplet drift is more serious, exceeding 40%; and with the increase of wind speed, the droplet drift will also increase.  Therefore, it is suggested that plant protection unmanned aerial vehicle (UAV) should choose to operate under the condition of wind speed less than 4 m/s as far as possible in field operations, and increase the droplet size appropriately when necessary to reduce the degree of droplet drift.  The research results provide theoretical and data support for optimizing the drift distribution characteristics of aviation fan-shaped nozzles, and have certain guiding significance for practical spraying operations.

Keywords: fan-shaped nozzle; droplet; wind speed; droplet size; drift

DOI: 10.33440/j.ijpaa.20230601.210

 

Citation: Chen S D, Liu J Y, Chang K, Guo J Z, Hu S Y, Xu X J, and Lan Y B.  The effects of lateral wind and droplet size on the droplet drift characteristics of fan-shaped nozzles for aerial spraying.  Int J Precis Agric Aviat, 2023; 6(1): 16–22.


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