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Movement Characteristics of Droplet Deposition in Flat Spray Nozzle for Agricultural UAVs

Author

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  • Shiyun Hu

    (College of Electronic Engineering (College of Artificial Intelligence), South China Agricultural University, Guangzhou 510642, China
    National Center for International Collaboration Research on Precision Agricultural Aviation Pesticides Spraying Technology, South China Agricultural University, Guangzhou 510642, China)

  • Xiaojie Xu

    (College of Electronic Engineering (College of Artificial Intelligence), South China Agricultural University, Guangzhou 510642, China
    National Center for International Collaboration Research on Precision Agricultural Aviation Pesticides Spraying Technology, South China Agricultural University, Guangzhou 510642, China)

  • Junyu Liu

    (College of Electronic Engineering (College of Artificial Intelligence), South China Agricultural University, Guangzhou 510642, China
    National Center for International Collaboration Research on Precision Agricultural Aviation Pesticides Spraying Technology, South China Agricultural University, Guangzhou 510642, China)

  • Jianzhou Guo

    (College of Electronic Engineering (College of Artificial Intelligence), South China Agricultural University, Guangzhou 510642, China
    National Center for International Collaboration Research on Precision Agricultural Aviation Pesticides Spraying Technology, South China Agricultural University, Guangzhou 510642, China)

  • Runhong Guan

    (College of Electronic Engineering (College of Artificial Intelligence), South China Agricultural University, Guangzhou 510642, China
    National Center for International Collaboration Research on Precision Agricultural Aviation Pesticides Spraying Technology, South China Agricultural University, Guangzhou 510642, China)

  • Zhiyan Zhou

    (College of Engineering, South China Agricultural University, Guangzhou 510642, China)

  • Yubin Lan

    (College of Electronic Engineering (College of Artificial Intelligence), South China Agricultural University, Guangzhou 510642, China
    National Center for International Collaboration Research on Precision Agricultural Aviation Pesticides Spraying Technology, South China Agricultural University, Guangzhou 510642, China)

  • Shengde Chen

    (College of Electronic Engineering (College of Artificial Intelligence), South China Agricultural University, Guangzhou 510642, China
    National Center for International Collaboration Research on Precision Agricultural Aviation Pesticides Spraying Technology, South China Agricultural University, Guangzhou 510642, China)

Abstract

At present, research on aerial spraying operations with UAVs mainly focuses on the deposition outcomes of droplets, with insufficient depth in the exploration of the movement process of droplet deposition. The movement characteristics of droplet deposition as the most fundamental factors affecting the effectiveness of pesticide application by UAVs are of great significance for improving droplet deposition. This study takes flat spray nozzles as the research object, uses the Particle Image Velocimetry (PIV) technique to obtain movement data of water droplet deposition under the influence of rotor flow fields, and investigates the variation characteristics of droplet deposition speed under different influencing factors. The results show that the deposition speed and the distribution area of high-speed (>12 m/s) particles increase with the increase of rotor speed, spraying pressure, and nozzle size. When the rotor speed increases from 0 r/min to 1800 r/min, the average increase in maximum droplet deposition speed for nozzle models LU120-02, LU120-03 and LU120-04 is 33.26%, 19.02%, and 7.62%, respectively. The rotor flow field significantly increases the number of high-speed droplets, making the dispersed droplet velocity distribution more concentrated. When the rotor speed is 0, 1000, 1500, and 1800 r/min, the average decay rates of droplet deposition speed are 36.72%, 20.00%, 15.47%, and 13.21%, respectively, indicating that the rotor flow field helps to reduce the decrease in droplet deposition speed, enabling droplets to deposit on the target area at a higher speed, reducing drift risk and evaporation loss. This study’s results are beneficial for revealing the mechanism of droplet deposition movement in aerial spraying by plant protection UAVs, improving the understanding of droplet movement, and providing data support and guidance for precise spraying operations.

Suggested Citation

  • Shiyun Hu & Xiaojie Xu & Junyu Liu & Jianzhou Guo & Runhong Guan & Zhiyan Zhou & Yubin Lan & Shengde Chen, 2024. "Movement Characteristics of Droplet Deposition in Flat Spray Nozzle for Agricultural UAVs," Agriculture, MDPI, vol. 14(11), pages 1-17, November.
    • Handle: RePEc:gam:jagris:v:14:y:2024:i:11:p:1994-:d:1515438
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    References listed on IDEAS

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    1. Muyesaier Tudi & Huada Daniel Ruan & Li Wang & Jia Lyu & Ross Sadler & Des Connell & Cordia Chu & Dung Tri Phung, 2021. "Agriculture Development, Pesticide Application and Its Impact on the Environment," IJERPH, MDPI, vol. 18(3), pages 1-23, January.
    2. Zongru Liu & Rong Gao & Yinwei Zhao & Han Wu & Yunting Liang & Ke Liang & Dong Liu & Taoran Huang & Shaoqiang Xie & Jia Lv & Jiyu Li, 2024. "Study on the Characteristics of Downwash Field Range and Consistency of Spray Deposition of Agricultural UAVs," Agriculture, MDPI, vol. 14(6), pages 1-29, June.
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    Cited by:

    1. Zhanxing Mao & Xinyu Xue & Zhu Sun & Yang Xu & Qingqing Zhou & Yuxuan Jiao & Haiwei Zhou & Suming Ding, 2025. "Design and Testing of a PLC-Controlled Pressure Stabilization System for Targeted Spraying on Heading Vegetables," Agriculture, MDPI, vol. 15(5), pages 1-18, February.

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