Research progress in rotor airflow model of plant protection UAV and droplet motion mechanism

被引：0
|
作者：
Zhang H. [1 ]
Lan Y. [2 ,4 ]
Wen S. [3 ,4 ]
Xu T. [1 ]
Yu F. [1 ]
机构：
[1] College of Information and Electrical Engineering, Shenyang Agricultural University, Shenyang
[2] College of Electronic Engineering, South China Agricultural University, Guangzhou
[3] College of Engineering, South China Agricultural University, Guangzhou
[4] National Center for International Collaboration Research on Precision Agricultural Aviation Pesticides Spraying Technology, Guangzhou
来源：
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | 2020年 / 36卷 / 22期
关键词：
Drift; Droplet impact model; Evaporation; Rotor wind field; Spray; UAV;
D O I：
10.11975/j.issn.1002-6819.2020.22.001
中图分类号：
学科分类号：
摘要：
The usage of aircrafts to perform crop spraying is becoming increasingly prevalent, owing to their high speed and efficiency in operations, compared with the manual crop spraying representing an expensive and time-consuming labor activity in agricultural production. Agriculture drones or unmanned aerial vehicles (UAVs) have attracted increasing attention, due to their small size, easy handling, and without a runway, particularly suitable for small farmlands in Asia. Currently, the agriculture drones have been widely used in modern precision agriculture. The UAVs has produced rapidly in East Asia for their excellent application efficiency and ability to protect densely planted crops, especially in China. A survey that conducted by the National Agricultural Technology Extension Center of Ministry of Agriculture and Rural Affairs showed that there are more than 50 000 plant protection drones, and 311 333.3 hm2 cultivated field spraying in 2019. Nowadays, the spray technology applied on UAVs has developed into the main plant protection approaches. However, the key theory associated with the spraying technology of UAVs remains unknown. Three key theories mainly are: 1) The characters of downwash flow structure and its effect on droplet movement during aerial spraying, as well as plant canopy. Unique complex feature in the downwash flow structure of UAVs influences the law of droplet dispersion, the velocity and direction of droplet movement, as well as the canopy structure and morphology of target plant, particularly on the incidence angle, the impact diameter, and impact velocity of droplet, during the interaction process between droplet and plant. There was a significant influence on the droplet deposition and drift. 2) The flight parameters of UAVs, spray parameters in a spray system applied on UAVs, and physical quality have posed an important effect on the droplet deposition and drift. The flight parameters UAVs also influence the downwash flow structure and droplet transport distance. The unreasonable parameters of UAVs flight can cause some deposition, resulting the drift potential of droplet. The formulation and spray parameters in the UAVs can also influence the droplet size, dispersion, and transport velocity, indicating the interaction process between the droplet and downwash flow of UAVs, as well as the law of droplet deposition and drift. 3) The interaction mechanism between the droplet and plant. There was a significant influence on the retention and drift of final droplet, and the biology efficacy of pesticide, indicating a critical part of plant protection. An investigation on the key theories can contribute to improve the performance of spray technology using UAVs. This review covers the current status related to three key theories, presenting an idea to build the downwash flow model of UAVs, a droplet dispersion model, a droplet evaporation model, the interaction model between downwash flow and droplet, between downwash flow and plant canopy, and between droplet and plant canopy, and a spray retention model applied on UAVs basing on these daughter model. The parameters of flight and spray were optimized by the spray retention model, indicating an excellent spray performance. © 2020, Editorial Department of the Transactions of the Chinese Society of Agricultural Engineering. All right reserved.
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页码：1 / 12
页数：11
相关论文
共 86 条
  • [31] Wang Changling, Song Jianli, He Xiongkui, Et al., Effect of flight parameters on distribution characteristics of pesticide spraying droplets deposition of plant-protection unmanned aerial vehicle, Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 33, 23, pp. 109-116, (2017)
  • [32] Qiu Baijing, Wang Liwei, Cai Donglin, Et al., Effects of flight altitude and speed of unmanned helicopter on spray deposition uniform, Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 29, 24, pp. 25-32, (2013)
  • [33] Zhang Songchao, Xue Xinyu, Qin Weicai, Et al., Simulation and experimental verification of aerial spraying drift on N-3 unmanned spraying helicopter, Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 31, 3, pp. 87-93, (2015)
  • [34] Wang Juan, Lan Yubin, Zhang Huihui, Et al., Drift and deposition of pesticide applied by UAV on pineapple plants under different meteorological conditions, Int J Agric & Biol Eng, 6, 11, pp. 5-13, (2018)
  • [35] Hu Lian, Zhou Zhiyan, Luo Xiwen, Et al., Development and experiment of a wireless wind speed sensor network measurement system for unmanned helicopter, Transactions of the Chinese Society for Agricultural Machinery, 45, 5, pp. 221-226, (2014)
  • [36] Wang Pei, Hu Lian, Zhou Zhiyan, Et al., Wind field measurement for supplementary pollination in hybrid rice breeding using unmanned gasoline engine single-rotor helicopter, Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 29, 3, pp. 54-61, (2013)
  • [37] Li Jiyu, Zhou Zhiyan, Lan Yubin, Et al., Distribution of canopy wind field produced by rotor unmanned aerial vehicle pollination operation, Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 31, 3, pp. 77-86, (2015)
  • [38] Li Jiyu, Zhou Zhiyan, Hu Lian, Et al., Optimization of operation parameters for supplementary pollination in hybrid rice breeding using round multi-axis multi-rotor electric unmanned helicopter, Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 30, 11, pp. 1-9, (2014)
  • [39] 30, 2, pp. 13-19
  • [40] Baker G R, Barker S J, Bofah K K, Et al., Laser anemometer measurements of trailing vortices in water, Journal of Fluid Mechanics, 65, 2, pp. 325-336, (1974)
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