Next Article in Journal
Phenotypic and DNA Marker-Assisted Characterization of Russian Potato Cultivars for Resistance to Potato Cyst Nematodes
Previous Article in Journal
Characterization of Beekeepers and Their Activities in Seven European Countries
Article

Influence of the Downwash Wind Field of Plant Protection UAV on Droplet Deposition Distribution Characteristics at Different Flight Heights

1
College of Electronic Engineering, South China Agricultural University, Guangzhou 510642, China
2
Department of Biological and Agricultural Engineering, Texas A&M University, College Station, TX 77845, USA
3
College of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255049, China
4
Information Technology and Engineering, Guangzhou College of Commerce, Guangzhou 511363, China
5
Mechanical and Electrical Engineering College, Hainan University, Haikou 570228, China
*
Author to whom correspondence should be addressed.
Academic Editor: Francesc Xavier Prenafeta Boldú
Agronomy 2021, 11(12), 2399; https://doi.org/10.3390/agronomy11122399
Received: 8 October 2021 / Revised: 22 November 2021 / Accepted: 23 November 2021 / Published: 25 November 2021
(This article belongs to the Section Agricultural Engineering)
The aerial spraying of pesticides by plant protection unmanned aerial vehicles (UAV) is a process in which the spray droplet deposition on target sites occurs under the influence of the downwash wind field. The downwash wind field is the most important factor affecting droplet deposition distribution characteristics in an aerial spray. To understand the mechanism of the downwash wind field, spray tests were conducted at different flight heights by using a DJI UAV, and the downwash wind field in the three-dimensional direction (X-directional wind, Y-crosswind, and Z-vertical wind) was measured by using a wind speed measurement system for UAV. Combined with the droplet deposition of aerial spray, the distribution characteristics of the downwash wind field and the influence of the downwash wind field on droplet deposition were studied. The results showed that it had obvious differences in the distribution of the downwash wind field for UAV at different flight heights. As the flight height increases, the downwash wind field in X-direction and Z-direction showed a strong to weak trend, while the downwash wind field in Y-direction showed an opposite trend. In addition, it was found that the downwash wind field in Y-direction and Z-direction both have a significant influence on droplet deposition. With the increase of flight height, the change of the downwash wind field led to a gradual decrease in droplet deposition in the effective spray area, and droplets deposited more uniformly. For the DJI T16 plant protection UAV in this test, the optimal flight height was 2.0 m, and the downwash wind field had a better improvement effect on droplet deposition. Therefore, in order to make full use of the downwash wind field of UAV, the appropriate flight height should be selected to improve droplet deposition of liquid pesticide and achieve a better control effect for crop disease and pests when UAV is used for aerial spray operations in the field. This study revealed the influence mechanism of the downwash wind field on droplet deposition of aerial spray, and proposed appropriate operation parameters from the perspective of practical operation. It was expected to provide data support for improving the operation quality of aerial spraying and the formulation of field operation specifications. View Full-Text
Keywords: plant protection UAV; aerial spray; downwash wind field; droplet deposition plant protection UAV; aerial spray; downwash wind field; droplet deposition
Show Figures

Figure 1

MDPI and ACS Style

Lan, Y.; Qian, S.; Chen, S.; Zhao, Y.; Deng, X.; Wang, G.; Zang, Y.; Wang, J.; Qiu, X. Influence of the Downwash Wind Field of Plant Protection UAV on Droplet Deposition Distribution Characteristics at Different Flight Heights. Agronomy 2021, 11, 2399. https://doi.org/10.3390/agronomy11122399

AMA Style

Lan Y, Qian S, Chen S, Zhao Y, Deng X, Wang G, Zang Y, Wang J, Qiu X. Influence of the Downwash Wind Field of Plant Protection UAV on Droplet Deposition Distribution Characteristics at Different Flight Heights. Agronomy. 2021; 11(12):2399. https://doi.org/10.3390/agronomy11122399

Chicago/Turabian Style

Lan, Yubin, Shicheng Qian, Shengde Chen, Yingjie Zhao, Xiaoling Deng, Guobin Wang, Yu Zang, Juan Wang, and Xingyan Qiu. 2021. "Influence of the Downwash Wind Field of Plant Protection UAV on Droplet Deposition Distribution Characteristics at Different Flight Heights" Agronomy 11, no. 12: 2399. https://doi.org/10.3390/agronomy11122399

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop