Effects of nozzle types, adjuvants and environmental conditions on spray drift potential of unmanned aerial vehicles in a wind tunnel

ZENG Aijun; WANG Changling; SONG Jianli; WANG Zhichong; HUANG Mingyi; HE Xiongkui; Andreas HERBST

doi:10.16801/j.issn.1008-7303.2020.0067

Volume 22 Issue 2

Apr. 2020

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Chinese Journal of Pesticide Science > 2020 > 22(2): 315-323. > DOI: 10.16801/j.issn.1008-7303.2020.0067

ZENG Aijun, WANG Changling, SONG Jianli, WANG Zhichong, HUANG Mingyi, HE Xiongkui, Andreas HERBST. Effects of nozzle types, adjuvants and environmental conditions on spray drift potential of unmanned aerial vehicles in a wind tunnel[J]. Chinese Journal of Pesticide Science, 2020, 22(2): 315-323. DOI: 10.16801/j.issn.1008-7303.2020.0067

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Effects of nozzle types, adjuvants and environmental conditions on spray drift potential of unmanned aerial vehicles in a wind tunnel

1.
College of Science, China Agricultural University, Beijing 100193, China
2.
Institute for Chemical Application Technology of JKI, Messeweg 11/12 D-38104 Braunschweig, Germany

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Received Date: November 19, 2019
Accepted Date: March 09, 2020
Available Online: March 20, 2020

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Abstract

In order to investigate and reduce spray drift during the use of plant protection unmanned aerial vehicles (UAV), a spray unit consisting of a single rotor and a nozzle was simulated under the controlled wind tunnel conditions (wind speed 5 m/s, spray pressure 0.3 MPa and rotor speed 2 300 r/min). The effects of 11 kinds of nozzles and 4 different adjuvants on droplet drift were investigated. The drift potential index (DIX) and drift potential reduction percentage (DPRP) were also evaluated and compared. The results show that under the condition of 20℃/RH 80%, the drift distribution of different nozzle types in vertical plane and horizontal distance showed a regular change trend. Compared with the reference nozzle F110-03, the order of the drift potential of nozzles from large to small was TR80-0067 > ST110-0067 > XR110-01 > ST110-015 > TR80-01 > ST110-02 > XR110-03 > F110-03 > IDK series. The effect of IDK120-01and IDK120-015 was similar and they were the best ones. Under the wind tunnel condition of 30℃/RH 40% and wind speed of 5 m/s, compared to the control group without adjuvants, the mean drift reduction rates of spray nozzle XR 110-01 with adjuvant of 0.5% Silwet DRS-60, 1.0% "Maifei" (MF) and 1.0% Y-20079 were 43.3%, 15.6% and 5.2%, respectively. The selection of drift reducing adjuvants needs to consider the type of adjuvants and their effects. At the wind tunnel conditions of 20℃/RH 40%, 20℃/RH 80%, 30℃/RH 40% and 30℃/RH 60%, the spray nozzle XR110-01 added with 1.0% MF adjuvant was beneficial to the reduction of airborn drift. Especially, under high temperature and low humidity conditions, it had better drift reduction effect. This study has provided reference and guidance for nozzles selection, adjuvants selection and the field application of UAV for plant protection, and also data basis for the further study of the drift reduction technology of nozzle and adjuvants.
- unmanned aerial vehicle,
- nozzle,
- adjuvant,
- wind tunnel,
- spray drift,
- drift potential index,
- drift potential reduction percentage,
- droplet size

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Effects of nozzle types, adjuvants and environmental conditions on spray drift potential of unmanned aerial vehicles in a wind tunnel

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