Research Status, Methods and Prospects of Air-Assisted Spray Technology

Wei, Zhiming; Li, Rui; Xue, Xinyu; Sun, Yitian; Zhang, Songchao; Li, Qinglong; Chang, Chun; Zhang, Zhi Hong; Sun, Yen; Dou, Qingqing

doi:10.3390/agronomy13051407

Cited by 4 publications

(1 citation statement)

References 66 publications

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“…Technological advancements, such as airflow-assisted spraying [12,13], electrostatic spraying [14,15], boom spraying [16], and contour spraying [17], have been implemented to improve droplet penetration in agricultural production. Traditional boom sprayers, prevalent in field crops, rely on adjustments to spray pressure, flow rate, and nozzle types to enhance penetration, which may also impact spray outcomes [18].…”

Section: Introductionmentioning

confidence: 99%

Study on the Improvement of Droplet Penetration Effect by Nozzle Tilt Angle under the Influence of Orthogonal Side Wind

Sun,

Hu,

Huang

et al. 2024

Sensors

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This study investigates the impact of varying side wind velocities and nozzle inclination angles on droplet penetration during plant protection spraying operations, focusing on citrus trees. Experiments were conducted across four wind speed levels (0, 1, 2, 3 m/s) perpendicular to the nozzle direction and seven nozzle inclination levels (0°, 8°, 15°, 23°, 30°, 38°, 45°) to evaluate droplet distribution under different spraying parameters. A baseline condition with 0 m/s wind speed and a 0° nozzle angle served as the control. Utilizing Computational Fluid Dynamics (CFD) and regression analysis techniques in conjunction with field trials, the droplet penetration was analyzed. Results indicate that at constant wind speeds, adjusting the nozzle inclination angle against the direction of the side wind can significantly enhance droplet deposition in the canopy, with a 23° inclination providing the optimal increase in deposition volume, averaging a change of +16.705 μL/cm2. Multivariate nonlinear regression analysis revealed that both wind speed and nozzle inclination angle significantly affect the droplet penetration ratio, demonstrating a correlation between these factors, with wind speed exerting a greater impact than nozzle angle. Increasing the nozzle inclination angle at higher wind speeds improves the penetration ratio, with the optimal parameters being a 23° angle and 3 m/s wind speed, showing a 12.6% improvement over the control. The model fitted for the impact of nozzle angle and wind speed on droplet penetration was validated through field experiments, identifying optimal angles for enhancing penetration at wind speeds of 1, 2, and 3 m/s as 8°, 17°, and 25°, respectively. This research provides insights for improving droplet penetration techniques in plant protection operations.

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Section: Introductionmentioning

confidence: 99%

Study on the Improvement of Droplet Penetration Effect by Nozzle Tilt Angle under the Influence of Orthogonal Side Wind

Sun,

Hu,

Huang

et al. 2024

Sensors

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Design and experimental assessment of a field‐spraying system with nozzles employing reciprocating up‐and‐down movements

Sun

2023

Pest Management Science

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BackgroundA dense rice‐planting pattern is currently used. For an ordinary boom sprayer, it is still difficult for the droplets to penetrate the dense rice canopy even if an auxiliary airflow is used, especially in the middle and late growth stages. The deposits of droplets at the bottom of the rice plants were typically small. In this study, a spraying system was designed with nozzles creating reciprocating movements into the middle and bottom of the rice canopy. An air pump provided the power to push the nozzles up and down. A time relay and a solenoid valve were used to control the cycle and stroke of the reciprocating movement. At different growth stages of rice, comparative tests were conducted between the air‐assisted spraying pattern (without reciprocating movement of nozzles) and the reciprocating movement spraying pattern (without auxiliary airflow).ResultsThe results showed that for the reciprocating movement spraying pattern, the droplet number densities in the middle and bottom of the rice in the late growth stages increased from 78/cm2 to 124/cm2 and from 19/cm2 to 121/cm2, respectively, and the coverage rates increased from 13.34 % to 24.26 % and from 3.61 % to 21.21 %, respectively. The droplet depositions increased from 0.603 mg/cm2 to 1.139 mg/cm2 and from 0.095 mg/cm2 to 1.001 mg/cm2, respectively.ConclusionsThis spraying pattern can increase droplet deposits at the middle and bottom of the crop and improve uniformity.This article is protected by copyright. All rights reserved.

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Spray performance of flexible shield canopy opener and rotor wind integrated boom‐sprayer application in soybean: effects on droplet deposition distribution

Yu,

Cui,

Cui

et al. 2024

Pest Management Science

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BACKGROUNDCanopy density is high during mid to late soybean growth due to dense planting to improve yield, which seriously affects the control of pests and diseases. The dilemmas of difficult droplet penetration, non‐uniform deposition, and droplet drift in field spraying remain challenges to precise control of droplet distribution. This paper proposed a novel spraying application mode combined Flexible Shield Canopy Opener (FSCO) with rotary wind. The design of the key components of the new boom spraying machine are described. The effects of the comparative spraying modes on spray deposition and droplet drift in field validation test were studied to explore the feasibility of the novel spraying application.RESULTSThe study found that droplet coverage inside the soybean canopy was significantly affected by spraying mode, rotor wind speed, and opener depth. The spraying operation that used the FSCO and rotor wind integrated mode was optimal for droplet uniformity on the adaxial and abaxial surfaces of the canopy leaves, with droplet uniformity indices of 0.966 and 0.934, respectively. At rotor wind speed of 6 m/s and opener depth of 15 cm, the soybean canopy droplet coverage uniformity effect achieved the highest composite score of 0.937. The spraying mode used in this study improved droplet coverage uniformity by 82.30% and droplet anti‐drift performance improved by 99.73% compared to the conventional boom spraying mode.CONCLUSIONThe study shows validity of the spraying mode combined FSCO with rotary wind to open dense canopy and improved droplet deposition uniformity in canopy and anti‐drift performance.This article is protected by copyright. All rights reserved.

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Research Status, Methods and Prospects of Air-Assisted Spray Technology

Cited by 4 publications

References 66 publications

Study on the Improvement of Droplet Penetration Effect by Nozzle Tilt Angle under the Influence of Orthogonal Side Wind

Study on the Improvement of Droplet Penetration Effect by Nozzle Tilt Angle under the Influence of Orthogonal Side Wind

Design and experimental assessment of a field‐spraying system with nozzles employing reciprocating up‐and‐down movements

Spray performance of flexible shield canopy opener and rotor wind integrated boom‐sprayer application in soybean: effects on droplet deposition distribution

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