Assessment of Different Parameters Influencing the Quality of Spray Distribution on Orchard Sprayers

Wegener, Jens Karl; Pelzer, Tanja; Ahrens, Katrin

doi:10.1007/s10343-019-00447-9

Cited by 3 publications

(3 citation statements)

References 2 publications

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“…To ensure the reliability of the simulation and balance the simulation accuracy and efficiency, the following assumptions were established for the solution conditions based on previous relevant studies: (1) Assuming that the discrete phase (droplets) is relatively thin (i.e., the volume fraction of particles is less than 12%), then the interaction between particles and the volume fraction of particles can be ignored on the continuous phase. (2) Studies have demonstrated that when the tractor's forward speed is low with small fluctuations (i.e., it is much smaller than the movement speed of fog droplets), the forward…”

Section: Simulation Test Conditions and Assumptionsmentioning

confidence: 99%

“…Fruit trees under the orchard planting mode in South Xinjiang have strong tree potential, a large canopy and wide line spaces. Many droplets cannot fall on leaves during plant protection based on the sprayer to the arbour and fruit trees, thus resulting in low pesticide utilisation [2]. The spraying effect of sprayers on fruit trees with strong tree potentials and wide line spaces is still unsatisfying under the current planting mode in orchards in South Xinjiang.…”

Section: Introductionmentioning

confidence: 99%

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Performance Analysis and Testing of a Multi-Duct Orchard Sprayer

Wang

et al. 2023

Agronomy

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A multi-duct orchard sprayer is designed in this paper to address the problem of low droplet coverage during plant protection in walnut orchards in South Xinjiang, China. This spray comprises a base frame, a pesticide tank, an air delivery system, a copying base frame and a drive system. Effects of the sprayer structure on the flow field were simulated using computational fluid dynamics. Operation parameters were optimised using the response surface analysis and validated using a field test. The results demonstrated that five jet tubes in the simulation design could fulfil the design requirements of GB/T 32250.3-2022. The upper, middle and lower droplet coverages were 74.92%, 90.01% and 69.9%, respectively, when the sprayer’s advancing speed, the angle of jet tubes and the nozzle diameter were 0.53 m/s, 70.27° and 0.81 mm, respectively. The machine can effectively enhance the spraying efficiency and droplet coverage of each canopy during plant protection operations in the new walnut orchards of South Xinjiang, China, and provide references for designing and optimising fruit tree spraying machinery.

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Section: Simulation Test Conditions and Assumptionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance Analysis and Testing of a Multi-Duct Orchard Sprayer

Wang

et al. 2023

Agronomy

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“…The conventional method for testing spray distribution in orchards was carried out based on the amount of droplet deposition, mainly using a vertical deposition distribution test bench [3]. However, this test method requires multiple tests at various distances to obtain a two-dimensional spatial distribution, and obtaining a three-dimensional spatial distribution is challenging.…”

Section: Introductionmentioning

confidence: 99%

Visualization of Lidar-Based 3D Droplet Distribution Detection for Air-Assisted Spraying

et al. 2023

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Air-assisted spraying is a commonly used spraying method for orchard plant protection operations. However, its spraying parameters have complex effects on droplet distribution. The lack of large-scale 3D droplet density distribution measurement methods of equipment has limited the optimization of spraying parameters. Therefore, there is a need to develop a method that can quickly obtain 3D droplet distribution. In this study, a 2D LiDAR was used to quickly scan moving droplets in the air, and a test method that can obtain the visualization of 3D droplet distribution was constructed by using the traveling mode of the machine perpendicular to the scanning plane. The 3D droplet distribution at different positions of the nozzle installed in the air-assisted system was tested at different fan rotation speeds, and the methods for signal processing, point cloud noise reduction, and point cloud division for 2D LiDAR were developed. The results showed that the LiDAR-based method for detecting 3D droplet distribution is feasible, fast, and environmentally friendly.

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Influence of Spray Control Parameters on the Performance of an Air-Blast Sprayer

Yang

Hou

et al. 2022

Agriculture

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Orchard plant protection machinery in China still has a low application efficiency. Air-blast sprayers represent the primary development direction of pesticide applications in orchards. The spray control parameters have to be matched to the tree canopy status to achieve precise results. In this study, a vertical patternator was used to determine the accuracy of spraying fruit trees. The influences of three control parameters (blower speed, spray angle, and spray distance) on the spray performance of the air-blast sprayer were analyzed, and the volume of the spray was measured in collection plates at different heights. The quantitative relationship between the overall collection volume and the critical height collection volume was obtained for different parameter values, and the combined effects of any two control parameters on the collection performance and the position of the optimum collection area were obtained. The regression model describing the relationship between the collection volume in the critical height range and the three factors was established, and the main effects of the control parameters were determined. The results showed that if one parameter remained constant, the correlation between the other two parameters was non-significant. The collection volume in the critical height range increased initially and then decreased as the spray distance increased. The maximum collection volume was obtained at a spray distance of 1.762 m. The regression model can be used to obtain the optimum values of the parameters.

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Assessment of Different Parameters Influencing the Quality of Spray Distribution on Orchard Sprayers

Cited by 3 publications

References 2 publications

Performance Analysis and Testing of a Multi-Duct Orchard Sprayer

Performance Analysis and Testing of a Multi-Duct Orchard Sprayer

Visualization of Lidar-Based 3D Droplet Distribution Detection for Air-Assisted Spraying

Influence of Spray Control Parameters on the Performance of an Air-Blast Sprayer

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