Droplet Size Distribution Characteristics of Aerial Nozzles by Bell206L4 Helicopter under Medium and Low Airflow Velocity Wind Tunnel Conditions and Field Verification Test

Yao, Weixiang; Lan, Yubin; Hoffmann, W. Clint; Li, Jiyu; Guo, Shuang; Zhang, Huihui; Wang, Juan

doi:10.3390/app10062179

Cited by 7 publications

(8 citation statements)

References 22 publications

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“…Thus, in terms of agricultural aviation, China lags far behind the United States, Russia, Australia, Canada, Brazil, Japan, and South Korea. In the sparsely populated areas of the United States, manned fixed-wing aircraft is the most popular form of agricultural aviation [4][5][6][7] . The development mode of agricultural aviation in Russia, Australia, Canada, and Brazil is the same as that in the United States, which is characterized by the use of manned fixed-wing aircraft and rotary-wing helicopters [8] .…”

Section: Introduction mentioning

confidence: 99%

Effects of plant protection UAV-based spraying on the vertical distribution of droplet deposition on Japonica rice plants in Northeast China

Cao

et al. 2021

International Journal of Agricultural and Biological Engineering

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In order to study the regularity of the vertical distribution of droplet deposition on rice plants during pesticide spraying operated by a low-flying multi-rotor plant protection unmanned aviation vehicle (UAV), water-sensitive spray cards were placed on the leaves at the top, in the middle, and at the bottom of rice plants to acquire data on droplet deposition. In this study, a suspension containing tricylazole and hexaconazole was used in the spraying. The water-sensitive spray cards were analyzed by the droplet deposition processing software iDAS to obtain the vertical distribution of the droplets sprayed by the plant protection UAV. The results showed that 1) significant variation was found in the coverage of the droplets in different vertical positions of the rice plants. Within the effective spray width, the best coverage of the droplets was found in the area just below the rotors, whereas the coverage of areas farther away from the rotors was poor. For the different vertical positions of the rice plants, the overall droplet coverage was 58.38% at the top, 33.55% in the middle, and 11.34% at the bottom of the plants; 2) for all vertical positions, the average size of the droplets ranged between 110 μm and 140 μm, which was suitable for the control of plant diseases and insect pests. The highest droplet density was found at the top of the plants, and the distribution of the droplet density was similar in the middle and at the bottom of the rice plants; 3) the diffusion ratio at the top of the rice plants (0.84) was better than that in the middle (0.57) and at the bottom (0.37). The overall relative span could meet the requirements for the actual application. Except for the position in the middle of the plants, the relative span for the other positions of the plants was over 0.67, which is the standard value. This study demonstrated the distribution regularity of droplet deposition along with the vertical direction of rice plants during UAV-based spraying, which is of guiding significance for the use of UAVs in plant protection, the improvement of chemical utilization efficiency, and the reduction of pesticide and fertilizer pollution.

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Section: Introduction mentioning

confidence: 99%

Effects of plant protection UAV-based spraying on the vertical distribution of droplet deposition on Japonica rice plants in Northeast China

Cao

et al. 2021

International Journal of Agricultural and Biological Engineering

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“…The influence of flight parameters, particularly flight path, also was noteworthy. There are differences in the deposition directly below and on either side of a flight path due to the rotor airflow and nozzle arrangement 19,37 . In addition, it is clear that the droplet deposition of different treatments also showed significant differences, especially for T1, which was significantly higher than that of T2 and T3.…”

Section: Resultsmentioning

confidence: 99%

“…A detailed description of the wind tunnel test method was given previously by Yao et al 37 . The tested nozzles were those used in the spray application trials and five nozzles were randomly selected for each type.…”

Section: Methodsmentioning

confidence: 99%

“…There are differences in the deposition directly below and on either side of a flight path due to the rotor airflow and nozzle arrangement. 19,37 In addition, it is clear that the droplet deposition of different treatments also showed significant differences, especially for T1, which was significantly higher than that of T2 and T3. With the same spray rate (15 L ha −1 ) for all treatments, the average This was caused mainly by the type of nozzle used in the spraying operation.…”

Section: Tree Sampling Zonementioning

confidence: 98%

“…A detailed description of the wind tunnel test method was given previously by Yao et al 37 The tested nozzles were those used in the spray application trials and five nozzles were randomly selected for each type. Before the wind tunnel tests, spray flow rate of each nozzle type was measured five times to calculate a mean value.…”

Section: Nozzle Performance Testmentioning

confidence: 99%

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Droplet deposition and pest control efficacy on pine trees from aerial application

Yao

Guo

Wang

et al. 2022

Pest Management Science

Self Cite

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BACKGROUND: Aerial application, a spraying method with aircraft as the application platform, is one of the most important methods of pest control in pine forests. This work aimed to investigate the movement and distribution patterns of droplets and the pest control effectiveness of helicopter spraying on Masson pine (MP) and Korean pine (KP) trees. In particular, three nozzle types (CP02, CP03 and CP04) were evaluated and compared at the same spray volume rate (15 L ha −1 ) in both wind tunnel and field trials.RESULTS: The CP04 nozzle with a larger orifice size showed significantly better deposition and penetration, but the precision of flight operation parameters must be strictly controlled when using this type of nozzle. The majority (≥48%) of the droplets produced by the three nozzle types were concentrated in the range of <200 ∼m, and the spray performance of each nozzle type was more stable in the range 201-300 ∼m. The final pest correction control rate (CR) of MP was in the range 59.24-95.74% and that of KP was 45.41-54.39% by helicopter spraying.CONCLUSION: This study confirmed that it is necessary to select the appropriate nozzle type and ensure accurate flight parameters for aerial application in mountain pine forests. Meanwhile, it also confirms the importance of the timing of operation which can lead to incorrect implementation, resulting in poor control effectiveness.

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Effect of Nozzle Condition and Type in the Spray Quality in Wheat Plants

Subr

Milanowski

Parafiniuk

2022

Lecture Notes in Civil Engineering

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Droplet Size Distribution Characteristics of Aerial Nozzles by Bell206L4 Helicopter under Medium and Low Airflow Velocity Wind Tunnel Conditions and Field Verification Test

Cited by 7 publications

References 22 publications

Effects of plant protection UAV-based spraying on the vertical distribution of droplet deposition on Japonica rice plants in Northeast China

Effects of plant protection UAV-based spraying on the vertical distribution of droplet deposition on Japonica rice plants in Northeast China

Droplet deposition and pest control efficacy on pine trees from aerial application

Effect of Nozzle Condition and Type in the Spray Quality in Wheat Plants

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