Design and performance test of a novel UAV air-assisted electrostatic centrifugal spraying system
Keywords:
UAV spraying, droplet drift, centrifugal sprayer, air-assisted spraying, electrostatic sprayingAbstract
In order to improve the deposition and uniformity of the pesticide sprayed by the agricultural spraying drone, this study designed a novel spraying system, combining air-assisted spraying system with electrostatic technology. First, an air-assisted electrostatic centrifugal spray system was designed for agricultural spraying drones, including a shell, a diversion shell, and an electrostatic ring. Then, experiments were conducted to optimize the setting of the main parameters that affect the charge-to-mass ratio, and outdoor spraying experiments were carried out on the spraying effect of the air-assisted electrostatic centrifugal spray system. The results showed the optimum parameters were that the centrifugal rotation speed was 10 000 r/min, the spray pressure was 0.3 MPa, the fan rotation speed was 14 000 r/min, and the electrostatic generator voltage was 9 kV; The optimum charge-to-mass ratio of the spray system was 2.59 mC/kg. The average deposition density of droplets on the collecting platform was 366.1 particles/cm2 on the upper layer, 345.1 particles/cm2 on the middle layer, and 322.5 particles/cm2 on the lower layer. Compared to the results of uncharged droplets on the upper, middle, and lower layers, the average deposition density was increased by 34.9%, 30.4%, and 30.2%, respectively, and the uniformity of the distribution of the droplets at different collection points was better. Keywords: UAV spraying, droplet drift, centrifugal sprayer, air-assisted spraying, electrostatic spraying DOI: 10.25165/j.ijabe.20221505.6891 Citation: Hu H M, Kaizu Y, Huang J J, Furuhashi K, Zhang H D, Xiao X, et al. Design and performance test of a novel UAV air-assisted electrostatic centrifugal spraying system. Int J Agric & Biol Eng, 2022; 15(5): 34–40.References
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[2] Liu X, Zhang W, Fu H B, Fu X M, Qi L Q. Distribution regularity of downwash airflow under rotors of agricultural UAV for plant protection. Int J Agric & Biol Eng, 2021; 14(3): 46–57.
[3] Wang G B, Han Y X, Li X, Andaloro J, Chen P C, Hoffmann W C, et al. Field evaluation of spray drift and environmental impact using an agricultural unmanned aerial vehicle (UAV) sprayer. Science of the Total Environment, 2020; 737: 139793. doi: 10.1016/j.scitotenv.2020.139793.
[4] Chen S D, Lan Y B, Zhou Z Y, Deng X L, Wang J. Research advances of the drift reducing technologies in application of agricultural aviation spraying. Int J Agric & Biol Eng, 2021; 14(5): 1–10.
[5] Law S E. Electrostatic pesticide spraying: concepts and practice. IEEE Transactions on Industry Applications, 1983; 19(2): 160–168.
[6] Ru Y, Zhou H P, Shu C R. Deposition evaluation of aerial electrostatic spraying system assembled in fixed-wing. Applied Engineering in Agriculture, 2014; 30(5): 751–757.
[7] Hao Z Y, Li X Z, Meng C, Yang W, Li M Z. Adaptive spraying decision system for plant protection unmanned aerial vehicle based on reinforcement learning. Int J Agric & Biol Eng, 2022; 15(4): 16–26.
[8] Khoshnevis A, Tsai S S H, Esmaeilzadeh E. Electric field induced
sheeting and breakup of dielectric liquid jets. Physics of Fluids, 2014; 26(1): 197–219.
[9] Ru Y, Jin L, Jia Z C, Bao R, Qian X D. Design and experiment on electrostatic spraying system for unmanned aerial vehicle. Transactions of the CSAE, 2015; 31(8): 42–47. (in Chinese)
[10] Lan Y B, Chen S D. Current status and trends of plant protection UAV and its spraying technology in China. International Journal of Precision Agricultural Aviation, 2018; 1(1): 1–9.
[11] Patel M K, Praveen B, Sahoo H K, Sahoo H K, Patel B, Kumar A, et al. An advance air-induced air-assisted electrostatic nozzle with enhanced performance. Computers and Electronics in Agriculture, 2017; 135: 280–288.
[12] Patel M K, Sahoo H K, Nayak M K, Kumar A, Kumar A. Electrostatic nozzle: New trends in agricultural pesticides spraying. National Conference on Emerging Fields in Engineering and Sciences (EFES-2015), 2015; pp.6–11.
[13] Law S E, Bowen S. Charging liquid spray by electrostatic induction. Transactions of the ASAE, 1966; 9(4): 501–506.
[14] Law S E, Thompson S A, Balachandran W. Electroclamping forces for controlling bulk particulate flow: charge relaxation effects. Journal of Electrostatics, 1996; 37(1-2): 79–93.
[15] Ru Y, Zhou H P, Jia Z C, Wu X W, Fan Q N. Design and application of electrostatic spraying system. Journal of Nanjing Forestry University (Natural Sciences Edition), 2011; 35(1): 91–94. (in Chinese)
[16] Fritz B K, Hoffmann W C, Martin D E, Thomson S J. Aerial application methods for increasing spray deposition on wheat heads. Applied Engineering in Agriculture, 2007; 23(6): 709–715.
[17] Inculet I I, Fischer J K. Electrostatic aerial spraying. IEEE Transactions on Industry Applications, 1989; 25(3): 558–562.
[18] Zhang Y L, Lan Y B, Bradley K, Xue X Y. Development of aerial electrostatic spraying systems in the United States and applications in China. Transactions of the CSAE, 2016; 32(10): 1–7. (in Chinese)
[19] Lan Y B, Zhang H Y, Wen S, Li S H. Analysis and experiment on atomization characteristics and spray deposition of electrostatic nozzle.
Transactions of the CSAM, 2018; 49(4): 130–139. (in Chinese)
[20] Maski D, Durairaj D. Effects of charging voltage, application speed, target height, and orientation upon charged spray deposition on leaf abaxial and adaxial surfaces. Crop Protection, 2010; 29(2): 134–141.
[21] Maski D, Durairaj D. Effects of electrode voltage, liquid flow rate, and liquid properties on spray chargeability of an air-assisted electrostatic-induction spray-charging system. Journal of Electrostatics, 2010; 68(2): 152–158.
[22] Zhang H X, Ru Y. Experimental study on rotor airflow electrostatic atomization device. Journal of Chinese Agricultural Mechanization, 2016; 37(12): 57–62. (in Chinese)
[23] Liu D J, Gong Y, Wang G, Zhang X, Chen X. Development of centrifugal atomization technique in the field of plant protection machinery. Plant Diseases & Pests, 2017; 8(3): 39–42. (in Chinese)
[24] Liu J, Yu Q, Guo Q. Experimental investigation of liquid disintegration by rotary cups. Chemical Engineering Science, 2012; 73: 44–50.
[25] Craig I P, Hewitt A, Terry H. Rotary atomiser design requirements for optimum pesticide application efficiency. Crop Protection, 2014; 66: 34–39.
[26] Derksen R C, Zhu H, Ozkan H E, Hammond R B, Dorrance A E, Spongberg A L. Determining the influence of spray quality, nozzle type, spray volume, and air-assisted application strategies on deposition of pesticides in soybean canopy. Transactions of the ASABE, 2008; 51(5): 1529–1537.
[27] Bayat A, Bozdogan N Y. An air-assisted spinning disc nozzle and its performance on spray deposition and reduction of drift potential. Crop Protection, 2005; 24(11): 951–960.
[28] Lavers A. Pesticide application methods. Crop Protection, 1983; 2(1): 122–123.
[29] Zhou H Y, Chen H. Space distribution of electrical field generated by a uniformly charged ring. College Physics, 2004; 9: 32–34. (in Chinese)
[30] He Y J, Zhao B B, Yu Y C. Effect, comparison and analysis of pesticide electrostatic spraying and traditional spraying. Bulgarian Chemical Communications, 2016; 48(Special Issue D): 340–344.
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Published
2022-11-01
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Hu, H., Kaizu, Y., Huang, J., Furuhashi, K., Zhang, H., Xiao, X., … Imou, K. (2022). Design and performance test of a novel UAV air-assisted electrostatic centrifugal spraying system. International Journal of Agricultural and Biological Engineering, 15(5), 34–40. Retrieved from https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/6891
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