Influence of the downwash airflow in Hexacopter Drone on the spray distribution pattern of boom sprayer
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Abstract
The spray characteristics of drone sprayers are significantly influenced by the downwash airflow produced by Drone multi-rotors. The present study aimed to study the influence of downwash airflow and the operational parameters of Drone sprayer, viz., flight height, travel speed, rotor configuration, payload and wind velocity on the spray distribution pattern for boom sprayer attachment to Drone. The boom type sprayer consisted of four numbers of flat fan nozzles placed at three different spacing viz., 30, 45 and 60 cm between each nozzle. The spray distribution pattern of the Hexacopter Drone was studied at three different operating pressures, viz., 3.0, 4.0 and 5.0 kg cm-2. A spray patternator of 5 m x 5 m was developed per the Bureau of Indian Standards (BIS) standard to study the spray uniformity of volume distribution pattern. The best spray uniformity was found as 0.37 % CV value at 60 cm nozzle spacing and 4 kg cm-2 operating pressure. The optimised parameters viz., 60 cm of nozzle spacing and 4 kg cm-2 operating pressure, the influence of downwash airflow on the spray volume distribution of hexacopter Drone with boom spray attachment were studied. The Drone hovered at three different heights, viz., 1.0, 2.0 and 3.0 m from the top of the patternator and spray operating pressure was maintained at 4 kg cm-2. It was observed that less volume of spray was collected at the middle portion when the Unmanned Aerial Vehicle (UAV) was hovered at 1.0 m height due to the direct impact of downwash airflow of rotors. The uniform spray volume distribution pattern was observed when Drone hovered from 1.0 m to 3.0 m height. A round vertex pattern of spray pattern was generated with boom type nozzles configuration due to the direct impact of downwash airflow of rotors. This study will be helpful in the configuration of nozzles attached to the drone sprayers, optimization of spray operational parameters, and revealing spray volume distribution pattern.
Article Details
Article Details
Boom spray, Downwash airflow, Flat fan nozzles, Hover height, Rotor propeller, Spray distribution, UAV Sprayer
Berner, B., &Chojnacki, J. (2017). Zastosowaniebezzałogowychstatkówpowietrznych do opryskiwaniauprawrolniczych. Technika Rolnicza Ogrodnicza Leśna, (2).
Butts, T. R., Luck, J. D., Fritz, B. K., Hoffmann, W. C., & Kruger, G. R. (2019). Evaluation of spray pattern uniformity using three unique analyses as impacted by nozzle, pressure, and pulse‐width modulation duty cycle. Pest Management Science, 75(7), 1875-1886.
Chapple, A. C., R. A. Downer and F. R. Hall (1993). Effects of Spray Adjuvants on Swath Patterns and Drop Spectra for a Flat-Fan Nozzle. Crop Prot. 12(8):579- 590.
Chojnacki, J. & Pachuta, A. (2021). Impact of the parameters of spraying with a small unmanned aerial vehicle on the distribution of liquid on young cherry trees. Agriculture, 11(11), 1094.
Coombes, M., Newton, S., Knowles, J. & Garmory, A. (2022). The influence of rotor downwash on spray distribution under a quadrotor unmanned aerial system. Computers and Electronics in Agriculture, 196, 106807.
Giles, D.K. & Billing, R.C. (2015). Deployment and Performance of a UAV for Crop Spraying Chemical Engineering Transactions, 44: 307 –312.
Huang, Y.B. et al. (2009). Development of a spray system for an unmanned aerial vehicle platform. Applied Engineering in Agriculture, 25(6): 803 –809
Khoshnam, F. (2022). Analysis of nozzle spray distribution for different nozzle height and pressure. Agricultural Engineering International: CIGR Journal, 24(1).
Lan, Y., Qian, S., Chen, S., Zhao, Y., Deng, X., Wang, G., ... &Qiu, X. (2021). Influence of the Downwash Wind Field of Plant Protection UAV on Droplet Deposition Distribution Characteristics at Different Flight Heights. Agronomy, 11(12), 2399.
Li J Y, Lan Y B, Shi Y Y. Research progress on airflow characteristics and field pesticide application system of rotary-wing UAV . Transactions of the CSAE, 2018, 34(12): 104–118. doi: 10.11975/j.issn.1002-6819.201 8.12.013. http://www.tcsae.org.
Luck, J. D., Schaardt, W. A., Sharda, A. & Forney, S. H. (2016). Development and evaluation of an automated spray patternator using digital liquid level sensors. Applied Engineering in Agriculture, 32(1), 47-52.
Pachuta, A., Berner, B. & Chojnacki, J. (2018). Evaluation of liquid transverse distribution under a twin spray jet installed on a drone. In Proceedings of the 25th International PhD Students Conference (MendelNet 2018), Brno, Czech Republic (pp. 7-8).
Padhee, D., Verma, S., Rajwade, S. S., Ekka, H., Chandniha, S. K. & Tiwari, S. K. (2019). Evaluating the effect of nozzle type, nozzle height and operating pressure on spraying performance using a horizontal spray patternator. Journal of Pharmacognosy and Phytochemistry, 8(4), 2137-2141.
Qing, T., Ruirui, Z., Liping, C., Min, X., Tongchuan, Y. & Bin, Z. (2017). Droplets movement and deposition of an eight-rotor agricultural UAV in downwash flow field. International Journal of Agricultural and Biological Engineering, 10(3), 47-56.
Sehsah, E. M. E. (2016). Vertical patternator for evaluation of the hydraulic sprayers. Misr Journal of Agricultural Engineering, 33(4), 1239-1254.
Shridar, B. (1997). Investigation on the effect of system machine and operational parameters in relation to development of Orchard sprayer.Unpublished Ph.D Thesis- Dept. of Farm Machinery, Tamil Nadu Agricultural University, Coimbatore.
Singh S K, S. Singh, V. Sharda and N Singh (2006). Performance of different nozzles for tractor mounted sprayers. J. Res. Punjab Agric Univ., 43 (1): 44-49.
Subr, A., Milanowski, M., Parafiniuk, S. & Sawa, J. (2017). Testing the uniformity of spray distribution under different application parameters.
Tajuddin, A. (1995). Investigation on the effect of operational and atomizer parameters on the performance of battery powered spraying system. Unpublished Ph.D Thesis- Dept. of Farm Machinery, Tamil Nadu Agricultural University, Coimbatore.
Xue, X.,Lan, Y., Sun, Z., Chang, C. & Hoffmann, W. C. (2016). Develop an unmanned aerial vehicle based automatic aerial spraying system. Computers and Electronics in Agriculture, 128: 58 –66
Yang S. (2014). Spray droplet deposition and distribution inside crop canopy and control efficiency applied by unmanned aerial vehicle. Master dissertation. Beijing: Chinese Academy of Agricultural Sciences, 1–44.
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