Open Journal Systems

Distribution of water droplets of non-circular sprinkler nozzles

Jialing Liu, Jixiang Wan, Hao Li, Yue Jiang

Article ID: 2057
Vol 4, Issue 1, 2023

VIEWS - 37 (Abstract)

Abstract

Objective: The research aimed to study the distribution law of the diameter, velocity, and kinetic energy of water droplets in special-shaped nozzles. Method: A video raindrop spectrometer was used to conduct an indoor windless water droplet distribution test on the PY15 rocker-arm sprinkler under 5 working pressures of 100 kPa, 150 kPa, 200 kPa, 250 kPa, and 300 kPa. Result: The range of the equal-flow nozzle is: circle > rhombus > ellipse; the shape coefficient of the special-shaped nozzle decreases with the increase of the outlet diameter and increases with the increase of the aspect ratio; the diameter of the water droplet of the rhombus nozzle increases in the radial direction. Conclusion: The larger the shape coefficient, the smaller the diameter of the water droplet at the end under the same working pressure. The larger the diameter of the outlet, the longer the range, and the greater the increase in the velocity of the water droplets with the diameter. The larger the aspect ratio is, the closer the range is, and the larger the average diameter and velocity of the droplets are. With the increase in droplet diameter, the droplet velocity of the elliptical nozzle increases the least. The hitting kinetic energy and its growth range of water droplets per unit volume at the same position decrease with the increase in pressure. The droplet diameter and kinetic energy are exponential and linear functions along the radial direction, and the droplet velocity and diameter are logarithmic. The fitting coefficients of the three droplet distribution prediction models are all above 0.9, which can be used to simulate the relationship between the shape coefficient, outlet diameter, aspect ratio, and droplet distribution characteristics of the shaped nozzle.

Keywords

rocker nozzle; shaped nozzle; video raindrop spectrometer; water droplet diameter distribution; droplet kinetic energy distribution

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References

1. Bao Y, Liu J, Liu X, et al. Experimental study on effects of pressure on water distribution model of low-pressure sprinkler (Chinese). Journal of Drainage and Irrigation Machinery Engineering 2016; 34(1): 81–85.

2. Li J, Xu Z. Research on water-saving irrigation in the development of facility horticulture: Review of “water-saving irrigation technology” (Chinese). Journal of Irrigation and Drainage 2020; 39(1): 146.

3. Zhu X, Shi Y, Hu G, et al. Dynamic simulation and test of water distribution of fluidic sprinkler (Chinese). Journal of Irrigation and Drainage 2020; 39(4): 74–83.

4. Yuan S, Li H, Wang X. Status, problems, trends and suggestions for water-saving irrigation equipment in China (Chinese). Journal of Drainage and Irrigation Machinery Engineering 2015; 33(1): 78–92.

5. Wu P, Zhu D, Lv H, et al. Introduction to Irrigation Hydraulics (Chinese). Chinese Science Publishing & Media Ltd.; 2012.

6. Tu Q, Li H, Wang X, et al. Comparison and selection of small-scale irrigation machines with multiple sprinklers based on grey relational analysis (Chinese). Journal of Jiangsu University (Natural Science Edition) 2014; 35(6): 656–662.

7. Xu H, Gong S, Jia R, Liu X. Study on droplet size distribution of ZY sprinkler head (Chinese). Journal of Hydraulic Engineering 2010; 41(12): 1416–1422.

8. Sánchez Burillo G, Delirhasannia R, Playán E, et al. Initial drop velocity in a fixed spray plate sprinkler. Journal of Irrigation and Drainage Engineering 2013; 139(7): 521–531.

9. Gong X, Zhu D, Zhang L, et al. Drop size distribution of fixed spray-plate sprinklers with two-dimensional video disdrometer (Chinese). Transactions of the Chinese Society for Agricultural Machinery 2014; 45(8): 128–133+148.

10. Lorenzini G. Water droplet dynamics and evaporation in an irrigation spray. Transactions of the ASABE 2006; 49(2): 545–549.

11. Ouazaa S, Burguete J, Paniagua MP, et al. Simulating water distribution patterns for fixed spray plate sprinkler using the ballistic theory. Spanish Journal of Agricultural Research 2014; 12(3): 850. doi: 10.5424/sjar/2014123-5507

12. Zhu X, Liu X, Liu J, et al. Droplet kinetic energy distribution regulation of complete fluidic sprinkler (Chinese). Transactions of the Chinese Society of Agricultural Engineering 2015; 31(15): 26–31.

13. Chen C, Yuan S, Li H, Wang C. Effect of non-circle nozzle on hydraulic performance of impact variable-rate sprinkler (Chinese). Transactions of the Chinese Society for Agricultural Machinery 2011; 42(12): 111–115.

14. Li D, Lu X, Zhao X. Experimental study on low pressure jet characteristic of the non-circle jet nozzle (Chinese). Light Industry Machinery 2006; 24(3): 18–20.

15. Zhou X, Li H, Jiang Y. Study on water distribution uniformity of non-circular nozzles at low pressure (Chinese). Journal of Drainage and Irrigation Machinery Engineering 2017; 35(5): 448–453.

16. Jiang Y, Li H, Hua L, et al. Experimental study on jet breakup morphologies and jet characteristic parameters of non-circular nozzles under low-intermediate pressures. Applied Engineering in Agriculture 2019; 35(4): 617–632. doi: 10.13031/aea.13291

17. Wu P, Zhu D, Lv H, Zhang L. Hydraulics problems in farmland irrigation (Chinese). Journal of Drainage and Irrigation Machinery Engineering 2012; 30(6): 726–732.

DOI: https://doi.org/10.54517/ama.v4i1.2057
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