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| DOI：10.13522/j.cnki.ggps.2023044 |
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| Construction and Application of Water Distribution Model for Rotary Refractive Sprinkler Spray Head Mobile System |
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XUE Shaopeng, GE Maosheng, WEI Fuqiang, ZHANG Qianwen, ZHANG Tingning
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1. College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, China;
2. Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas,
Ministry of Education, Northwest A＆F University, Yangling 712100, China
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| Abstract: |
| 【Objective】Refractive sprinkler spray head mobile irrigation is a widely used irrigation system. In this paper, we proposed a model to calculate its water distribution and hydraulic characteristics for helping optimize its operating parameters and configuration. 【Method】We used the sprinkler intensity equivalent stretching method and constructed a mobile sprinkler water distribution model based on the primary orthogonal polynomial fitting. The model was then applied to the R3000, S3000 and O3000 rotary refractive sprinkler head systems to analyze their water distribution under working pressure ranging from 50 to 150 kPa, moving speed from 20 to 45 m/h, sprinkler spacing from 1.2 to 8.4 m.【Result】① The water depth of all three systems decreased with the increase in sprinkler distance. Compared with a fixed system, the three mobile systems increased spraying uniformity by 2.36% to 11.17%. ② With the increase in working pressure, the effective spraying radius of the R3000, S3000 and O3000 systems gradually increased, while their spraying uniformity increasing first followed by a fall. The average water depth and distribution uniformity of the mobile systems decreased with the increase in moving speed, albeit the change was small ranging from 0.59% to 1.38% for the three systems. With the increase in sprinkler distance, the average water depth and the spraying uniformity decreased in a fluctuating way. ③ Considering the influence of working pressure and sprinkler spacing, the R3000, S3000 and O3000 gave the highest spraying uniformity when the working pressure/distance was 150 kPa/3.6 m, 150 kPa/2.4 m and 130 kPa/3.6 m, respectively.【Conclusion】The equivalent stretching method reduces the number of fittings in model construction and improves modelling accuracy. Increasing working pressure or reducing sprinkler spacing can improve spraying uniformity. |
| Key words: low pressure sprinkler; water quantity distribution; uniformity; mobile spraying; mathematical model; combination spacing |
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