| Cite this article: | 薛绍鹏,葛茂生,魏福强,等.旋转折射式喷头移动喷洒水量分布计算模型构建与应用[J].灌溉排水学报,0,():-. |
| Xue Shaopeng,Ge Maosheng,Wei Fuqiang,et al.旋转折射式喷头移动喷洒水量分布计算模型构建与应用[J].灌溉排水学报,0,():-. |
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| Modeling and application of rotary refractive sprinkler head mobile spray water distribution calculation model |
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Xue Shaopeng1,2, Ge Maosheng1,2, Wei Fuqiang1,2, Zhang Qianwen1,2, Zhang Tingning1,2
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1.Northwest A&2.F University
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| Abstract: |
| Abstract: 【Objective】Constructing a one-time fitted mobile spraying water distribution calculation model, exploring the hydraulic characteristics of mobile spraying with rotating refracting nozzles and optimising the unit's operating parameters and configuration. 【Method】This paper adopts the sprinkler intensity equivalent stretching method, and constructs a mobile sprinkler water distribution calculation model based on primary orthogonal polynomial fitting,. Apply the model to the R3000, S3000, O3000 rotary refractive sprinkler head simulation calculations, analysis of the working pressure (50~150 kPa), moving speed (20~45 m/h) and the combination of spacing (1.2 m~8.4 m) on the three types of sprinkler mobile sprinkler water distribution and uniformity,【Results】the results show that: (1) The mobile precipitation depth with the distance from the sprinkler head (1) The mobile precipitation depth of R3000, S3000 and O3000 sprinkler head decreases with the increase in distance from the nozzle, mobile spraying uniformity than fixed spraying increased by 11.17%, 10.72% and 2.36% respectively. (2) With the increase in working pressure, the effective spraying radius of R3000, S3000 and O3000 sprinkler heads gradually increased, and the uniformity of irrigation showed a trend of increasing and then decreasing. The average depth of precipitation and uniformity of each sprinkler head with the increase in moving speed gradually reduced, but the average change in uniformity is small, only 0.59%,1.38%and 0.99%. With the increasing of the combination distance, the average precipitation depth decreases and the decline rate gradually decreases, and the uniformity is fluctuating and decreasing trend. (3) Considering the influence of both working pressure and combination spacing, the highest uniformity of spraying was achieved under the conditions of R3000 at 150 kPa~3.6 m, S3000 at 150 kPa~2.4 m and O3000 at 130 kPa~3.6 m.【Conclusion】The equivalent stretching method reduces the number of fits in the model construction process and improves the calculation accuracy; increasing the working pressure and reducing the combination spacing helps to improve the uniformity of spraying by moving the nozzle. |
| Key words: Low pressure sprinkler; water quantity distribution; uniformity; mobile spraying; mathematical model; combination spacing |
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