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| DOI：10.13522/j.cnki.ggps.20190187 |
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| Effect of Pulsating Pressure on Water Droplet Diameter Distribution for Sprinkler Irrigation on Sloping Land |
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REN Naiwang，HU Mingyue， FU Boyang， HUANG Yu， ZHANG Lin
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1.College of Water Resources and Architectural Engineering, Northwest A＆F University, Yangling 712100, China 2.Anhui Survey and Design Institute of Water Conservancy and Hydropower, Hefei 230088, China
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| Abstract: |
| 【Objective】The objective of this paper is to experimentally explore the distribution of water droplet diameter during pulsating water pressure on sloping land.【Method】The Rainbird R5000 sprinkler was selected as the research object, and the distribution of the diameter of the sprinkler irrigation on the slope was measured by two-dimensional video disdrometer. The relationship among drop sizes, drop diameter distribution, drop velocity and drop angle in dynamic water pressure and constant pressure were analyzed, and the similarities and differences of the above two pressure modes were compared.【Result】①There were differences in the drop diameter under the two pressure modes, but they all increased with the increase of the range distance. The difference between the two models decreased as the slope was increased. ②The number of small water droplets from the proximal end of the nozzle and the end of the range was the largest. ③The relationship between average drop velocity and drop diameter met logarithmic function, and the effect of pressure model and slope on the relationship between drop diameter and velocity was not obvious; the frequency of water droplets falling vertically was related to the distance from the nozzle, and the diameter of vertical landing droplets was small. ④The effect of operating pressure model on the relationship between drop diameter and angle was not obvious.【Conclusion】On the sloping land, when pulsating pressure and constant pressure sprinkler were used respectively, the two diameter distribution laws were similar, and the dynamic water pressure will not cause more adverse effects on the sprinkler irrigation on sloping land, which can be applied to production practice. |
| Key words: sprinkler irrigation on sloping land; pulsating pressure; drop diameter |
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