| 引用本文: | 任乃望,胡明月,付博阳,等.动态水压对坡地喷灌水滴直径分布的影响[J].灌溉排水学报,2019,38(10):72-82. |
| ,et al.动态水压对坡地喷灌水滴直径分布的影响[J].灌溉排水学报,2019,38(10):72-82. |
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| 摘要: |
| 【目的】探索坡地上采用动态水压喷灌时水滴直径分布规律。【方法】以雨鸟R5000型喷头为研究对象，应用视频雨滴谱仪对坡地喷灌水滴直径沿程分布进行了测量，分别分析了动态水压和恒压模式下水滴直径沿射程变化、水滴直径频率分布及落地水滴速度、水滴角度与水滴直径之间的关系，并比较2种压力模式下上述关系的异同。【结果】①动态水压和恒压喷灌下水滴直径存在差异，随距喷头的距离增加，二者差异逐渐增大；而随坡度增大，二者差异变小。②在喷头附近和射程末端处小水滴数量占绝大多数。③水滴平均速度与水滴直径呈对数增长，压力模式和坡度对速度与直径之间的关系不显著。④垂直落地的水滴频率大小与距喷头距离关系密切，且垂直落地水滴直径较小，压力模式对角度与直径关系的影响不明显。【结论】在坡地上，分别采用动态水压和恒压喷灌时，二者水滴直径分布规律相似，动态水压不会对坡地喷灌造成更不利影响，可应用于生产实践。 |
| 关键词: 坡地喷灌； 动态水压； 水滴直径 |
| 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 |
