| 引用本文: | 许春芳,高建东,刘恩民.低压灌溉管道多出口流量分配的实验研究[J].灌溉排水学报,,():-. |
| XU Chunfang,GAO Jiandong,LIU Enmin.低压灌溉管道多出口流量分配的实验研究[J].灌溉排水学报,,():-. |
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| 摘要: |
| 【目的】低压管道输水灌溉末级管道控制面积偏大时,往往出现2～3个出水口同时取水的现象,致使管线首部的流量计量无法实现计量到户。【方法】以模拟实验为手段,对多出口分流的流量分配规律进行研究。【结果】第一出口的流量受到它后面出口间距离长度(或综合长度)的影响,后面的出口距离越大则形成的阻力越大,第一出口流量也就越大。二出口分流可以直接应用实验得出的方程计算出流量,误差小于1%；三出口分流的流量分配是将两个间距概化为一个综合长度来表征水流向后输送的阻力大小,并得出第一出口流量分配函数,回归计算验证误差小于5%,精度比二出口分流稍差。【结论】多出口流量分配应从第一出口流量着手,对于只有管路首部计量的多出口出流灌溉计量信息化是一个理想的技术支撑。 |
| 关键词: 管道输水灌溉;多口出流;灌溉计量;信息化 |
| DOI： |
| 分类号:S275 |
| 基金项目:水资源与水电工程科学国家重点实验室开放基金(2016SWG03) |
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| Experimental Study on the Flow Distribution in a Low-Pressure Multi-outlet Irrigation Pipeline System |
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XU Chunfang1, GAO Jiandong2, LIU Enmin3
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1.Lingcheng Bureau of water resources;2.Shangshan Water Development Co., Ltd. of Lingcheng, Dezhou;3.Institute of Geographic Sciences and Natural Resources Research,CAS
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| Abstract: |
| 【Background】Taking water from 2 or 3 outlets at the same time is common, when the final stage of the low-pressure irrigation pipeline system controls a large area. 【Objective】In this case, the head flow of the pipeline cannot be measured to each household. 【Method】A simulation experiment was conducted to investigate the flow distribution in the pipeline with multi-outlets. 【Result】The first outlet flow was affected by the distances (or integrated length) between the following outlets. The larger the distances between the following outlets, the greater flow resistance left behind and the greater the first outlet flow. The flow distribution could be calculated directly using the equation obtained from this experiment in the case of two outlets, and the error was less than 1%. When there were three-outlets, distances between outlets were integrated into one length to characterize the resistance of the backward water flow, and the distribution function of first outlet flow was obtained. The error was less than 5% with regression analysis, and the prediction accuracy was lower than that for two-outlet flow calculations. 【Conclusion】Partitioning multi-outlets flow should start from the first outlet. This study provides an ideal technical support for informatization of multi-outlet outflow irrigation measurements with only monitoring the head flow in the pipeline |
| Key words: Piped water supply irrigation; multiple outflows; irrigation metering; information |
