| 引用本文: | 刘鸿涛,牛炎,于明舟,等.翼柱型量水槽水力特性分析与对比[J].灌溉排水学报,,():-. |
| LIU-Hongtao,NIU Yan,YU-Mingzhou,et al.翼柱型量水槽水力特性分析与对比[J].灌溉排水学报,,():-. |
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| 摘要: |
| 【目的】为探究翼柱型量水槽在自由出流和淹没出流时的量水性能。【方法】试验观测10种流量条件下,量水槽进口到出口13个测流断面的水位,对自由出流和淹没出流两种工况下的水面线、佛汝德数、测流精度等水力参数进行分析与对比。【结果】分析结果表明,翼柱型量水槽过槽流量与上游水深具有良好的相关关系,拟合得到了自由出流和淹没出流状态下的流量公式,将实测流量与计算流量进行比较,误差均满足规范要求；分析了不同流量工况下佛汝德数的变化规律。U形渠道翼柱型量水槽具有较大的自由出流范围,临界淹没度可达0.890。拟合的淹没出流流量公式最大淹没度高达0.958,同时满足灌溉渠道系统量水规范[17]小于5%的误差要求。【结论】经试验确定临界流断面位于距进口约为量水槽4倍翼高处。翼柱型量水槽可满足小比降既成渠道的测流要求,进一步解决了量水槽流量公式在淹没出流情况下测流误差较大的问题。 |
| 关键词: 翼柱型量水槽;流量公式;测流精度;淹没出流;佛汝德数;水力性能;对比试验 |
| DOI： |
| 分类号:S274.4 |
| 基金项目:吉林省科技厅重点科技攻关项目(20170204008SF)；吉林省科技厅重点科技研发项目(专项支持)(20180201036SF) |
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| Analysis and Comparison of Hydraulic Characteristics of Wing Pillar-Shaped Measuring Flume |
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LIU-Hongtao1, NIU Yan1, YU-Mingzhou1, HAN Yu2,3
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1.College of Water and Environmental Engineering, Changchun Institute of Technology,;2.College of Water Resources &3.Civil Engineering, China Agricultural University
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| Abstract: |
| 【Objective】In order to explore water performance of wing pillar-shaped measuring flume in free outflow and submerged outflow. 【Method】The water levels of 13 flow measuring sections from the inlet to the outlet of the measuring flume under 10 kinds of flow were observed through experiments, and the hydraulic parameters such as water surface line, Froude number and flow measurement accuracy under two conditions of free outflow and submerged outflow were analyzed and compared. 【Result】The analysis results show that there was a good correlation between the flow rate of the airfoil-type measuring flume and the upstream water depth. The flow formula of the flume under free and submerged outflow conditions was obtained by fitting. The errors between the measured flow rate and the calculated flow rate meeted the requirements of the Specifications for water measurement of irrigation canal system (GB/T 21303-2017). The variation law of Froude number under different flow conditions was analyzed, and the position of the critical water depth was determined. 【Conclusion】The critical flow section is located at 4 times the height of the wing of the measuring flume from the inlet. The airfoil measuring flume has a large free outflow range, and the critical submergence degree can reach 0.890. This study can provide reference for the development and application of water measuring facilities in irrigation districts in northern China. |
| Key words: wing pillar-shaped measuring flume;flow formula;accuracy of flow measurement; Fr;hydraulic performance;contrast test |
