水利学报2025，Vol.56Issue(2)：253-265,13.DOI:10.13243/j.cnki.slxb.20240515
末级渠道测控闸门自由出流流量模型试验研究
Experimental study on free discharge flow model of measurement-control sluice gate at the outlets of terminal irrigation channels
摘要
Abstract
Currently,the lack of flow measurement equipment or the low precision of existing devices at the outlets of terminal agricultural irrigation channels results in significant errors in obtaining outlet flow rates,making it diffi-cult to achieve intelligent water distribution tasks in canal systems.Therefore,a set of measurement-control gate e-quipment that can accurately measure the outlet flow of the final channel is developed.To achieve accurate monito-ring of the flow through the gate structure,this paper analyzes the hydraulic characteristics of the measurement-control gate and identifies the flow pattern at different openings(e)of the gate.Then,based on the Buckingham theorem and the least square method,the flow measurement model of the gate structure is established.Finally,the accuracy of the model is analyzed and evaluated.The results show that when the relative opening of the measure-ment-control gate is relatively high,the flow through the gate is weir flow,and vice versa,it is orifice flow.The critical relative opening(e/H)c of the critical relative opening of the two flow patterns is 1.033.The average relative error of the discharge calculation model constructed for different gate openings is 4.7％,which is 26.3％more accu-rate than the flow measurement equation for rectangular thin-plate weirs.The error of the orifice flow model is less than 2.9％.When e/Hc＞0.14,the flow is classified as a large orifice flow with a discharge coefficient of 0.7,oth-erwise,it is a small orifice flow with a discharge coefficient of 0.846.The research results can provide a reference for the accuracy improvement of the intelligent gate flow monitoring technology of the irrigation channel.关键词
测控闸门/流量系数/量纲分析/精度评价/末级渠道量水Key words
measurement-control sluice gate/discharge coefficient/dimensional analysis/precision evaluation/terminal irrigation channel flow measurement分类
建筑与水利引用本文复制引用
刘恬恬,吴文勇,胡雅琪,李子明..末级渠道测控闸门自由出流流量模型试验研究[J].水利学报,2025,56(2):253-265,13.基金项目
国家重点研发计划课题项目(2022YFD1900804) （2022YFD1900804）
