不同底坡矩形明渠跌水流量测算模型试验结果  

Experimental results of flow calculation model with free overfall in rectangular open channel with different slopes

作　　者：乔丹[1] 谌霞 马鹏 陈小攀 QIAO Dan;SHEN Xia;MA Peng;CHEN Xiaopan(Yangling Vocational Technical College,Yangling 712100,Shaanxi China;Northwest A&F University,College of Water Resources and Architectural Engineering,Yangling 712100,Shaanxi China;China Metallurgical Group Northwest Geotechnical Engineering Co.,Ltd.,Xi’an 710061,China;Henan Tianchi Pumped Storage Power Co.,Ltd.,Nanyang 473000,Henan China)

机构地区：[1]杨凌职业技术学院,陕西杨凌712100 [2]西北农林科技大学水利与建筑工程学院,陕西杨凌712100 [3]中冶地集团西北岩土工程有限公司,陕西西安710061 [4]河南天池抽水蓄能有限公司,河南南阳473000

出　　处：《粘接》2023年第5期156-159,共4页Adhesion

基　　金：杨凌职业技术学院2021年院内基金项目(项目编号:ZK21-21)。

摘　　要：对跌水测流的研究,主要集中在坡度和糙率对EDR(跌坎水深与临界水深之比)值的影响以及流量计算公式等方面。但也存在一些问题,比如缺乏针对负坡和陡坡渠道跌水的研究等。通过模型试验和数值模拟相结合的方法对不同坡度的矩形明渠自由跌水的EDR值以及流量公式进行了研究。结果表明:在明渠糙率n=0.009时,EDR值随着明渠底坡S的增加而减小,并给出了EDR与S及明渠单宽流量q之间的经验公式;EDR值随来流弗劳德数Fr0的增加而呈指数规律减小;通过理论推导给出了EDR与跌坎断面水流弗劳德数Fre之间的关系方程,并利用试验数据和数值计算结果对此关系进行了验证。At present,the study of flow measurement with free overfall is mainly concentrated on the effect of the slope and roughness on the EDR value and the calculation formula of the flow.But there are still some problems,such as lacking the researches on free overfall in the negative slope and steep channels.The model test and numeri⁃cal simulation were appllied to study the EDR value and the flow formulas of free overfall in rectangular open chan⁃nels with different slopes.The results show that with the open channel roughness n=0.009,EDR decreases with the increase of the channel bottom slope S.The empirical formula between EDR and S and open channel unit discharge q is given.EDR decreases exponentially with increasing inflow Froude number.The relationship between EDR and Froude number at the drop is obtained by theoretical derivation,which is verified by the experimental data and nu⁃merical simulation results.

关 键 词：矩形明渠 自由跌水 测流 EDR值 模型试验 

分 类 号：TV131[水利工程—水力学及河流动力学]