摘要
水闸下游水流流动扩散特性对下游河床及岸坡冲刷具有重大影响。为研究闸下水流扩散特性的影响因素,采用物理模型试验,分析了不同扩散比、闸门开启高度、弗劳德数及下游水深对水闸下游流态的影响;同时以断面相对最大流速及不均匀系数作为水闸下游扩散特性的衡量指标,得到不同弗劳德数、闸门相对开启高度、扩散比和水闸下游水流扩散特性指标的相关关系。结果表明,扩散比的增大会导致偏折水流的出现并增大偏折程度;而弗劳德数和闸门开启高度的增大则使水流偏折程度减少;断面相对最大流速和断面流速不均匀度均沿程减小,且受扩散比的影响最大。
The flow and diffusion characteristics of the sluice downstream have a significant impact on the scouring of the downstream riverbed and bank slope.In order to study the influencing factors of downstream diffusion characteristics,physical model tests were used to analyze the effects of different diffusion ratios,gate openings,Froude number and downstream water depth on the flow pattern of sluice downstream.Meanwhile,the relative maximum velocity and non-uniformity coefficient of the cross-section were taken as the measurement indicators of the diffusion characteristics of the sluice downstream,and the correlations among different Froude numbers,relative opening of the sluice,diffusion ratio and the indexes were obtained.The results show that the increase of diffusion ratio will lead to the emergence of deflected flow and increase the degree of deflection,while the increase of Froude number and gate opening will reduce the degree of deflection;The relative maximum velocity and the non-uniformity of cross-section flow speed decrease along the course,and are most affected by diffusion ratio.
作者
马广钢
于建忠
傅宗甫
陈月君
MA Guang-gang;YU Jian-zhong;FU Zong-fu;CHEN Yue-jun(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;Jiangsu Taihu Planning and Design Institute of Water Resources Co.,Ltd.,Suzhou 215128,China)
出处
《水电能源科学》
北大核心
2019年第9期83-87,共5页
Water Resources and Power
关键词
闸下水流
扩散特性
扩散比
相对开启高度
弗劳德数
downstream of sluice
expansion characteristics
expansion ratio
relative gate opening
Froude number
作者简介
马广钢(1995-),男,硕士研究生,研究方向为工程水力学,E-mail:1925211721@qq.com;通讯作者:傅宗甫(1966-),男,博士、副教授,研究方向为工程水力学,E-mail:zffu@hhu.edu.cn.
