反弧阶梯溢洪道水力特性  

Hydraulic characteristics of a reverse arc-stepped spillway

作　　者：张伟[1] 李书芳[1] 王景旭 ZHANG Wei;LI Shufang;WANG Jingxu(School of Water Conservancy and Hydroelectric Power,Hebei University of Engineering,Handan 056038,China)

机构地区：[1]河北工程大学水利水电学院,河北邯郸056038

出　　处：《水利水电科技进展》2022年第3期75-80,共6页Advances in Science and Technology of Water Resources

基　　金：河北省自然科学基金(E2019402102)。

摘　　要：为提高大单宽流量阶梯溢洪道消能率和增加掺气,提出一种新型反弧阶梯溢洪道,即将传统直角阶梯的水平面改为反弧面。通过物理模型试验,对反弧形阶梯的流态、掺气发生位置和消能率进行了研究。结果表明,在试验条件范围内,反弧阶梯流态可分为跌落流、挑射流、过渡流、滑行流4种,在单个阶梯长度和高度相同时,反弧阶梯掺气发生位置是直角阶梯的0.5~0.8倍,反弧阶梯消能率比直角阶梯最大增加约9%。In order to improve the energy dissipation rate and increase the aeration,a new type of reverse arc-stepped spillway was proposed,in which the horizontal plane of the traditional right-angle step was changed into a reverse arc surface.The flow pattern,aeration location and energy dissipation rate of the reverse arc step were studied by physical model tests.The results show that in the range of test conditions,the flow patterns of the reverse arc step can be divided into four kinds,which are nappe flow,ejection flow,transition flow and skimming flow.When the length and height of a single step are the same,the aeration position of the reverse arc step is 0.5 to 0.8 times of that for a right-angle step,and the energy dissipation rate of reverse arc step is about 9%higher than that of a right-angle step.

关 键 词：反弧阶梯 阶梯溢洪道 流态 消能率 掺气 

分 类 号：TV651.1[水利工程—水利水电工程]