水力发电学报2017，Vol.36Issue(8)：58-64,7.DOI:10.11660/slfdxb.20170807
凸底明渠流速分布试验研究
Experimental study on velocity distribution in open channel with a bottom sill
摘要
Abstract
A laboratory experiment,along with theoretical analysis,was conducted to study the vertical profiles of flow velocity on the center plane of an open channel with a bottom sill,and from the measurements a parabolic formula was established for the profiles at the crest of sills with different shapes.Results show a linear relationship of the parabola coefficient versus the slope of the upstream sill face.And,the peak of the velocity profiles moves closer to the channel bottom as this sill slope increases,with its lowest position at a bottom distance as small as 41％ of the flow depth,i.e.far away from the water surface.The peak value of velocity is increased with the increasing flow rate,but the ratio of peak to mean velocity approaches to constant.Calculations of this formula agree with the measurements and its accuracy is higher for lower velocity,showing it effective in description of the actual velocity over the sills.关键词
流速垂向分布/最大流速/凸底/坡度/明渠Key words
vertical distribution of velocity/maximum velocity/bottom sill/slope/open channel分类
建筑与水利引用本文复制引用
孙志林,李霖生,董海洋,许丹..凸底明渠流速分布试验研究[J].水力发电学报,2017,36(8):58-64,7.基金项目
国家基金重大研究计划项目(91647209) （91647209）
中交第二航务工程局项目 （）
