水利水电技术2017，Vol.48Issue(3)：52-56,5.DOI:10.13928/j.cnki.wrahe.2017.03.010
小宽深比U型弯道环流试验研究
Experimental study on circulation flow of U-shape channel bend with small width-depth ratio
摘要
Abstract
With Doppler velocimeter (ADV),3-D flow velocities on all the point of various vertical locations at the cross-section along the U-shape channel bend with small width-depth ratio are measured,and then the hydraulic characteristics of the location of the main stream line,the vertical distribution of the transverse flow velocity,the structure of circulation flow,the strength of circulation flow,etc.are analyzed according to the measured data.The study result shows that the surface main stream flow and the bottom main stream flow begin to separate from each other after the cross-section of 60°and then form a complicated helical structure.After water flowing into the channel bend,an anticlockwise main circulation flow is created,furthermore,a secondary circulation flow appears at the surface of the concave bank in the direction opposite to the main circulation flow from the cross-section of 75°,while the location with the maximum strength value of the circulation flow occurs at 1/3 of the curvature of the bend.The study result provides an effective reference for the further deep study on the turbulence characteristics and sediment movement of channelbend.关键词
宽深比/横向流速/弯道环流/环流强度/物理模型/佛汝德数/泥沙输移特性Key words
width-depth ratio/transverse velocity/circulation flow of channel bend/strength of circulation flow/physical model/Froude number/characteristics of sediment transport分类
水利科学引用本文复制引用
马淼,李国栋,宁健..小宽深比U型弯道环流试验研究[J].水利水电技术,2017,48(3):52-56,5.基金项目
国家自然科学基金(51579206) （51579206）
陕西省自然科学基础研究计划(2015JM5201) （2015JM5201）
