弯曲度对弯道水流结构影响的三维数值模拟研究  

Influence of Curvature on Curved Channel Flow Structure by 3D Numerical Simulation

作　　者：于洋 艾丛芳[1] 金生[1] YU Yang, AI Congfang, JIN Sheng(College of Hydraulic Engineering, Faculty of Infrastruc.ture Engineering, Dalian University of Techcology, Dalian, Liaoning 116024, China)

机构地区：[1]大连理工大学建设工程学部水利工程学院,辽宁大连116024

出　　处：《水利与建筑工程学报》2018年第3期218-223,共6页Journal of Water Resources and Architectural Engineering

摘　　要：为了研究天然河道中不同弯曲度(弯道转角)河段的水流结构和演化规律,对同一曲率半径、同一水深、同一渠宽以及同一边界条件下的弯曲度分别为30°、60°、90°、120°、150°、180°的6种明渠弯道(弯道断面为矩形)进行弯道水流三维数值模拟。研究结果表明:在相同边界条件下,弯道弯曲度越大,弯道中弯顶处的水面横比降也随之增大;在靠近凹岸侧,横纵向流速随弯曲度增大而减小;在靠近凸岸侧,横纵向流速随弯曲度增大而增大;随着弯道弯曲度的增大,横向环流强度也不断增强,横向环流涡心位置也逐渐向凸岸侧移动。In order to research the structure and evolution of the flow in different meandering sections of natural river,the curves of the same radius of curvature,the same water depth,the same width and the same boundary conditions are respectively 30°,60°,90°,120°,150°,180°of 6 kinds of open channel bend（ the bend section is rectangular） for three-dimensional numerical simulation of water flow. The results show that： under the same boundary conditions,the greater the bending curve,the larger the transverse slope; close to the concave side of the shore,horizontal and vertical velocity decreases with the increase degree of curvature; convex near the shore side,with a flow rate of horizontal and vertical curvature increases; the curve with increasing degree of curvature,the transverse strength is growing circulation,circulation transverse vortex center position is gradually moved toward the convex side of the shore.

关 键 词：弯道弯曲度 数值模拟 水流结构 横向环流 

分 类 号：TV131.4[水利工程—水力学及河流动力学]