水科学进展2009，Vol.20Issue(6)：824-829,6.
大型泄洪洞有压弯道水力特性
Flow characteristics in a circular-section bend of high head spillway tunnel
摘要
Abstract
Large-scale physical model experiments (1∶38) combined with three-dimensional (3D) Reynolds stress question model(RSM) numerical modeling are used in this study to explore the hydraulic characteristics in a circular-section bend of high-head spillway tunnel. The 3D RSM is used to simulate the incoming velocities under different pre-designed bend radius and angle conditions, as well as the pressure and velocity distributions in the bend. The simulations compare well with the experimental data. Both occurrence and development of the secondary circulation in the bend are successfully simulated by RSM. An expression for optimizing the minimum bend pressure is derived. The expression establishes the relation between the bend pressure and velocity, and the pre-designed bend radius and angle conditions. The result of using the expression shows that the bend radius is the premier parameter to be considered when designing a circular-section bend of high-head spillway tunnel.关键词
弯道/泄洪洞/高坝/水力学Key words
bend/spillway tunnel/dams/hydraulics分类
建筑与水利引用本文复制引用
沙海飞,吴时强,周辉..大型泄洪洞有压弯道水力特性[J].水科学进展,2009,20(6):824-829,6.基金项目
国家自然科学基金资助项目(50579084 （）
50909064) （）
