水力发电学报2014，Vol.33Issue(3)：203-209,215,8.
宽尾墩体型对宽尾墩+阶梯溢流坝+消力池消能方式中阶梯掺气空腔长度及负压影响研究
Study of impacts on aerated cavity length and negative pressure by Y-shape flaring gate pier combined with stepped spillway in energy dissipator
摘要
Abstract
The energy dissipater of flaring gate pier combined with stepped spillway is widely used in China.This paper presents a numerical simulation study of aerated cavity length and negative pressure that vary with the contraction ratio of symmetrical flaring gate pier.A RNG k-ε turbulence model and a water vapor two-phase VOF model were applied to the simulation,with a geometry reconstruction scheme for free surface generation by iterative solution,a velocity-pressure coupling method using PISO algorithm,and an unsteady flow approach for steady flow iteration.Three contraction ratios of 0.4,0.7 and 0.445 were simulated and the computational domain covered the section from the upstream reservoir to the downstream stilling basin.The calculated cavity length has been verified by comparison with experimental measurements and its relative errors are below 10％,showing good reliability of the simulation.Results also show that as the contraction ratio decreases,the cavity length is increased and the lowest negative pressure become higher,but the extent of negative pressure expands on the steps.关键词
工程水力学/三维数值模拟/RNG七-ε紊流模型/掺气空腔Key words
engineering hydraulics/ 3-D numerical simulation/ RNG k-εturbulence model/ aerated cavity分类
建筑与水利引用本文复制引用
后小霞,杨具瑞,甄建树..宽尾墩体型对宽尾墩+阶梯溢流坝+消力池消能方式中阶梯掺气空腔长度及负压影响研究[J].水力发电学报,2014,33(3):203-209,215,8.基金项目
水利部公益项目(20110025) （20110025）
