边宽尾墩体型对边墙区域水流水力特性的影响研究

Study on impact of flaring gate pier shape on hydraulic characteristics of flow in sidewall region

本文采用模型实验和数值模拟方法对Y型宽尾墩+阶梯溢流坝+消力池一体化消能进行分析研究,Y型边宽尾墩在满足泄洪消能条件下,侧收缩角设置不佳,会出现水流飞溅出边墙的问题。通过实验结果,比较分析三种不同体型边宽尾墩的整体水流流态、墩后水翅、溢流坝面时均压强、消力池时均压强及流速分布发现,边宽尾墩侧收缩角分别为19.03°、17.07°、19.98°、13.80°和19.98°、7.0°时消力池内水流流态均较好,其消能效果较好。当边宽尾墩侧收缩角为19.98°、7.0°时,水流不飞溅出边墙。

This paper presents an experimental study and numerical simulations of the flow in an energy dissipator of Y-shape flaring gate pier, stepped spillway, and stilling basin. The flaring gate pier, if with an unreasonable lateral contraction in flood releasing conditions, often produces water splashes that jump over the sidewalls. Three different shapes of sidewall flaring pier were experimentally tested and compared for their overall flow pattern, water wings behind pier, overflow surface pressure, pressure on stilling, and velocity distribution. Results reveal that the flow patterns and energy dissipation in the stilling basin are good when the flaring piers take contraction angles of 19.03°and 17.07°, 19.98° and 13.80°, or 19.98° and 7.0°. And water splashing over the sidewalls can be avoided with the angles of 19.98° and 7.0°.