毛家河水电站溢洪道三维数值模拟

Three-dimensional Numerical Simulation of Spillway Flow of Maojiahe Hydropower Station

为寻求毛家河水电站溢洪道较优的泄洪消能形式,以质量守恒及动量守恒为基础,建立了κ-ε湍流模型封闭雷诺方程组,采用VOF方法追踪自由液面,对溢洪道泄流能力、水面线、底板压力及槽身和下游河道的流速进行了三维数值计算,数值计算结果与模型试验结果吻合较好,并根据工程实际情况拟定了多种方案对溢洪道全域及下游河道进行了数值模拟。计算结果表明,设置中隔墙并使左、右泄槽挑流鼻坎错开布置方案,溢洪道槽身段水流流态较好,挑射水流与下游河道水流衔接平顺且对两岸岸坡冲刷较轻,总体效果较好。

For a better form of energy dissipation in spillway of Maojiahe hydropower station, k--Е turbulent model is built based on conservation of mass and momentum. With the method of VOF tracking the free surface, three-dimensional numerical simulation of the release water is conducte. Simulated result is well coincided with the model test. According to engineering practice, a variety of programs are analyzed numerically （such as the simulation of the whole region of the spillway and the cushion pool）. The resuts show that the program of setting up a wall to divide the flip bucket can make the flow pattern of release water better and produce smooth flow articulation between the jet flow and the downstream channel with little bank-slope scour. So, it has good effect on the whole.