水电站截流三维水流数学模型研究

使用σ坐标变换技术,用连续方程求解水位,动量方程求解流速,在水平方向上使用ADI方法,σ向间距递减分层,建立三维水流数学模型。用研究区段实测流速及水位进行验证,表明模型具有良好的质量守恒性质。以验证后的模型模拟截流时戗堤口门宽度分别为50m和35m时戗堤上下游水位变化、轴线断面流速分布及轴线附近流速的变化规律。结果表明,三维水流计算结果与物理模型的实测结果基本一致,为电站截流的水流数学模型提供了一种新的研究思路。

Research of a 3-D Flow Mathematical Model with Hydropower Plant Closure

The 3-D flow mathematical model is set up by using σ coordinate transformation technique.The model is confirmated by the use of water level and flow velocity in survey region,the results indicate that it has a good mass conservation properties.The model is employed to carry out a numercial simulation of the water level changes between upstream and downstream,the velocity distribution of axis section and its nearby when the closure gap width changes from 50 m to 35 m,the results show that the calculation results of 3-D flow mathematical model than the physical model obserbation of around 10% are too big,the causes were analyzed in this paper,and the conclusion is that the 3-D model is suitable for the river clouser construction of the pubugou hydropower station when the calculation multiplied by 0.95.The results provide a new research method for the hydropower plant closure.