基于水气两相流的水布垭电站泄洪雾化有限元分析

泄洪雾化实际上是水气两相流体混合运动的过程。笔者从描述流体运动的质量守恒以及动量守恒方程出发,建立描述泄洪雾化的数学模型,采用有限元法求解模型。求解过程中采取了相应的非线性项求解策略,解决了求解过程中的数值收敛性与稳定性问题。通过与传统的方腔驱动流动算例进行对比,验证了模型的正确性。根据水布垭电站溢洪道及河谷地形地貌建立了三维有限元计算网格,并对其泄洪过程进行了数值模拟,通过与泄洪实测数据对比发现,该数值方法对泄洪雾化过程中的风场、雨场具有较强的预测能力。

Finite element analysis on the flood discharge atomization of Shuibuya Hydropower Station based on water-air two-phase flow

Flood discharge atomization is actually a process of mixed motion of water and air two-phase fluids. Based on the mass and momentum conservation equations, the mathematical model of flood discharge atomization was established and solved by the finite element method. A non-linear solution strategy was adopted, which solved the problems of numerical convergence and stability in the solution process. The correctness of the model was verified by comparing the result with that of the square cavity driven flow case. According to the spillways of the Shuibuya Hydropower Station and the topography of the valley, a three-dimensional finite element calculation grid was established, and the flood discharge process was simulated. The consistency of the calculated data with the actual flood discharge data verifies that the numerical method has good prediction ability for the wind and rain fields in the process of flood discharge atomization.