竖井进流水平旋转内消能泄洪洞流场数值模拟

Numerical Simulation of Level Swirling Flow of Inner Energy Dissipation Discharge Tunnel with Shaft Inlet

应用雷诺应力模型,模拟了竖井进流水平旋转内消能泄洪洞空腔环流的水力特性。数值模拟与试验结果比较表明,雷诺应力模型模拟水平旋流泄洪洞的水力特性是可行的,泄洪洞底部压强沿程呈减小变化规律并与实测值一致;轴向流速沿径向呈峰值靠近壁面的抛物线分布,切向流速呈强迫涡和自由涡的组合涡分布,自由涡占大部分区域,轴、切向流速模拟值与实测流速值均符合得较好。并计算和分析了空腔环流的压强等值线、湍动能、湍动耗散率、旋流夹角等的沿程变化,揭示了竖井进流水平旋转内消能泄洪洞空腔环流的一些特有的水力特性。

The paper simulated the hydraulic behaviors of level swirling flow field of inner energy dissipation discharge tunnel with shaft inlet by Renolds stress model.The comparison of numerical simulation with experiment results indicates that using Renolds stress model to simulate the hydraulic behaviors of level swirling flow discharge tunnel is feasible and that the reducing change law of the pressure along the whole way is found to be in agreement with the real measured values.Axial flow velocity showed the parabola distribution along the radius with maximum near the wall;tangent flow velocity appears to be the combination swirling distribution of the enforced swirling flow with free swirling flow,the free swirling flow occupies most of regions.The simulated valves of axial and tangent flow velocities are found to be in agreement with those of real measured flow velocity.Also,the pressure isoline,eddy kinetic energy,eddy dissipation rate and swirling flow inclined angle of cavity swirling flow are calculated and analyzed in their variations,whereby indicating the special hydraulic behaviors of level swirling flow of inner energy dissipation discharge tunnel with shaft inlet.