竖井旋流泄洪洞出口体型优化研究

Study on Optimization of Outlet Structure of Vortex Drop Shaft Spillway

为对某竖井旋流泄洪洞出口体型进行优化,提出了一种新型出口形式,通过多组物理模型试验获得了初步的优化设计原则,并结合数值模拟综合验证分析。结果表明,出口结构前端为竖向环状水跃与横向淹没水跃相连的二级掺混消能区域,湍动能大,消能效果显著,大泄量下总体消能率相对提高10%;后部水流流态转化平顺,低速平稳流出;底板压强分布合理,时均值前大后小,均方根值较小且相对减小25.26%,底板安全稳定有保障。

In the process of modifying outlet structure of a vortex drop shaft spillway, a novel outlet shape was proposed. The preliminary optimization principle was obtained through multiple sets of physical model tests, and the numerical simulation was used for comprehensive analysis. The results show that a vertical annular hydraulic jump and a horizontal submerged hydraulic jump are observed in the front of the outlet structure, forming two energy dissipation zones, in which the energy dissipation effect is significant with large turbulent kinetic energy. The total energy dissipation rate under large flood condition is relatively increased by 10%. The end water flows out smoothly at a low speed. The time-averaged pressure of the bottom plate is represented as being the largest in the front and the smallest in the back, and the root mean square value is relatively reduced by 25.26%, indicating that the bottom plate has good stability.