泄洪排沙洞台阶消能结构设计方案优化研究

OPTIMIZATION STUDY ON DESIGN SCHEME OF STEPPED ENERGY DISSIPATION STRUCTURE OF FLOOD DISCHARGE AND SEDIMENT DISCHARGE TUNNEL

近年来高坝建设迅速发展,对其泄洪消能技术就提出更高的要求。在高速水流下,传统的泄洪排沙洞设计已不能满足泄洪洞功能需求。通过对洛宁抽水蓄能电站水库泄洪洞出口挑流消能工况进行水力学模型试验,发现将泄洪泂挑坎高度和角度设置为下降后,水舌不再受下部水体的影响,散射翻转能量的效果良好,可以提高性能。撤除消力墩和消涡栅后,对消力池底部高度做出修改,通过试验结论确定消力池底部高度以及跌坎高程,固定的水池出口处和水面相连,改良后的尾渠更加稳定,在河流的下游处会有更明显的冲刷痕迹并且冲刷后的最低点与消力池尾部距离更远。

In recent years,with the rapid development of high dam construction,there are higher requirements for flood discharge and energy dissipation technology.Under high-speed flow,the traditional design of flood discharge and sediment discharge tunnel can not meet the functional requirements of flood discharge tunnel.Based on the hydraulic model test of the flip energy dissipator at the outlet of the spillway tunnel of the reservoir of Luoning pumped storage power station.When the height and angle of the flip bucket are set to fall,the water tongue is no longer affected by the lower water body,and the effect of scattering overturning energy is good.In addition,the performance can be improved.After the stilling pier and vortex grid are removed,the bottom height of the stilling basin is modified.The bottom height of the stilling basin and the falling sill elevation are determined through the test conclusion.The fixed pool outlet is connected with the water surface.The improved tailrace is more stable,there will be more obvious scouring marks at the downstream of the river,and the lowest point after scouring is farther from the tail of the stilling basin.