黄登水电站燕尾型挑坎挑流消能适用性试验研究

Applicability Test of Swallow-tailed Flip Bucket Ski-jump Energy Dissipation for Huangdeng Hydropower Station

针对黄登水电站泄洪消能原方案存在的问题,通过1∶50整体水工模型试验,研究了传统挑坎(窄缝坎、扩散坎、斜切坎)与新型燕尾坎在黄登水电站表、底孔上的适用性问题,分析了燕尾坎对挑流消能的影响。结果表明,与传统窄缝坎相比,燕尾坎对上游来流的适应性更好,挑坎边墙的动水荷载小,在拉近最近挑距、避免对右岸边坡和下游围堰堰脚冲刷的同时,减小了电站尾水区附近水流的波动,水垫塘内底板基岩的冲淤结果满足"护坡不护底"的要求,可供类似工程参考。

To solve the problem of original discharge energy dissipation scheme for Huangdeng Hydropower Station,by 1∶50scale hydraulic model test,the applicability problems of the traditional flip bucket（slip-type bucket,diffusion bucket and miter flip bucket）and the swallow-tailed flip bucket for crest outlet and bottom outlet are studied.Then the influence of swallow-tailed flip bucket on ski-jump energy dissipation is analyzed.The results show that the stabilization of swallow-tailed flip bucket jet is less influenced by the upstream flow and the hydrodynamic load on the wall is reduced.Meanwhile,the new flip type can avoid the scour of right slope and downstream cofferdam by cutting down the nearest jet trajectory length,and decreases the fluctuation of tail water.Sour and deposit for the bedrock meet the requirement of the plunge pool with lining slope but no bottom.The results can provide reference for the similar engineerings.