带尾墩的新型综合消力池试验研究

Experimental Study on a New Type of Integrated Stilling Pool with Tail Piers

消力池内常因消能不足而引起水流流态紊乱、临底流速大、出池后有二次水跃等问题。结合某待建水利工程,开展了带尾墩的新型综合消力池水流特征试验研究。通过对比原方案与9个优化方案,得到以下结论:在消力池尾坎上设置差动式尾墩后,下泄水流分多股支流进行纵向和横向扩散消能,水流流态稳定,消能率增大。消力池加深1 m、加宽4 m且增加差动式尾墩的消能方案消能效果明显,池内形成稳定淹没水跃,出池后二次水跃现象明显消除。

The conventional stilling pool often causes flow instabilities in the pool,secondary water jumps after exiting the pool and high velocity near the bottom due to insufficient energy dissipation within the pool.The water flow characteristics of a new type of integrated stilling pool with tail piers are studied for a certain practical project.The original design scheme is compared with nine optimized schemes,and the results show that,when the differential tail pier is installed on the tail sill of the stilling pool,the discharge water is diffused longitudinally and laterally into multiple tributary streams,and there is no large fluctuation for the water surface,the flow pattern is stable and the energy dissipation rate is evidently increased.The scheme which will deepen the pool by 1 m,widen the pool by 4 m and set differential tail pier has best energy dissipation effect,and can form a stable submerged hydraulic jump within the pool and eliminate the secondary hydraulic jump at the downstream of the pool.