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结合大渡河泸定水电站右岸2#泄洪洞出口消力池体型优化试验,在一般浅水垫消力池体型的基础上,提出了一种双浅水垫消力池的新体型。为了深入探究该型消力池的消能机理及其水力特性,采用三维RNGk-ε紊流模型对双浅水垫消力池进行了数值模拟计算研究,并与传统的底流消力池及单浅水垫消力池(跌坎式)的数值计算结果进行了对比分析。结果表明,双浅水垫消力池更能充分发挥浅水垫的“垫层”作用,能有效地降低消力池临底流速,水跃流态更好且稳定,消能效果较佳;同时,消力池底板动水压力分布也更加均匀,对消力池稳定性和安全有利。
Combined with the optimization test of the stilling pool at the outlet of No. 2 spillway tunnel on the right bank of Luding Hydropower Station on the Dadu River, a new type of double shallow water pad stilling tank was proposed on the basis of general shallow water pad. In order to further explore the energy dissipation mechanism and hydraulic characteristics of this type of stilling pool, a three-dimensional RNGk-ε turbulence model was used to study the numerical simulation of the double-shallow water-cushion stilling pool. Compared with the traditional underflow stilling pool and single shallow water The comparison of the numerical calculation results of the stilling pool (drop-off type) was carried out. The results show that the double shallow water cushion still can fully play the role of “cushion” of shallow water cushion, which can effectively reduce the bottom flow velocity of the stilling pool. The water jump flow state is better and stable, and the energy dissipation effect is better. At the same time, hydrodynamic pressure distribution on the floor of the stilling pool is also more uniform, which is beneficial to the stability and safety of the stilling pool.