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在保证消力池容积不变的情况下,采用水工模型试验和标准κ-ε紊流数学模型相结合的方法,对不同尾坎纵向坡度的消力池进行了模型试验和数值模拟,研究了消力池尾坎坡度(90°、75°、60°、45°)对消力池内水流流动特性和消能率的影响,并将计算结果与水工模型试验结果进行对比验证。结果表明,数值计算结果与模型试验吻合较好,所采用的数值模拟方法可行;在保证消力池容积不变的情况下,尾坎坡度越大,消能效果越好,临底流速越小;但尾坎纵坡越大,消力池内水深增加,底板压强越大,边墙设计中应予以考虑。因此,在实际工程中应合理设计尾坎坡度,兼顾消能效果和两侧边墙高度要求。
Under the condition that the volume of stilling pool is constant, the model test and numerical simulation are carried out on the stilling basin with different longitudinal ridge slopes by the combination of hydraulic model test and standard κ-ε turbulence mathematical model The effects of trough slope (90 °, 75 °, 60 °, 45 °) on the flow characteristics and energy dissipation rate in the stilling pool were investigated. The calculated results were compared with the hydraulic model test results. The results show that the numerical calculation is in good agreement with the model test, and the numerical simulation method is feasible. The bigger the slope of the tail ridge is, the better the energy dissipation effect is, while the smaller the bottom flow rate ; However, the larger the tail ridge, the deeper the water depth in the stilling pool, the greater the pressure in the bottom wall should be taken into account in the design of the side wall. Therefore, the actual project should be reasonable design caudal slope, taking into account the effect of energy dissipation and both sides of the wall height requirements.