低Fr数非完全宽尾墩消能特性研究

Study on Dissipation Characteristics of Incomplete Flaring Gate Pier with Low Froude Number

为了在低Fr数底流消能中应用宽尾墩来增强消能效果,通过水工模型试验和数值模拟相结合的方法研究非完全宽尾墩的消能机理和消能效果。数值模拟的计算成果与水工模型试验成果吻合较好。研究表明:非完全宽尾墩对泄流能力影响很小,不会增大消力池底板脉动压力,且可以增加消力池内的速度梯度,达到附加消能的效果,即在提高消能率的同时,可以消除出池波状水跃。非完全宽尾墩布置方案对中小型水工枢纽布置有较强的参考意义。

In order to apply flaring gate pier to the bottom-flow dissipation with low Froude number to enhance the dissipation energy, the energy dissipation mechanism and effect were researched through the combination of hydraulic model test and numerical simulation. The calculated result of numerical simulation was in good agreement with the result of hydraulic model test. It was shown that the incomplete flaring gate pier had little influence on the discharge capacity. Besides, the incomplete flaring gate pier did not increase the fluctuating pressure of stilling pool base slab, but increased the velocity gradient in stilling basin to achieve the effect of additional energy dissipation. So that the incomplete flaring gate pier was a meaningful reference to the arrangement of middle and small hydraulic complex.