基于大涡模拟的嵌槽式消力池内水力特性研究

Study on hydraulic characteristics in deflecting stilling basin based on large eddy simulation

传统平底式消力池可能造成临底流速和脉动压强偏大等问题,而嵌槽式消力池可有效降低临底水力学指标。为深入研究嵌槽式消力池内水力特性,基于FLOW-3D软件,采用大涡模拟湍流的方法对平底式消力池和嵌槽式消力池进行三维数值模拟,对比了池内流态、时均压强、脉动压强及频域能量特性。研究结果表明:数值模拟与模型试验结果吻合良好,相比于平底式消力池,嵌槽式消力池可以有效改善消力池流态,降低临底流速,显著降低底板处的脉动压强均方根,从而降低消力池底板破坏的可能性。

The traditional flat-bottom stilling basin may cause problems such as high bottom velocity and large fluctuating pressure,while the deflecting stilling basin can effectively reduce the bottom hydraulic index.In order to study the hydraulic characteristics in the deflecting stilling basin,based on the FLOW-3D software,a three-dimensional numerical simulation for the flat-bottom stilling basin and the deflecting stilling basin were carried out by using the method of large eddy simulation(LES).The flow pattern,time-average pressure,fluctuating pressure and frequency domain energy characteristics were compared and studied.The results showed that the numerical simulation was in good agreement with the model test results.Compared with the flat-bottom stilling basin,the deflecting stilling basin could effectively improve the flow pattern in the stilling basin,reduce the bottom velocity,and significantly reduce the root mean square of the fluctuating pressure at the bottom plate,thereby reducing the possibility of the destruction of the bottom plate of the stilling basin.