关键词: 嵌槽式消力池;平底式消力池;水力特性;大涡模拟;临底流速;脉动压强;

Abstract: 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.

Key words: deflecting stilling basin; flat-bottom stilling basin; hydraulic characteristic; large eddy simulation; bottom velocity; fluctuating pressure