Author(s): Zongshi Dong, Junxing Wang, Junrong Da, Ziyi Lian, Wenchuan Zhang
Linked Author(s): ZongShi Dong
Keywords: destruction mechanism, stepped spillway, X-shaped flaring gate pier, air concentration, impact pressure
Abstract:
The combined energy dissipater of the X-shaped flaring gate pier and stepped spillway was invented under the specific condition of flood discharge and energy dissipation in Suofengying hydro-plant of China using this mechanism of which has been deeply studied by model testing. However, varying degrees of erosion destruction occurs on the step surface in the later popularization and application process in Dachaoshan Hydro-plant and Ludila Hydro-plant. In order to study the destruction mechanism of the step behind the X-shaped flaring gate piers, a hydro-plant on Jinsha River was investigated as an example. The parameters of water nearby the step surface, such as fluctuating pressure, impact pressure, fluid velocity and air concentration were analyzed by model test and numerical simulation. The simulated results are in good agreement with the model test results. The results show that the impact pressure on step surface is not enough to cause breakage on the step structure, while the low aeration region on the step surface is basically in coincidence with the destruction region, which means the lack of aeration is the reason that results in the erosion destruction on the step surface. The investigated results in the paper can provide reference for similar projects. (2622, 68, 328)
Year: 2017