Author(s): Han Changhai; Tan Gaowen; Yu Kaiwen; Han Kang
Linked Author(s):
Keywords: Low Froude number water flow; Two-stage energy dissipation basin; Body parameters; Hydraulic characteristics; Energy dissipation mechanism
Abstract: The two-stage stilling basin is an effective way of solving the problem of energy dissipation in low Froude (Fr) number flow. However, to date, there have been little research on the shape parameters and energy dissipation mechanisms of the two-stage stilling basin. To address this issue, the body parameters and their sensitivity in the two-stage stilling basin with low Fr flow are studied by combining theoretical analysis and a physical model. At the same time, based on the optimal body of the stilling pool determined by experiments, the hydraulic characteristics of single-stage and two-stage stilling basin with low Fr flow are studied and compared. The results show that the parameters of the stilling basin such as length, depth, and end sill height all have thresholds. If a parameter exceeds the threshold, the undular or repelled downstream hydraulic jump tends to occur in the first stage stilling basin, while the water surface fluctuation in the second stage stilling basin increases significantly. Under the condition of low Fr flow, the adaptation interval of the two-stage stilling basin to the downstream tail water level increases significantly, and the fluctuation of the downstream water level is smaller, which can effectively solve the problem of large fluctuation of the downstream water surface of the single stilling basin and improve the energy dissipation rate.
Year: 2020