Author(s): Wenjiao Zhang; Lei Liu; Zhongmei Wang; Ying Zhao; Nengming Hu

Linked Author(s): Wenjiao Zhang, Lei Liu, Ying Zhao

Keywords: Spillway; Hydraulic characteristics; Numerical simulation; Physical model; Optimal layout

Abstract: Compared with the general spillway, the open spillway with wide single chute is prone to complicated flow pattern and poor aeration effect. Taking the Baleh Hydropower Project in Malaysia as an example, this paper uses the VOF method and the RNG k-ε two-equation turbulence model to carry out a three-dimensional numerical simulation of the spillway flow field. The calculation and analysis of the distribution law of the hydraulic characteristics of the spillway under different working conditions, such as flow pattern, velocity, and pressure along the way, were carried out. At the same time, a 1:50 physical model test was established. After comparative analysis, the model test results were basically consistent with the numerical simulation results, which verified the accuracy and feasibility of the numerical simulation of the hydraulic characteristics of the spillway with an open wide single chute. Then the turbulence model was used to calculate and analyze the optimized layout of the spillway aeration sill in detail. The results show that: after the 1# aeration sill is raised by 20cm, the length of the aeration cavity behind the sill increases from 11.03m to 19.84m, and the energy dissipation rate increases approximately doubled; after 3# aeration sill moved up 15m along the steep slope of the chute, the impact position of the tipping water tongue moved upward, reducing the impact on the flow pattern of the tipping nose sill section. The research results have a certain reference effect on the optimization design for similar projects.

DOI: https://doi.org/10.3850/IAHR-39WC252171192022678

Year: 2022