Study on Hydraulic Characteristics of Spillway Dam of Dayingjiang Fourth-Level Hydropower Station
The paper conducts computational fluid dynamics(CFD)numerical simulations on two overflow dam layout schemes proposed during the design phase of the Dayingjiang Fourth-Level Hydropower Station:Scheme One,comprising an overflow dam with sand flushing bottom orifices on the right side,and Scheme Two,comprising an overflow dam with sand flushing gates on the left side and sand flushing bottom orifices on the right side.By combining the results of hydraulic model tests with CFD numerical simulation results,the paper analyzes the flow distribution patterns and energy dissipation and erosion prevention effects of the two overflow dam layout schemes.The results indicate that Scheme One is superior to Scheme Two in terms of flow patterns,velocity distribution,and energy dissipation and erosion prevention effects.However,Scheme Two is more advantageous for sediment discharge and reduction in the reservoir area,with stronger discharge capacity.By controlling the opening and closing modes of the gates,Scheme Two can adjust the corresponding outflow flow patterns,making it better suited to the high sediment content flow conditions of the Dayingjiang River.
Dayingjiang Fourth-Level Hydropower Stationoverflow damenergy dissipation and erosion preventionnumerical simulationhydraulic model test
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