草街水电站尾水渠段扩挖清淤优化方案研究

嘉陵江草街水电站尾水渠段由于乱石突出,水流紊乱,河床淤塞,导致运行尾水位偏高,水头损失增大,水轮机工作水头降低.针对上述问题,拟通过对渠道扩挖清淤,改善尾水渠流态,保证下泄畅通,降低尾水位,扩大水电站发电效益.建立了尾水渠段二维水流数学模型,模拟计算了多级流量下尾水渠清挖范围内水位、流场及流速分布情况,计算成果表明,扩...

Optimization Study on the Tailrace Channel Dredging Scheme of Caojie Hydropower Station

Rocks,turbulent flow and despositing near the tailrace channel of Caojie Hydropower Station in Jialing River result in a high water level and head loss increase,which leads to the reduction of turbine operation head.In view of these problems,it is proposed to improve the flow pattern of tailrace channel and keep the water flowing smoothly by digging and dredging,which can lower the water level of tailrace channel and increase power generation benefits of station.A two-dimensional flow model about the tailrace channel of Caojie Hydropower Station is established,and the water level,flow field and velocity distribution within the digging and dredging range of the tailrace channel under multi-level flow are simulated.The results of numerical simulation show that the change of tailrace water level is limited to 300 m below the dam after digging and dredging,and the effect of design scheme and two optimization schemes to reduce the tailrace water level is basically the same.Considering the amount of digging and dredging and the velocity distribution in tailrace,the first optimization scheme is recommended.