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高水头平面闸门后接平坡明流段,且出口采用突扩突跌的掺气设施,其水力特性复杂,实际工程中研究及运用较少.结合设计采用该形式的龙开口水电站冲沙底孔,应用标准双方程紊流模型和VOF多相流方法对其流道流场进行了三维数值模拟,对闸门出口突扩突跌段特性、平坡泄槽段水力特性进行研究,并将部分结果与模型试验成果进行比较,两者符合较好.通过数值模拟与模型试验相互验证对其体型进行优化,提出闸门段压力分布均匀的出口收缩方式、出口加挑坎的跌坎掺气体型,在平坡泄槽上取得了良好的掺气效果,为工程设计提供参考.
The high-head plane gate is followed by the Ming-flow section of Ping-po, and the outlet adopts the aeration device with sudden expansion and sudden drop. Its hydraulic characteristics are complex and there are few researches and applications in practical engineering. Combined with the design of the Longkoukou Hydropower Station, Hole, two-dimensional turbulence model and VOF multi-phase flow method were used to simulate the flow field of the flow field. The characteristics of sudden exit and sudden drop in the gate exit and the hydraulic characteristics of the flat slope were studied, The results are in good agreement with the results of the model test, which are in good agreement with each other.Through the mutual verification of the numerical simulation and the model test, the body shape is optimized, the outlet contraction mode with uniform pressure distribution in the gate section, A good aeration effect has been obtained on the flat slope drain, which provides a reference for engineering design.