某水库泄洪明渠末端扩散段急流控导试验研究

通过对某水库泄洪排沙系统的水力模型进行试验研究,发现陡槽明渠末端扩散过渡段水流流态不稳,主流贴岸冲刷严重,为了保证泄流系统的正常运行与堤防安全,必须协调好扩散过渡段前后的水流衔接。基于急流控导理论,提出了边岸导流、水下潜没控制两个控导方案。模型试验研究表明在扩散段加设管桩坝,可以将扩散段主流导向扩散段中央,边岸流速有所减小;采用创新性的组合潜没三角翼在均衡水流和抑制边界层分离都有很好的效果,实现了主流居中稳定、大大减轻了扩散段末端护坦冲刷和右边岸堤防冲刷,研究成果对解决同类型工程问题有一定的借鉴意义。

Experimental research on supercritical flow regulation in diffusion section with the end of flood discharging channel

This paper analyzes the hydraulic characteristics in the diffusion section of open channel and various flow characteristics caused by boundary layer separation. It is found the flow is instable in diffusion section of flood discharging channel ends， and the mainstream closed to bank has a serious influence on channel erosion by researching the hydraulic model experiment of flood-sand discharging system of the reservoir. In order to ensure the normal operation of flood discharge system and the safety of embankment， flow convergence is must be well coordinated at the diffuser transition section. Two schemes that shore-side diversion and submerged control are proposed based on the theory of supercritical flow control. The model test showed that the mainstream of diffuser will be in the center and the flow of side shore rate will be reduced， if in additional tubular-pile spur in diffusion section；The innovative flow diversion equipment-submerged triangle wing that can restrain boundary layer separation is proposed in this paper， it makes mainstream center stable and greatly reduces the apron and right shore embankment erosion. It has certain reference significance to solve the same type of engineering problems.