台阶式溢流坝中小流量流态改善方式研究

台阶式溢流坝有显著的掺气效果和消能效果,目前在中小型工程中广泛应用。但是台阶式溢流坝在小流量浅水深的工况下,坝面上流态较差,呈现跌流或者过渡流态,容易形成水翅和水流跃离现象。为了解决上述问题,本文结合某工程通过水工模型试验研究对台阶起始端的体型进行优化,结果表明优化方案能够很好地改善较小流量时的过渡流态。

Study on Improvement of Flow Pattern on Stepped Overflow Dam with Medium and Low Discharges

The stepped overflow dam is with outstanding aeration and energy-dissipation effects.So,it is widely applied in medium and small projects.In condition of lower discharge and shallow water on the stepped overflow dam,but,the flow pattern on the dam surface is unfavorable.Drop flow or transition flow occurs.Flow wing and flow spring easily form accordingly.To solve the above-mentioned issues,the outline at the beginning end of the step is optimized in combination of study on hydraulic model tests in this paper.It shows that the optimized scheme can improve the transition flow pattern as expected while discharge is lower.