大流速、高弗劳德数弯道水流流态控制研究

为研究大流速、高弗劳德数条件下弯道水流的水力特性,以某水利工程为例,提出采用"前置掺气坎+渠底局部超高+阶梯"相结合的弯道水流控制新技术。试验结果表明,采用该技术后弯道段水流流态良好、横向水深和流速分布较均匀、弯道段沿程流速增加较小、弯道后水流衔接平顺,各项水力指标均满足工程应用要求。研究成果对类似工程提供参考和指导。

Study on Flow Regime Control of High Velocity and Large Froude Number

In order to study the hydraulic characteristics of the bend flow under the conditions of large flow rate and large Froude number, a new flow control technology which combines the pre aeration canals with spillway canal bottom ultra high and stepped spillway is proposed by taking a water conservancy project as an example. The test results show that taking this technology could improve the flow pattern in the curve section and make the distribution of the depth and velocity of the cross section more uniform. The flow velocity along the curved section increases little, and the flow after the bend is smoothly to connect the stilling pool; all the hydraulic indexes meet the engineering application requirements. The research results provide reference and guidance for similar projects.