渠底螺旋流形成及其流速结构的分析研究

Research on the Formation and Sediment Incipient Mechanism of Spiral Flow at the Bottom of a Ditch

渠底涡管螺旋流排沙是利用涡管内产生的螺旋流排除渠道中来沙的一种泥沙处理技术。渠底涡管排沙的机理是水沙的惯性作用和边界条件相结合的产物。在涡管内水流沿管方向运动,同时受到渠道水流纵向流速的影响,在涡管内形成既有纵向流速又有横向流速的水流运动,从而形成螺旋流。为对渠底螺旋流形成及流速结构有一个比较深入的认识,首先分析了影响渠底螺旋流形成的关键因素,并通过已有的试验资料对渠底涡管内螺旋流横向流速分布进行分析计算,然后讨论了不同流量不同底坡对流速分布的影响,得出了关于渠底螺旋流的规律性结论。

For a deeper understanding of the sediment transportation technology in spiral flow of the ditch bottom, Firstly the key aspects of spiral flow formation conditions at the bottom of ditches are analyzed, and the landscape orientation velocity distribution of spiral flow of ditch bottom on the base of the experimental information is calculated. Secondly the effects of different runoffs and slopes on velocity distribution are discussed, and some conclusions are made.