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如何有效地防止泥沙淤积是泥沙研究中的一个重要课题。螺旋流排沙,是水库减淤免淤的有效途径之一。 螺旋流排沙机理 螺旋流排沙是采用沿长度方向开口的圆形管槽与排沙洞口连接,并和来流方向成45°～60°夹角,利用边界条件在管槽中形成旋流。旋流可改变原河床断面的流速分布,加大底层流速,增加底层水流的紊动强度,使落淤过程中的泥沙随着主流向前推移。同时管槽旋流又加大了压差,增加了泄量,避免了高含沙水流在管中的淤积,水流将泥沙运至管口而排出。
How to effectively prevent sediment deposition is an important issue in sediment research. Spiral flow of sediment, reservoir siltation is an effective way to reduce silt. Spiral flow sediment removal mechanism Spiral flow sediment is used along the length of the opening of the circular tube groove and sediment outlet connection, and with the direction of flow into the 45 ° ~ 60 ° angle, the use of boundary conditions in the formation of swirl in the tube groove . Swirl can change the original riverbed section flow velocity distribution, increase the bottom flow rate, increase the turbulence intensity of the bottom water flow, so silt sediment process with the mainstream forward. At the same time, the swirl of the pipe groove increases the pressure difference and increases the amount of discharge, which avoids siltation of the high-sediment flow in the pipe, and the water flow discharges the sediment to the nozzle.