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《Journal of Hydroelectric Engineering》 2013-05
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Experimental study on energy dissipation form of low head, large unit discharge flood discharge

HU Ming;Sinohydrd bureau 7 Co. ,Ltd.;  
Energy dissipation and anti-scour of water jump at low Froude number is a general issue in the water intake or multipurpose hydraulic projects of low water head and large flow.This issue becomes a big problem left in the water conservancy and hydropower engineering,particularly for small and medium-sized projects.According to the results of hydraulic model tests,this paper puts forth a new approach to solving this energy dissipation problem—a combined use of small deflection angle and shallow water cushion in stilling basin energy dissipation.Our model tests show that a sill of small deflection angle has a diffusion effect.When the flow and tail level are low,the outflow nappe was deflected up a little,diffused in horizontal and vertical directions,and then plunges into the stilling basin with a smaller unit discharge,forming a hydraulic jump.A sloped baffle sill installed at the basin tail end can adjust the velocity distribution of outflow and improve the basin flow hydraulics.Thus,this study verifies that this stilling basin design is a good approach to energy dissipation and anti-scour of water jump at low Froude number.
【CateGory Index】: TV135.2
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