高水头大流量泄洪洞挑坎体型优化及下游冲淤研究

Scour Downstream River and Optimum Geometry of Flip Bucket in Tunnel with High Head and Large Discharge

针对某水电站泄洪洞出口挑坎水力特性和下游河道冲淤特性进行了试验研究。结合水力参数和下游河道冲淤变化规律的测试,探讨了泄洪洞挑坎原设计方案存在的主要问题。对不同挑坎位置和体型进行了对比试验,分析了各个方案的优缺点,最终提出了水流条件、冲淤特性均较优的椭圆型挑坎。研究成果可为实际工程设计提供试验依据。

Experiments are carried out for the evolution of the hydraulic characteristics of the flow in the flip bucket and the scour downstream river. Measures are progressed for analyzing the feature of hydraulic characteristics and scour. Basic problems are evaluated with original design shape of flip bucket. Experimental data are obtained in different geometry of flip bucket and the general characteristics of the nappe and the scour are analyzed. On the base of experimental investigation, an optimum geometry is provided for the shape of flip bucket with the elliptic curve floor. These researches can be of help for the design in practical project and can be adopted by other projects.