溪洛渡水电站泄洪洞出口挑流鼻坎体型优化研究

溪洛渡水电站采用坝身孔口与岸边泄洪洞相结合的泄洪消能方式。左、右岸各布置两条常规泄洪洞,是目前国内最大规模的泄洪隧洞。在正常水位泄洪时,泄洪洞最大流速近50 m/s,消能防冲设计难度大,对挑流鼻坎的水力性能要求很高。针对原设计方案中下游水舌冲刷两岸、且冲刷坑深度较大的问题,对挑坎体型进行修正。利用Bezier曲线生成技术构造出口挑坎,通过移动控制点改变挑坎的曲线和构造出口挑坎,优化了出口挑坎体型,并通过物理模型试验进行检验。

Research on shape optimization for flip bucket of spillway tunnel for Xiluodu Hydropower Station

In Xiluodu Hydropower Station,the flood discharge and energy dissipation are taken by both the dam body outlets and the spillway tunnels at banks.Two spillway tunnels are arranged on each of both the banks respectively,which are the largest ones in China at present.At the normal water level,the maximum discharging velocity of the spillway tunnel is near 50 m/s during the flood discharge,for which the design for the energy dissipation and erosion control is difficult to be made,as the requirement for the hydraulic characteristics of the flip bucket is higher.Consequently,the shape of the flip bucket designed in the original design is revised,so as to solve the problems of the nappes from the buckets to scour both the downstream banks and then form some deep scouring pits.The bucket is reformed based on the technique of Bezier curve,and then the shape of the flip bucket is optimized through moving the control point concerned to change the curve of the bucket.Furthermore,the reform of the bucket is verified through the physical model test at last.