某水库溢洪洞体型优化水力特性试验研究

Experimental Study on Hydraulic Characteristics of Shape Optimization of Spillway Tunnel in a Reservoir

为某水库工程溢洪洞的体型优化对其溢洪洞模型进行试验研究,得到试验结果:溢洪洞原设计方案在进口闸墩附近产生绕流,特别是右侧墩头绕流严重,造成进流不均匀。溢洪洞进口渐变段收缩角大、坡度陡,导致洞内产生左右摆动的冲击波,洞内水面不仅沿纵向起伏变化,而且在横断面上的水深发生局部壅高。通过对原设计方案溢洪洞体型进行优化,洞内水面水翅高度、水面波动明显减小,水流流态得到明显改善。

In order to optimize the shape of spillway tunnel in a reservoir project,the model of spillway tunnel is tested and the results show that the original design scheme of spillway tunnel produces flow around the inlet pier,especially at the right pier head,which results in uneven inflow.The large shrinkage angle and steep slope of the transition section at the entrance of the spillway tunnel lead to a left-right swing shock wave in the tunnel.The water surface in the tunnel not only fluctuates along the longitudinal direction,but also locally backs up the water depth on the cross section.By optimizing the shape of the spillway tunnel in the original design scheme,the height of the water wing and the fluctuation of the water surface in the spillway tunnel are obviously reduced,and the flow pattern is obviously improved.