重庆李家口水电站溢洪道设计及消能效果分析试验研究

Experimental study on spillway design and energy dissipation effect of Lijiakou hydropower station in Chongqing

针对重庆李家口水电站溢洪道下泄水流流速过大的情况,根据李家口水电站实际建设环境,结合设计经验,从进水渠、尾墩、泄洪隧洞、消能段几部分入手,对各部分结构进行了详细设计。建立长宽高均为1∶50的正态模型进行概化模型试验。从试验效果来看,进水渠、尾墩两侧、泄洪隧洞弯曲段,以及溢洪道末端的水流都较为平缓,没有出现明显的壅水、冲击波、乱流等不利流态。本文设计的挑流消能段消能效率高达79.5%,有效消耗了下泄水流能量,减小了下泄水流流速,消能效率良好,对保证下游河床稳定有积极作用。

Because of the too large flow velocity of the spillway in Chongqing Lijiakou Hydropower Station, the structures such as the inflow channel, the tail pier, the flood discharge tunnel and the energy dissipation section are designed in detail based on the actual construction environment and the experience. A normal model with length and width is 1 ： 50 is established. From the experimental results, the flow of the inlet channel, both sides of the tail pier, the bending section of the flood discharge tunnel and the end of the spillway are gentle, there is no obvious backwater, shock waves, turbulence and other unfavorable flow. The efficiency of the energy dissipation section designed in this paper is as high as 79.5%. It dissipates the energy of the discharge flow effectively and reduces the speed of the current and ensure the stability of the downstream river bed.