适应狭小扩散空间的舌型差动挑流鼻坎优化研究

Optimization Research on Tongue-Type Differential Flip Bucket Adapted to Narrow Diffusion Space

中文关键词:抽水蓄能电站  狭小扩散空间  泄洪洞  舌型差动挑流鼻坎  高水头  水工模型试验

keywords:pumped storage power station  narrow diffusion space  flood discharge tunnel  tongue-shaped differential trajectory bucket  high water head  hydraulic model test

中文摘要:针对水利工程下游消能区“左岸无扩散空间、对岸距离较近”的狭小扩散地形条件，以某地区抽水蓄能电站为研究对象，建立泄洪排沙洞1∶60模型，并提出舌型差动挑流鼻坎的修正方案。试验结果表明：舌型差动挑流鼻坎可以产生纵向拉开与横向扩散相结合的挑流水舌，在较低水位即可形成挑流，避免了跌流直接冲击鼻坎基础；在高水位时水舌落点分散且远离两岸坡，使下泄水流能顺利归槽，下游河道冲刷情况较好，可为其他类似工程提供借鉴与参考。

Abstract:Aiming at the narrow diffusion topographic conditions of "no diffusion space on the left bank and short distance to the opposite bank" in the energy dissipation area downstream of water conservancy projects，taking a pumped storage power station in a certain area as the research object，a 1:60 model of the flood discharge and sediment flushing tunnel is established，and a modification scheme of the tongue-type differential flip bucket is proposed. The test results show that the tongue-shaped differential trajectory bucket can generate a trajectory jet combining longitudinal stretching and transverse diffusion，which can form trajectory flow at a relatively low water level，avoiding the direct impact of falling flow on the bucket foundation. At high water levels，the jet falling points are scattered and far away from the slopes on both banks，enabling the discharged water to flow back into the channel smoothly with minor downstream riverbed scouring，which can provide a reference for other similar projects.