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雷公洞枢纽是岩溶地区堵塞溶洞形成的水利水电工程,受其特殊的地形地质条件限制,泄洪洞采用了较为罕见的倒U型布置,洞内最大水头140m,下游陡坡泄槽段最大流速高达50m/s左右,各种因素使得本工程泄洪洞水力特性变得十分复杂.通过模型试验研究这种高水头、高流速且布置形式特殊的泄洪洞水力特性:水流流态、压力、流速以及空化情况等,并比选了不同的闸门方案及闸门槽与下游泄槽之间的衔接段体型,给出了泄洪洞体型的优化修改意见,研究成果可为类似工程设计提供参考.
Due to its special topography and geological conditions, the spillway tunnel adopts a relatively rare inverted U-shaped layout with a maximum head of 140m in the cave and a maximum flow velocity of up to 50m in the downstream slope section of the steep slope / s or so, various factors make the hydraulic characteristics of flood discharge tunnel become very complicated.Through the model test study of the high head, high flow rate and the layout of the special form of discharge spillway hydraulic characteristics: water flow, pressure, velocity and cavitation And compared with different gate schemes and the body shape of the connecting section between the sluice gate and the downstream sluice, the optimized revision of the discharge tunnel shape is given, and the research results can provide references for similar projects.