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以龙潭嘴水电站工程整体水工模型试验资料为依据,采用表孔高低坎+二道坝研究了中型拱坝表孔大单宽流量泄洪消能形式。通过调整边、中表孔挑坎的位置高程及挑角来实现三孔水舌上下对撞和横向扩散碰撞消能。为达到水舌落点纵向拉开的目的,增大中表孔溢流曲线的长度,使中边表孔挑坎在纵向上形成差动。试验结果表明,在该消能形式布置下,水舌纵向拉开、横向扩散充分、对冲明显,同时在水垫塘内充分翻滚消能,对下游河道减轻了冲刷,消能效果较好。
Based on the overall hydrological model test data of Longtanzui Hydropower Station, the flood discharge and energy dissipation form of large single-width flow in the middle large-sized arch dams was studied by using the high and low level canopies + Erdaoba. By adjusting the edge of the table in the hole pick ridge elevation and pick angle to achieve three holes up and down the water tongue collisions and lateral diffusion collision energy dissipation. In order to achieve the purpose of opening the longitudinal drop of the water tongue, the length of the overflow curve of the middle hole is increased so that the middle surface pick of the surface hole forms a differential in the longitudinal direction. The experimental results show that under the pattern of dissipating energy, the water tongue can be pulled longitudinally and spread horizontally with obvious hedging. At the same time, it can fully tumble and dissipate energy in the plunge pool and reduce the scouring and energy dissipation of the downstream river.