龙英水库溢流坝挑流消能工优化试验研究  

Experimental study of overflow dam ski-jump energy dissipator for Longying Reservoir Project

作　　者：覃培 张小飞[1] 黄佳敏 肖天培 QIN Pei;ZHANG Xiao-fei;HUANG Jia-min;XIAO Tian-pei(College of Civil Engineering and Architecture,Guangxi University,Nanning 530000,China)

机构地区：[1]广西大学土木建筑工程学院,南宁530000

出　　处：《广西水利水电》2021年第2期6-9,33,共5页Guangxi Water Resources & Hydropower Engineering

摘　　要：龙英水库溢流坝采用连续式鼻坎挑流消能方式,由于两侧导墙收缩角远大于常见范围,在泄流时沿两侧导墙和堰面下泄的3股水流在挑坎上出现碰撞,产生向上跃起的水冠,水冠不稳定,对下游的消能防冲、防雾带来不利影响,需要对消能工进行优化。通过水工模型试验,从水流的角度对消能工的布置方案进行优化。试验结果表明:在挑坎处设置分流墩可以改善挑坎处水流的稳定性,避免或减轻挑流水舌对两岸的冲刷,减轻雾化;与矩形分流墩相比,Y形、倒梯形分流墩在消除挑坎处水流碰撞产生的水冠方面效果不明显,却增加了分流墩在结构上的复杂性;采用等间距布置2个分流墩,每个分流墩分别与相邻侧的调直段导墙成9.7°夹角的分流墩的布置方案,可以改善挑坎处水流的稳定性,避免或减轻挑流水舌对两岸的冲刷,减轻雾化。Continuous deflecting bucket was adopted as the energy dissipation mode of overflow dam for Longying Reservoir.Because the contraction angle of the guide wall on both sides is much larger than the common range,three streams discharged along the guide wall and the weir surface collided on the flip bucket when discharging,resulted in the water crown that jumps upward.The water crown is unstable,which had adverse effects on the downstream energy dissipation and anti-atomization.The energy dissipator needs to be optimized.Hydraulic model test was conducted to optimize the layout scheme of energy dissipater from the perspective of water flow.The results of test demonstrate that diversion pier at the bucket is able to improve the stability of water flow at the flip bucket,avoid or reduce erosion of trajectory nappe on both sides,alleviate atomization.Compared with rectangular diversion pier,Y-shape or inverted trapezoidal diversion piers had no obvious effect on eliminating the water crown caused by water collision at the flip bucket,but it increased the structural complexity of diversion pier.Two diversion piers were arranged with equal spacing,and each diversion pier was arranged with an angle of 9.7°to the guide wall of the straightening section on the adjacent side.This layout scheme is able to improve the water flow stability at the flip bucket,avoid or reduce erosion of trajectory nappe on both sides,and alleviate atomization.

关 键 词：溢流坝 挑流消能工 优化 模型试验 龙英水库 

分 类 号：TV131.61[水利工程—水力学及河流动力学]