水利水电科技进展2018，Vol.38Issue(3)：1-7,7.DOI:10.3880/j.issn.1006-7647.2018.03.001
高拱坝表孔宽尾墩体型参数对泄流能力的影响
Effects of flaring gate piers with different shape parameters on discharge capacity of surface spillway in a high arch dam
摘要
Abstract
The surface spillway is generally short for high arch dams due tothe thin dam crest. Discharge capacity can be affected if flaring gate piers are applied to surface spillway in high arch dams. Numerical simulation was carried out on the basis of the Dongzhuang water conservancy project to explore the flaring gate piers that can meet the design requirements for discharge capacity. The effects of plunge angles, contraction ratios, deflection angles on discharge capacity and the relationship between discharge capacity and Froude number along the surface spillway were studied. The results show that the discharge capacity of surface spillway decreases with the decrease of plunge angles,contraction ratios and the horizontal distance between starting flare and weir crest but it increases with the decrease of deflection angles. A comprehensive influence coefficient k综 is proposed to reflect the effect of the shape parameters of flaring gate piers and water head over the weir. For k综≥2,flaring gate piers have no effect on the discharge capacity of a surface spillway. For k综<2,the effect on discharge capacity is gradually enhanced with a decreasing k综.There is a knee point on the curve of Froude number along the surface spillway in the upstream of the starting flare. The discharge capacity is less affected by higher Froude number at the knee point.关键词
高拱坝/宽尾墩/泄流能力/体型参数/弗劳德数/数值模拟Key words
high arch dam/flaring gate piers/discharge capacity/shape parameter/Froude number/numerical simulation分类
建筑与水利引用本文复制引用
练继建,桑林瀚,缑文娟,李会平..高拱坝表孔宽尾墩体型参数对泄流能力的影响[J].水利水电科技进展,2018,38(3):1-7,7.基金项目
国家自然科学基金(51409187,51509180) （51409187,51509180）
天津市应用基础与前沿技术研究计划(15JCQNJC07100) （15JCQNJC07100）
