水力发电学报2018，Vol.37Issue(3)：50-58,9.DOI:10.11660/slfdxb.20180306
过渡阶梯体型对一体化消能工水力特性的影响
Influence of transitional ladder on the hydraulic characteristics of integrated energy dissipator
摘要
Abstract
Application of energy dissipators combining flaring gate piers,a stepped steep chute and a stilling basin is an effective way of solving the major problems of high-velocity flows that occur on high dams under large discharges per unit width and high working heads.But cavitation damage remains a possible threat to such overflow structures.In this study,we conduct scale model tests on a dissipator of this new type and compare its four design schemes,focusing on the hydraulic characteristics of Y-type flaring gate piers,stepped chutes and stilling basins.Scheme 1 has a steep chute with a regular staircase shape,and schemes 2-4 have a stepped chute section for transition of the step size.The results show that 1) Among the four schemes tested,the time-average pressure on the flip bucket scheme 1 is the highest,3.3％ higher than the other three schemes with a transition section.2) The transitional shapes of the stepped chute produces greater effect on the negative pressure occurring on the step surface,and its value around the edge of the second step is the largest.The largest negative pressure (-0.33 kPa) of scheme 3 is the lowest of the four schemes.3) In energy dissipation of all the schemes,the lowest dissipation rate is 51.71％ in scheme 1 and the highest 52.77％ in scheme 3.关键词
水工结构/阶梯溢流坝/过渡阶梯/负压/消能率Key words
hydraulic structure/stepped spillways/transitional ladder/negative pressure/energy dissipation rate分类
建筑与水利引用本文复制引用
董丽艳,杨具瑞,李书曌..过渡阶梯体型对一体化消能工水力特性的影响[J].水力发电学报,2018,37(3):50-58,9.基金项目
国家自然科学基金(51569010) （51569010）
