水利水电科技进展2017，Vol.37Issue(6)：38-43,6.DOI:10.3880/j.issn.1006-7647.2017.06.007
Z形薄壁堰过流能力试验
Experiments on discharge coefficient of Z-shape weirs
摘要
Abstract
There is still no research reports on the hydraulic characteristics and discharge capacities of Z-shape weirs.To study the hydraulic characteristics of Z-shape weirs,six schemes of weir shapes and twelve groups of different flow discharges were carried out by model tests,and the experimental data was analyzed.The results show that,the discharge capacity of Z-shape weirsis proved to be stronger than that of linear-type weirs.Furthermore,the ratio of flow discharge of Z-shape weirs to that of linear-shape weirs (in the same channel) increases with the larger ratio of the crest length to the channel width.In addition,the flow discharge of Z-shape weirs can be calculated by the general weir formulas,and the integrated discharge coefficient is related to the water height on the crest (H),the height of weir(P),the crest length,the width of the front and back weir.The discharge coefficient has a positive relation with the ratio of crest length to channel width and the ratio of the front weir width to the back weir width while it had an inverse relation with H/P.A novel experimental formula is established in the consideration of H/P,the ratio of the crest length to the channel width and the ratio of the front weir width to the back weir width,which can estimate the discharge coefficient of Z-shape weirs.关键词
Z形堰/流量系数/展宽比/过流能力/试验研究Key words
Z-shape weir/discharge coefficient/ratio of crest length to channel width/discharge capability/experimental study分类
建筑与水利引用本文复制引用
张靖,常倩,张庆华,李树宁..Z形薄壁堰过流能力试验[J].水利水电科技进展,2017,37(6):38-43,6.基金项目
国家自然科学基金(51409155) （51409155）
