摘要
通过物理模型试验和数值模拟计算,对比研究了不同有压出口高度时多级洞塞泄洪洞各项水力特性参数,分析了出口高度对泄洪洞泄流能力、洞身压强及消能率的影响。结果表明,随着出口高度的降低,泄洪洞泄流量减小,流量系数增大;洞身压强整体呈增大趋势,出口压坡高度的变化主要对洞塞及其以后洞段的壁面压强影响较大,而对上平段影响相对较弱;泄洪洞整体消能率逐渐减小,出口高度对竖井洞塞和压坡洞塞消能率影响较大,而对水平洞塞组的消能率影响甚微。
Model test and numerical calculation were used to study the hydraulic characteristic parameters of multistage plug discharge tunnel with different outlet height.The impact of outlet height on discharge capacity,pressure and energy dissipation rate was analyzed.The results show that lower outlet height gets less discharge capacity and larger discharge coefficient.With the outlet height reducing,the pressure of whole tunnel increases,and the changing of outlet height makes a relatively remarkable influence on pressure of plugs and the downstream segments,while upper horizontal segment is affected relatively weak.Meanwhile,the energy dissipation rate of the whole tunnel is decreasing,and the outlet height makes a considerable impact on energy dissipation rate of vertical plug and slope plug,while the energy dissipation rate of horizontal plugs is almost unaffected.
作者
海琴
周磊
HAI Qin;ZHOU Lei(Yangling Vocational and Technical College,Yangling 712100,China)
出处
《水电能源科学》
北大核心
2019年第2期99-102,共4页
Water Resources and Power
关键词
水利工程
多级洞塞泄洪洞
泄流能力
压强
消能率
hydraulic engineering
multi-stage plug discharge tunnel
discharge capacity
pressure
energy dissipation rate
