摘要
依托武汉大东湖深隧建设项目,采用流体力学分析软件(ANSYS 15.0-FLUENT)对落步咀预处理站的入流竖井进行建模分析,对比了两种典型竖井(涡流式和折板式)在不同工况下的消能和排气效果。模拟结果表明,在正常工况下,涡流式竖井中心入流筒中能形成附壁螺旋流,出流管末端断面平均流速为2.1 m/s,水相体积分数为0.991;折板式竖井通过流体在折板间的反复跌落实现消能和排气,出流管末端断面平均流速为3.0 m/s,水相体积分数为0.983。在过载工况下,两种竖井均不具备排气、消能效果。综合对比两种竖井的排气和消能效果,涡流式竖井略优于折板式竖井,且折板式竖井在大流量工况下会冲击井壁,影响竖井结构安全。
The inflow shaft of Luobuzui sewage pretreatment station was simulated by fluid mechanics analysis software(ANSYS 15.0-FLUENT)based on the project of Dadonghu deep tunnel in Wuhan,and the energy dissipation and exhaust effect of two typical shafts(cyclone shaft and folded plate shaft)were compared under different operational conditions.Spiral flow could be formed in the central inlet tube of the cyclone shaft,and the average velocity at the end of the outlet pipe was 2.1 m/s and the volume fraction of water phase was 0.991.The energy dissipation and exhaust were realized by the fluid falling repeatedly between the folded plates in the folded plate shaft,the average flow velocity at the end section of the outlet pipe was 3.0 m/s and the volume fraction of water phase was 0.983.Under overload condition,both shafts had no exhaust and energy dissipation effect.By comprehensive comparison of the exhaust and energy dissipation effect of the two shafts,the cyclone shaft was slightly better than the folded plate shaft.The folded plate shaft would impact the shaft wall under the condition of large flow,and it would affect the structural safety of the shaft.
作者
徐剑乔
XU Jian-qiao(China Railway Siyuan Survey and Design Group Co.Ltd.,Wuhan 430063,China)
出处
《中国给水排水》
CAS
CSCD
北大核心
2019年第21期125-131,共7页
China Water & Wastewater
关键词
深层隧道
入流竖井
多相流
数值模拟
计算流体力学
deep tunnel
inflow shaft
multiphase flow
mathematic simulation
computational fluid dynamics
