文档介绍：北京建筑工程学院硕士学位论文虹吸式屋面雨水排放系统虹吸形成过程研究姓名:林增玉申请学位级别:硕士专业:市政工程指导教师:王文海 20080601 北京建筑工程学院硕士学位论文摘要论文从理论分析、数值模拟和实验三个方面对单斗虹吸雨水排水系统的虹吸形成过程进行了研究。理论分析部分应用明渠非均匀渐变流理论分析了水流经过连接管进入悬吊管后形成的流态变化。并分析了单斗虹吸雨水排水系统虹吸形成的启动时间及其在不同降雨历时下对单斗虹吸雨水排水系统的影响。数值模拟部分应用Fluent软件对虹形成最小流量下水流通过悬吊管时管中水流进行了模拟。通过理论和数值模拟分析了当连接管K度较短,悬吊管相对较长时,从自由液面到悬吊管末端运用满管流的伯努力方程的可行性。通过模拟的数据与运用伯努力方程的计算数值进行了对比。论文在实验部分对单斗系统在不同管径、不同的连接管和悬吊管长度条件下进行实验, 观测了连接管和悬吊管中水的流态。研究结果表明,在连接管长度较短、流量为虹吸形成最小流量下单斗虹吸雨水排水系统中悬吊管中可以实现大部分的水流状态为满流,管径较大时仅在恳吊管出口存在一小段跌水;连接管长度和悬吊管长度对系统内虹吸是否形成是存在影响的;同时连接管长度存在一个最小值,这个最小值是可以通过伯努力方程计算得出的;FLUENT软件模拟单斗虹吸雨水排水系统是有效的。关键词:虹吸形成最小流量,数值模拟,悬吊管流态,连接管长度,虹吸启动时间 2 北京建筑丁程学院硕士学位论文 Abstract The thesis research on the one—outlet siphonic drainage system from the theoretical analysis、CFD simulation and experiment aspects. In the theoretical analysiS chapter,the condition of the water which flow through the spigot pipe into the hanged pipe was analyzed by the theory of the uniformity gradually changed trench start—up time of the one—outlet siphonic drainage system and it’S influence tothesystem under different rainfall are al so be researched. Inthe CFD simulation chapter,the water flow through hanged pipe under the minimum volume flow was the numerical simulation and the theoretical analysis,the feasibility that if the Bernoulli equation can be use to the system which from the still water above the runoff and theend of thehanged pipe was construe when the spigot pipe isshort and the hanged pipe isrelatively simulation date and the value which got by the Bernoulli equation pared. Inthe experiment chapter,experimentation was made under different spigot pipe and hanged pipe,and the flow condition inthe spigot pipe and the hanged pipe was ob served. The research indicate that the hanged pipe isfull when the spigot pipe isshort and the flux iS the minimum volume flow,and there exist a drop at the end of the hanged pipe if the pipe isbig:The experiment show that the length of the spigot pipe and hanged p