隧道火灾集中排烟温度场分布数值模拟

Numerical simulation study of temperature distribution law with central smoke exhaust mode in tunnel fire

结合某长大公路隧道防排烟工程实际,采用FDS建立模型,对火源位于排烟阀打开段外和排烟阀打开段中部时,采用双向均衡排烟、上游端单向排烟、下游端单向排烟以及设置不同纵向诱导风速时的温度场进行研究,探讨不同纵向诱导风速下隧道内拱顶处、顶隔板下方和离地面2m高度处温度分布,以获取更为全面的温度场分布特征,为长大公路隧道的防排烟设计提供参考。

Combining with a long highway tunnel smoke control engineering practice,tunnel numerical analysis model was built by FDS.As we know,different exhaust froms need to be taken when the fire is located in different locations,such as the fire is located in the opened exhaust valves or outside the opened exhaust valves.So,as the two-way balanced smoke or one-way smoke exhaust towards the upward one-way or the downward one-way exhaust and different longitudinal induced velocities were respectively taken,the temperature field in the vault and below the top diaphragm as well as at the height of 2 m from the ground was investigated with different longitudinal induced velocities.The more comprehensive distribution characteristics of temperature field were obtained.It could provide technical support for the long highway tunnel smoke control design.