最大坡度位于出入口段的隧道火风压计算

Calculation of tunnel fire wind pressure with the maximum slope at the entrance and exit

将火灾发生在隧道出入口位置时的烟气流动和燃烧室内部的BRE羽流溢出模型进行类比分析,并借鉴BRE羽流溢出模型中部分参数的计算方式,最终得到当隧道最大坡度位于隧道出入口段时,一种基于JTG/TD70/2-02-2014《公路隧道通风设计细则》的较为直接的火风压计算方式。通过实例分析,将理论计算结果与数值模拟结果相对比,发现二者比较接近。

In this study,the smoke flow at the entrance and exit of the tunnel and the BRE plume overflow model inside the combustion chamber are used for analogy analysis.By drawing on the calculation methods of some of its parameters,a set of direct fire wind pressure calculation methods based on J TG/TD 70/2-02-2014 Detailed Rules for the Design of Highway Tunnel Ventilation are obtained when the maximum slope section of the tunnel is located at the entrance and exit of the tunnel.Based on a certain project,the theoretical calculation results are compared with the numerical simulation results,and it is found that they are relatively close.