集中防烟模式下特长铁路隧道救援站火灾烟气控制数值模拟分析

Numerical Simulation of Fire Smoke Control at Extraordinary Long Tunnel in Smoke Centralized Mode

采用三种方法对集中防烟模式下,避难室及横通道的加压送风量进行理论计算,获得对应的加压送风量分别为140m3/s、200m3/s、240m3/s,针对三种工况送风量,在集中防烟模式下,分析当安全隧道送风风机关闭和开启时救援站火灾烟气控制效果,探讨集中防烟模式下火灾烟气控制的关键参数。研究结果表明,集中防烟模式下加压送风量大于140m3/s即可,集中送风量的变化对救援站内温度、能见度及CO浓度等参数分布影响不大;安全隧道辅助送风有利于救援站避难室防烟,各横通道入口处的风速随着安全隧道送风风速的增大而增大。

Use three methods to calculate the pressurized air supply volume of refuge chamber and across channel under centralized smoke prevention mode, the corresponding calculated pressurized air volume of three methods was 140m3/s, 200m3/s, 240m3/s. Based on the calculated air volume by three different methods, analyze the fire smoke control effect of rescue station when the air supply fan closed or open to obtain the key parameters of fire smoke control under centralized smoke prevention mode Results show that the fire smoke control effect is acceptable when pressurized air supply volume is more than 140 m3/s, the variation of centralized air supply volume has little impact on the parameters such as temperature, visibility, and CO concentration distribution of rescue station. Auxiliary air supply for security tunnel is advantageous to the smoke control of refuge chamber in the rescue station. The air velocity at the entrance of the cross channel increases with the increase of air supply velocity of safety tunnel.