文档介绍：中庭式地铁车站站台火灾烟气扩散控制模式的数值模拟分析
 
   
 
 
 
 
 
 
 
     
 
 
 
 
 
摘 要:中庭式地铁车站在火灾工况下的排烟模式设计是地铁车站设计中的难题。本文针对中庭式地铁车站站台火灾情况，采用大涡模拟的方法进行三维数值模拟，分别研究了两种火源位置下的烟气流动规律、不同排烟模式下的烟尘浓度分布以及CO浓度随时间的变化。结果表明：当火灾发生在站台中庭位置时，烟气受热浮力驱动直接扩散至站厅层并向四周蔓延，关闭站台层送风系统可以延缓烟气扩散到出入口的时间并抑制烟气层下降速度；而当火灾发生在站台廊道位置时，开启站厅层送风系统可有效提高站台烟气层高度并且阻止烟气蔓延至站厅层。
关键词:中庭式地铁车站；站台火灾；FDS；数值模拟；排烟模式
Abstract Smoke extraction mode in fire accidents is always a challenge during design of atrium metro stations. In this paper, according to the situation of atrium metro station platform fire, Large Eddy Simulation was performed to study smoke movement pattern, dust concentration distribution in different smoke extraction mode and how the concentration of the co changes with time under two different fire locations. The results show that if the platform atrium is on fire, buoyancy driven smoke spreads to the subway hall directly and then spread around, it will delay the time for the smoke spreading to passageway and slow the descending of smoke layer to close the air supply system of the platform layer. When fire takes place at platform corridors, operating the air supply system can raise smoke layer height and prevent the smoke spreading to the subway hall.
Keywords atrium metro station, platform fire accident, FDS, numerical simulation, smoke extraction mode
1 引言
随着我国经济的高速发展，地铁日渐成为城市中不可或缺的现代化交通工具；然而随着地铁的大规模建设，地铁火灾、水灾、毒物