不同地铁车站吊顶形式对火灾烟气扩散的影响

针对实吊顶以及镂空率格栅吊顶装修形式的典型地铁车站站厅,采用大涡模拟的方法计算出不同镂空率吊顶在不同火源功率下的烟气层高度,分析评估镂空吊顶对烟气层沉降和温度分布。研究结果表明，火灾发生360 s内，格栅吊顶的蓄烟作用有助于将烟气层维持在安全高度，且随着镂空率增加维持烟气层在安全高度的效果越明显。但是镂空吊顶上方由于烟气温度较高，容易对吊顶内的各类设备产生危害。

Influence of different forms of suspended ceiling on smoke diffusion of fire in a subway station

Aiming at the typical hall of subway station with decoration forms of solid ceiling and grid ceiling, the smoke layer heights of ceilings with different hollow rate under different fire source power were calculated by using the large eddy simulation method, and the influence of hollow ceiling on smoke layer settlement and temperature distribution. The results showed that in a time period of 360 s after the occurrence of fire, the smoke storage effect of grid ceiling contributed to keep the smoke layer in a safe height, and the effect was more obvious with the increase of hollow rate. However, the equipments upon the ceiling may be damaged by the accumulated high temperature smoke.