顶棚烟道对隧道火灾烟流场和温度场影响的分析

基于一种顶棚设有烟道的新型隧道结构，采用FDS软件，对该隧道内发生火灾时的烟气蔓延和温度分布进行模拟分析，并与常规隧道进行比较。结果表明：烟道的设置降低了人员逃生的相对长度，但使得位于火源点2端烟道口内外侧的隧道顶部烟气浓度均有所增高；烟道口处设有一定的排风时，可加速烟气进入烟道从而排出的速度，使得2端烟道口外侧的烟气浓度和温度大大降低，提高了人员逃生的安全系数，也使得火灾发生时消防人员可从上、下游两个方向对火灾进行扑救。该种隧道结构为人员逃生、消防人员对火灾的扑救、隧道结构的维护提供了一种新的方式。

Analysis on smoke and temperature pervasion in the tunnel with flue under fire

Based on a new type of tunnel configuration model with a flue on the top of it, the paper simulated the smoke pervasion when fire happens in the tunnel by FDS. The result shows that the setting up of the flue outlet reduces the distance of people fleeing. But under this condition the fire smoke density inside and outside of the two flue outlet will increase. The exhaust velocity designed at smoking outlet can accelerate the move of the smoke, and makes the fire smoke density outside of the flue outlet reduced greatly. This situation will offer an relatively safe space for people fleeing, and fire rescuing can also be carried out from two directions. This type of tunnel configuration give a new reference mode for the flee of the personnel, fire rescuing and the maintenance of the tunnel.