隧道火灾机械通风临界风速研究

A Research on Critical Velocity of an Air Circulation in a Tunnel Fire

由于隧道的半封闭性,空间有限,当长度很长时空气流通不畅,一旦发生火灾,烟气就会迅速填充隧道,而且CO等危险气体也会随烟气向隧道扩散,这对隧道内车辆和人员造成极大的危险。因此,需要保证隧道内空气流通状态的良好以及发生火灾时对烟气的良好控制。模拟了隧道口附近发生一定功率火灾的情况下,控制烟气层流动所需要的临界风速。

Due to the semi-closed property and narrow space,thin air circulation occurs in a tunnel that is too long.If a fire takes place,a tunnel of this kind would be soon filled with smokes and other toxic gases,for example,carbon monoxide would diffuse through the tunnel as smokes spread,endangering the life of the people and cars in it.Consequently,it is important to ensure favorable air circulation in a tunnel and an effective control of smokes flowing when a fire happens.This paper constructs a model that a fire takes place near the entrance of a tunnel,and discusses the critical velocity needed to control the flow of smoke layers.