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为提高特长公路隧道火灾事故的防灾救援水平本文依托昭会高速公路大口子隧道为依托,利用FDS软件建立了隧道火灾三维数值计算模型,研究火灾工况时,不同纵向风速下,隧道内CO浓度的分布规律。结果表明:火灾规模与纵向风速对火灾时隧道内温CO浓度的分布及扩散范围影响明显;火区附近CO浓度较低,火区下游侧CO浓度随着距火源距离的增大而增加;随着纵向风速的增加,火区下游侧CO浓度稳定时间减小,CO浓度最大值减小;纵向风速为3m/s时,机械通风能有效降低隧道内CO浓度。
In order to improve the level of disaster prevention and rescue for fire accidents of highway tunnels, this paper builds a three-dimensional numerical model of tunnel fire with FDS software, relying on the tunnel of Zhaogou Expressway. The distribution of concentration. The results show that the scale and longitudinal wind speed of fire have a significant influence on the distribution and diffusion range of CO concentrations in the tunnel when the fire is caused. The concentration of CO in the fire area is lower and the concentration of CO on the downstream side of the fire area increases with the distance from the fire source. With the increase of longitudinal wind speed, the stabilization time of the CO concentration on the downstream side of the fire area decreases and the maximum CO concentration decreases. When the longitudinal wind speed is 3m / s, the mechanical ventilation can effectively reduce the CO concentration in the tunnel.