不同排烟方式隧道火灾烟气分布规律研究

The Research of the Distribution of Smoke in Tunnel Fires under Different Smoke Exhausting Modes

文章以浙江省某高速公路隧道为工程依托,搭建了隧道火灾实验平台,研究了纵向式和横向式排烟方式对火灾烟气浓度分布的影响。然后基于隧道火灾试验模型,建立了隧道火灾数值模型,将数值模拟结果与试验数据进行了比较,验证了隧道火灾数值模型的可靠性,分析了纵向式与横向式排烟方式下,隧道内CO浓度、温度的空间分布规律;根据结果得到了拱顶下方最高烟气温度与纵向通风风速及火灾规模的理论公式。

Based on a highway tunnel in Zhejiang Province,an experiment platform of fire in tunnel had been built in this paper.The influence of longitudinal and transverse smoke exhaustion modes on the distribution of fire smoke concentration was also studied.Then,based on the testing model,a numerical model of tunnel fire was established,and the results of numerical simulation were compared with the experimental data to verify the reliability of the numerical model.The spatial distribution of CO concentration and temperature in the tunnel under the longitudinal and transverse smoke exhaustion modes were analyzed,and the theoretical formulas for the maximum temperature of flue gas under the vault and the wind speed under longitudinal ventilation as well as the scale of the fire had also been obtained.