公路隧道火灾通风数值模拟分析及逃生研究

A Research to Escape Based on Fire Ventilation Simulation Analysis in Highway Tunnel

利用数值模拟技术和pyrosim软件,对火灾功率为20 MW的中型规模隧道火灾进行了仿真,通过对火灾烟流蔓延模拟结果的分析,得出了该火灾规模的临界风速,并在临界风速下,通过对隧道内的温度、CO浓度的分布进行了数值模拟分析,得出了其分布规律。然后以修正后的克拉尼公式及FED窒息模型作为火灾时人员逃生的判定条件,综合考虑了火灾时隧道各断面温度和CO浓度分别与人员极限忍受时间的关系,最后得出隧道火灾时人员的安全逃生方向及火源下游人员的最大安全逃生时间和最远逃生区域。

In this paper, using the numerical simulation technology, and using pyrosim software for tunnel medium scale fire simulation whose power is 20MW, by analysising of the simulation results of the spread of fire smoke flow, then draw the critical wind speed of this fire, and under the critical wind speed, analysis of the numerical simulation on temperature, CO concentration distribution, and come to their distribution. Then with the modified formula, FED Suffocation model to escape discrimination condition, considering the temperature and CO concentration under the common action of personnel endure limit time relationship,finally draw the safety of the personnel escape direction and the maximum security escape time and the fasthset escape area at different locations of the fire origin downstream after tunnel fire.