基于正交试验的隧道火灾影响因素研究

Study on Influencing Factors of Tunnel Fire Based on Orthogonal Test

为了探究通风风速、火源位置和火源功率等因素对隧道火灾的影响,通过正交试验法对隧道火灾工况进行设计,并利用FDS进行数值模拟。将模拟结果中的温度、CO浓度和能见度作为分析指标,研究3种因素对隧道火灾的影响效果。结果表明:隧道内烟气温度和能见度是影响人员疏散的重要因素,其中最危险的火灾工况为通风风速为2 m/s、火源功率为10 MW以及火源位置偏移3.5 m。此外,各因素间的相互作用能够导致相似的后果。正交试验分析发现各因素对隧道火灾的影响顺序依次为通风风速、火源功率、火源位置。

In order to explore the influence of ventilation wind speed,fire source position and fire source power on tunnel fire,the working condition of tunnel fire was designed by orthogonal test method,and the numerical simulation was carried out by FDS.The temperature,CO concentration and visibility in the simulation results were taken as the analysis indexes to study the effects of three factors on tunnel fire.The results show that the flue gas temperature and visibility in the tunnel are the important factors affecting personnel evacuation,and the tunnel fire is the most dangerous when the ventilation wind speed is 2 m/s,the fire source power is 10 MW,and the fire source position is shifted by 3.5 m.In addition,similar results can be achieved by the interaction of influencing factors.The orthogonal test analysis shows that the influence order of each factor on tunnel fire is ventilation wind speed,fire source power and fire source position.