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为研究纵向通风对隧道初期火灾定位的影响,提高灭火成功率,以秦岭终南山特长高速公路隧道为原型,通过试验研究在隧道入口一定距离处发生汽车火灾并引起入口段堵车情况下,风速及火灾增长系数对隧道中轴顶部最高温度的影响。结果表明:火灾试验中着火点与距隧道入口的设置距离至少大于隧道截面50倍当量直径才能避免入口段气流的影响;通过数据拟合发现,纵向通风将造成火灾时隧道顶部最高温度点向着火点下游运动,偏移距离与风速间呈较强线性关系,并得出预测隧道顶部最高温度达到某一数值所需时间以及该温度点向着火点下游水平偏移距离关系式。
In order to study the influence of longitudinal ventilation on the initial fire location in tunnels and to improve the success rate of fire extinguishing, a prototype of Qinling Zhongnanshan Expressway Tunnel was used as a prototype to study the effect of longitudinal ventilation on the tunnels at a certain distance from the tunnel entrance. Effect of Fire Growth Coefficient on Maximum Top Temperature of Middle Axis in Tunnel. The results show that the ignition point in the fire test and the distance from the entrance to the tunnel are at least 50 times the equivalent diameter of the tunnel section to avoid the influence of the inlet section airflow. The data fitting shows that the longitudinal ventilation will cause the maximum temperature at the top of the tunnel towards the fire downstream The relationship between movement, offset distance and wind speed is linear and the relationship between the time required to predict the maximum temperature at the top of the tunnel and the horizontal offset distance from the temperature point to the downstream of the fire point is obtained.