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为研究动态火源对隧道拱顶温度场分布影响规律,针对隧道中动态火源火灾,在自然通风条件下,静止、40及60km/h等速度的20MW火源在隧道内穿行的火灾过程,采用火灾动力学模拟器(FDS)进行火灾场景的模拟与计算。重点对火源在隧道行进过程中拱顶沿纵向温度分布、温度峰值变化规律及影响因素进行分析。研究结果表明,通风是影响隧道火灾温度的主要因素,移动火源在一定程度上打破了隧道内由于顶棚射流引起的热烟气与冷空气的动态循环机制,活塞风尾段涡流会引起隧道流场变化,一定程度阻碍了燃烧释放热量向火源行进逆向的扩散,并将高温气流带向其运动方向。
In order to study the influence of dynamic ignition sources on the distribution of temperature field in the tunnel vault, aiming at the dynamic fire source fire in the tunnel, the fire course of static 20MW sources, such as 40 and 60km / h, traveling in the tunnel under natural ventilation, Simulation and calculation of fire scene with Fire Dynamics Simulator (FDS). Focus on the source of fire in the tunnel along the longitudinal distribution of the dome along the temperature, the peak temperature changes and influencing factors were analyzed. The results show that ventilation is the main factor affecting the tunnel fire temperature. The moving source of fire breaks to some extent the dynamic circulation mechanism of hot flue gas and cold air in the tunnel due to the roof jet, and the vortex in the tail of the piston will cause the tunnel flow Field changes, to a certain extent, hinder the combustion of heat released to the reverse propagation of heat, and the high-temperature airflow to its direction of motion.