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为探讨纵向通风情况下坡度隧道火灾烟气的温度分布、回流长度等特性参数,运用火灾动力学模拟软件FDS建立一个长为500 m的公路隧道模型,对不同坡度、不同纵向通风速率的20组火灾工况进行模拟研究,通过分析各工况的模拟结果,并结合前人在隧道火灾烟气特性研究方面的成果,得到火灾情况下隧道内烟气的纵向温度分布规律、隧道拱顶温度变化规律、温度偏移及烟气回流长度变化规律等。
In order to discuss the characteristic parameters of temperature distribution and reflux length of flue gas in tunnel with longitudinal ventilation, a model of highway tunnel with a length of 500 m was established by using fire dynamic simulation software FDS. Twenty groups with different vertical ventilation rates Fire conditions were simulated. Through analyzing the simulation results of each working condition and combining with the predecessors’ achievements in the study of flue gas characteristics of tunnel fires, the longitudinal temperature distribution of flue gas in tunnels was obtained. The variation of tunnel dome temperature Law, temperature deviation and flue gas backflow length change law.