This paper studies the character of smoke by fire model test in tunnel, emphasizes on the law of smoke distribution, analyses the length, velocity and thickness of refluxed zone.

• 摘要通过对隧道火灾模型试验，研究隧道发生火灾时烟流性态，着重对隧道内的烟流扩散规律、烟流逆流层的长度、逆流速度、逆流层厚度进行了试验数据的分析。