中文摘要：

公路隧道在给人们带来便利交通的同时，也给火灾防治带来了许多新的问题。本文以秦岭某长大单洞单向公路隧道作为研究对象，采用CFD方法对长大公路隧道发生火灾时烟流性态的发展过程进行了三维数值模拟，隧道计算区域全长200m，横截面面积65．37m^2，总宽度10．5m，总高度7．2m，火源中心位于距隧道进口100In处。文章针对公路隧道火灾在不同的通风工况下的浓度场和速度场分布规律展开研究，为科学地制定通风方案和防火救灾措施提供了参考依据。

英文摘要：

Highway tunnel afford convenient traffic to people, which also brought many new issues to the prevention of fire. This paper presents three-dimensional numerical simulation with the method of CDF to development of the form of hot current behavior when fired in the Long and Large highway tunnel, regarding the single-hole and one-way tunnel as a research object in Qinling. The computational domain of this tunnel is the 200 m in length, the 65.37 m2 in cross-sectional area, the 10.5 m in total width and the 7.2 m in total height. Fire center is located at 100m from the tunnel entrance. This research carries out the distribution of the concentration filed and velocity filed during the different condition of ventilation. It provides a reference for designing the plan of ventilation and the method of preventing fire scientifically.