Abstract: The Fluent software is used to establish the motion fire model of the tank truck in the tunnel and the numerical simulation was made. The temperature distribution and smoke spread law of the tank truck in the tunnel after fire are mainly studied under different driving speeds. The results show that when the driving speed is low, the ceiling jet will be formed in the tunnel, the diffusion speed of the plume to the front of the movement is faster and the temperature is higher, the influence range of the high temperature zone, the smoke concentration and the distribution range are also larger. With the increase of speed, the position of the ceiling jet is also closer to the front of the movement, the ceiling jet is difficult to form, and the vortex mass flow is formed behind the tank truck. The influence range of the high temperature zone is also gradually reduced as to the wind flow, and the smoke concentration changes sharply at a certain position behind the tank truck.

Key words: tunnel, oil tank fire, numerical simulation, temperature distribution, smoke spread