K-1034 Backlayering Velocity of the Thermal Plume Induced by Tunnel Fires

Abstract

It is important to clarify the basic characteristics, such as backlayering distance and velocity of the thermal plume generated by the fire accident in a road tunnel in order to design the ventilation system for securing the evacuate environment. In this research, the backlayering velocity and distance are investigated by the experiments which use a reduced scale model tunnel and by the large eddy simulation. The reliability of numerical code is verified by compareing numerical and experimental results. The results show that the backlayering velocity increases with increasing the heat release rate and that the backlayering velocity and distance decrease with increasing the ventilation velocity.