CHARACTERISTIC OF PLUME BEHAVIOUR IN A SMALL SECTION ROAD TUNNEL ONLY FOR PASSENGER CARS

(A STUDY BY NUMERICAL SIMULATION)

Abstract

This paper describes an examination of plume behaviour in a small section tunnel by means of 3-dimensional simulation. We confirmed the validity of present simulator for small sectional tunnel in comparison to the 1/3 scaled model tunnel fire tests. The maximum heat(convection) and smoke release rate of a passenger car fire were derived 1.8MW and 9g/s respectively compared between simulation and experiment of passenger car fire in the tunnel. As a result of the simulation of the passenger car fire for a small section road tunnel, we clarified that the smoke transfer is not over 1m/s. However, the smoke is easy to diffuse by the large effect of temperature fall of the plume compared to ordinary cross section.