Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 08, 2024 - September 11, 2024
In previous reports, simulations are performed for a car tunnel fire using FDS+EVAC to estimate the amount of carbon monoxide inhaled by stationary people placed in the tunnel. The results shows that people near the side walls inhaled more carbon monoxide than people in the center. Since evacuees generally walk near the side walls and emergency exits are installed on the side walls, it is necessary to consider safety measures. Therefore, this report carefully observed the simulation data and investigated how carbon monoxide moves during a tunnel fire. In this report, the tunnel fire simulation is conducted using the same tunnel shape and fire source conditions as in previous reports, but the latest version of FDS6.9.1 is employed. In addition, in order to investigate the horizontal carbon monoxide concentration, the simulation conditions are set to output the carbon monoxide concentration distribution at different height cross sections. At heights of 1.0 m, 1.5 m, and 2.0 m, these are shown that the carbon monoxide concentration near the sidewall is higher than that near the centerline in the uphill direction near the fire source, but then there is an area where the concentration near the centerline is higher. Further to the uphill direction, the difference in concentration becomes smaller, but the concentration near the sidewall is again higher near the tunnel exit.
