Comparative Study of Carbone Monoxide and Temperature Vertical Distribution in Tunnel Fires

Tunnel fires are responsible for many fatalities in recent decades and this field of study has received an extensive effort by researchers, investigators, students and so forth. Removal of the generated plume and high temperature is the great interest of investigators. In the current study, a numerical test has been performed on a rectangular cross section tunnel with a pool fire at the middle part using FDS5.5. Obtained results were compared with previous results. Then vertical distributions of Carbone monoxide and temperature stratification are presented for various heat release rate of fires and various tunnel aspect ratios and inclinations which have been reported in dimensionless form using their maximum value beneath the ceiling. Results indicate that the vertical values of CO decay faster than temperature values. These profile also helps us to find out about thickness of the plume where one can be aware of smaller thickness for higher aspect ratio.