The Effects Of Sidewall Constraint On Temperature Distribution Of Fire-Induced Thermal Flow Under An Arc-Ceiling

A numerical study with varying transverse fire locations based on a semicircle tunnel model was carried out and it was used to further compare with the rectangular model in the published literature, aimed to investigate the influence of cross-sectional structure on temperature distribution under the ceiling. Results demonstrate that the reduction in temperature along the tunnel centerline under the flat ceiling is greater than that under the arc-ceiling. In addition, the influence of constraint effect of sidewall under the arc-ceiling is more significant than the flat ceiling because the flame would attach the ceiling when the fire is near the sidewall.