Investigation on Effect of Ceiling Vent Location on Fire Phenomena in Enclosure with Side and Ceiling Vents

Abstract

In this study, the effect of ceiling vent location on the fire phenomena in the enclosure with side and ceiling vents was numerically investigated. As the ceiling vent location, Case F, Case F-M, Case M, Case M-B, and Case B were tested, and their distances from the side vent to the center of each vent were 0.265, 0.525, 0.750, 0.975, and 1.235 m, respectively. Among these cases, Case M-B showed the lowest temperature distribution in the enclosure and smoke layer temperature, the thinnest smoke layer, and the highest mass flow rate of outflow through the ceiling vent. One of possible reasons for these results is owing to the fact that the behavior of fire plume is changed by the inflow through the side vent. As the visualization result of temperature distribution, to determine the ceiling vent location for the improvement of smoke ventilation performance, it can be important to predict the amount of fire plume inclination by inflow through the side vent and the height of inclined fire plume region. To predict the amount of fire plume inclination by inflow through the side vent, the previous correlations of flame angle were assessed, which under-estimated the fire plume inclination of present numerical simulation.