Vent Location Impacts on Building Compartment Fire under Natural Roof Ventilation

Numerical studies on impacts of vent location on building compartment fires under natural roof ventilation were conducted. The results indicated that there was no significant difference of the smoke filling among compartment fires with different vent locations. For compartment fire with a vent at the ceiling center, the oxygen concentration was much larger, and the gas temperature was lower. The pressure difference of the center vented compartment fire was larger than that of the corner vented fire, and the mass flow rate into the compartment was larger than out of the compartment from the perspective of the whole burning stage. For the two scenarios, the mass flow rates of the center vented compartment fire were much larger than that of the corner vented compartment fire. Cares should be taken when use the model for fires directly under the ceiling vent.