ANALYSIS AND OPTIMIZATION OF VENTILATION MODE OF SMOKE CONTROL SYSTEM IN SUBWAY STATION FIRES

In the subway station fires, the most immediate thr at to passengers’ life is not the direct exposure to fire, but the smoke inhalation because it contains hot ai r and toxic gases. Theoretical analysis and CFD simulations are applied to analyze the various poss ible ventilation model and obtain the optimization f ventilation mode in the subway station fires. Accor ding to the structure characters of the subway stat ion nd the mechanics analysis of smoke flowing, the air cu rtain is put forward to control the smoke diffusion according to the streamline and flux principle. The computational mathematical model of the air curtai n is derived theoretically. The results indicate that mo re than 6 minutes for safe evacuation can be guaran teed by air curtain. The quantity of fresh air that the air curtain needs has been only 2/5 of which the tr aditional method, which effectively prevent the fire expand a control the smoke diffusion.