Abstract

Air curtains are used as an industrial tool to control heating and cooling, over time they have been found to be useful for controlling fire and dust. In this paper, the effect of air curtain on fire was investigated in two different positions (above the door in a horizontal mode and next to the door in a vertical mode). Examination of fire requires careful simulation of toxic species and heat transfer; therefore, the combustion model of flamelet generated manifold (FGM) is used to investigate all toxic species. However, in this study, toxic samples of CO and CO2 are studied. After verifying the combustion model, the vertical air curtain was studied in different heat release rate (HRR) of 62.9, 500, and 5000 kW and in different positions of the fuel bed. Having examined the vertical air curtain at different velocities and ventilation angles, it was observed that the vertical air curtain functioned poorly in under-ventilated case; for example, almost 13 out of 24 rooms in the building had highly dangerous conditions, although in the over-ventilated case, it controlled the fire. But, the horizontal air curtain played the role of a fire controller and kept the mass fraction of toxic species (CO and CO2) below 5 and 170 ppm in the whole building, respectively.

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