Abstract: Article 3.1.1 （2） of Technical standard for smoke management systems in buildings stipulates strict requirements for the mechanical pressurized air supply outlet settings in the vestibule. In order to study the effect of different setting methods of pressurized air supply outlet on the wind speed of the vestibule doorway section and the smoke prevention, this paper took a single entrance independent vestibule which adopts pressurization air supply to prevent smoke as research project, PyroSim was used to simulate the wind speed of the vestibule doorway section and the smoke flow in the vestibule under different settings of pressurized air outlets locations, air supply angles and arrangements of outlets. The results show that the effect of smoke prevent in the vestibule is the best when the air supply outlet is set above the door of vestibule, followed by the location opposite the vestibule door. Setting the air supply angle to lead the air to the vestibule door will improve the smoke prevention effect. When the outlet is set opposite the vestibule door, the horizontal arrangement is better than the vertical arrangement.

Key words: vestibule, locations of outlet, air supply angles, arrangements of outlet, smoke prevent, numerical simulation