Study on Smoke Blocking Effect of Vertical Air Curtain

To reduce the harm caused by smoke spread in the event of a fire, this article proposes a vertical air curtain. The platform floor of an island style subway station is taken as research background, the impact of four types of air curtains on fire smoke control was investigated using FDS numerical simulation software, including upper air supply (US), downside air supply (DS), upper air supply and downside air exhaust (USDE), and downside air supply and upper air exhaust (DSUE), by analyzing the changes in visibility, CO concentration, and the temperature of smoke. The results show that the smoke control effect of the US air curtain and USDE air curtain are poor, because they cannot prevent the spread of smoke; The DS air curtain and the DSUE air curtain can effectively block the spread of smoke, among which the DSUE air curtain has the best smoke blocking effect. Within 360 s, it can ensure that the visibility at the height of the human eye in the protected area of the air curtain is maintained at 30 m, the CO concentration does not increase, and the maximum smoke temperature is 21 ℃. It proves that using the DSUE air curtain can ensure a safe evacuation time of more than 6 min for personnel, providing convenient conditions for personnel evacuation.