Numerical simulation of smoke control modes in underground railway station fire

Puts forward a smoke control mode of applying smokepreventing air curtain substituting for ceiling screen and down air flow with velocity no lower than 1.5 m/s at the landing of stairs. Establishes a physical model of a twolayer underground railway station, simulates and compares four smoke control modes by CFD. The results indicate that more than 6 minutes for safe evacuation can be guaranteed by the smokeprevention air curtain and the quantity of fresh air is reduced compared with the conventional modes, therefore effectively prevents the fire expanding further and controls the smoke spreading.