Study on The Influence of Piston Wind on Smoke Propagation in a Cross-typed Metro Transfer Station

Due to the buried structure of the cross subway transfer station, effect of piston wind in the station will influence fire smoke spread in underground platform. In this paper, large eddy simulation (LES) method is used to study the fire simulation in a cross-typed metro transfer station. Smoke diffusion, temperature and CO concentration distributions, wind speed at the stairway are predicted for different smoke control modes. Based on the on-site measurement results of piston wind at platform in a condition with non-stopping train, the influence of deep buried structure and piston wind effect on fire smoke spreading rule of underground platform is studied. Results show that the buried structure of transfer station affects the natural air supplement of the ground floor platform. The piston wind effect has an adverse effect on the air distribution in the fire. In addition, air supplement volume at stairway cannot meet the requirements of the standard of metro design.