Smoke exhaust mode for large subway transfer station platform

Taking a large subway transfer station as the research object,based on the ventilation system configuration of the station,two types of fire smoke exhaust mode for the platform were selected,which were the modes with and without operating tunnel exhaust fans.Using the computational fluid dynamics software FDS,a 3D model of the subway station was built with a fire located in the middle of the second floor.Large Eddy Simulation model was used to assess the effect of the mechanical smoke exhausting of the fire floor with the above exhaust modes.The analysis of the smoke spread,visibility and stair's velocity showed that opening the tunnel fans controlled the smoke spread and descending better and increased the stair's velocity,which was a more effective smoke control mode for the platform.