Numerical and experimental study on optimal running mode of smoke extraction system in a subway station in Beijing

Velocity fields on the platform area and flow rate of the smoke extraction system were experimentally measured under the different fan-operation modes in an actual subway station in Beijing. The velocity at the four tunnels connected with the station and velocity at the stairs between platform and concourses were obtained. Through simulation based on the measured results, the smoke velocity, temperature and concentration in case of station fire under the different fan-operation modes were analysed, and the optimal smoke extraction mode was proposed. Improved advices about the issues of the current extraction mode were put forward, to offer reference for the current running modes of the subway extraction system and the design of the future subway extraction system.