Taking DYL typical island station of Hohhot Metro Line 1 in severe cold region as the research object,the computational fluid dynamics software Fluent was used to simulate the change rule of piston ventilation characteristics over time and the overall ventilation of the station under the coupling effect of mechanical ventilation system and piston effect.The results show that the mechanical ventilation system has a stronger influence on the piston ventilation volume of the station floor than that of the platform floor.The running of the mechanical ventilation system has no obvious influence on the change of the instantaneous piston ventilation volume of the station,but it will increase with the decrease of the piston ventilation volume.The track heat removal system has a significant limiting effect on the piston air volume sent into the station hall during the train entering and stopping,and also increase the fresh air volume brought into the station hall by personnel entrances and exits when the train leaves the station.During the operation of the ventilation system of subway stations in severe cold region,in spring,summer and autumn,the train departure piston effect will be fully utilized to introduce fresh air for improving the air quality inside the stations.
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