Influence of Piston Wind on Platform Air Change When Platform Screen Doors Open in Subway

When the train entered the station with Platform Screen Doors (PSD), the Platform Screen Doors will open as soon as the train stop and the air will enter or exit from platform to tunnel due to the train motion at same time. This air change will augment the air-conditioner load of platform. So it is very important for designer to know the air change between platform and tunnel for designing the HVAC system of platform. But till now, there is no good method to apply to predict the air change accurately. In this paper, field test and 3-D CFD analysis using the commercial code FLUENT were applied to study the air change from the Platform Screen Doors. The mowing mesh technology was applied to realize the motion of the train. And with creating the interface between platform and tunnel, the Platform Screen Doors opened automatically was realized. Through comparing the results of measurement and numerical simulation, the air change volume was determined through the Platform Screen Doors, with is a good reference to HVAC design of platform.