The Effect of Piston Wind on Subway Station and Multi-factor Analysis

Research purposes: In order to analyze the influence of piston wind on the subway station under multi-factor, this paper takes the inlet air volume of the entrance and platform door as the main analysis object, and studies the influence of piston wind on the station by numerical simulation and theoretical analysis, including the opening area of platform door, the opening area of the piston wind valve, the driving cycle and the bypass. Research conclusions:(1) The inlet air volume first increases and then decreases with the increase of the driving cycle, while the inlet air volume of the platform door decreases with the increase of the driving cycle. (2) The effect of simply changing the opening area of platform door on enhancing piston wind on the station is limited. (3) In the mode of platform screen door single piston system, it is suggested to add a bypass. The switch of the bypass can be adjusted according to the needs, so as to control and make use of the piston wind effect on the ventilation of subway station. (4) The smaller the opening area of the piston wind valve, the greater the air volume at the entrance, and the greater the influence of the piston wind on the station. With the control of the opening area of the platform door and the opening area of the piston wind valve, the influence of the piston wind on the station can be well controlled. (5) From the results of variance analysis, it can be concluded that the area of piston air valve has the most significant influence on the entrance air volume, while the opening area of platform door has the most significant influence on the inlet air volume. (6) The research result can well guide the design of environmental control system and provide a theoretical basis for the control and utilization of piston wind. © 2020, Editorial Department of Journal of Railway Engineering Society. All right reserved.