Numercical Simulation Study Of Controllable-Vents On Metro Psd

In recent years, PSD is widely used to ensure operational safety by separating the tunnel and the station on the edge of the platform in constructing a new subway line or renewing the old line. Particularly,using of the whole closed screen door is the most common in the underground stations. PSD installed on Subway platform can be effective in reducing the impact of the piston wind on site, in order to avoid loss of cold air caused air convection.Particularly in the summer, which can better meet passenger's comfort requirements. But in the transitional season, it is undoubtedly a waste of energy if we rely entirely on the station's ventilation system to meet the station's environmental requirements,due to PSD effectively cut off theair flow between the tunnel and the sites.so how to effectively introduction of the piston air to enhance the station's ventilation during the transition season is considered in this paper, wchich is able to play a good role in energy-saving.In this paper,we presents the platform screen door system with a controllable-vents by combines the advantages of the with and without PSD system, which can both have the advantages of the traditional PSD,such as safe and comfortable, but also can flexible and efficient use of piston wind. We check the correctness of the physical model on the main object of Line No.2 of Xi'an Metro. The same time,we establish a physical model with a controllable outlet on PSD on the basis of analysising and identifing the location of the controlled outlet.As the proper boundary conditions is important for the numerical simulation, so all the piston wind parameters are obtained by the SES in this paper.Unsteady numerical simulation is adaptted,and analysis mainly cover two aspects:First, April is the focus of the object, we detailed analysis the emperature field and velocity distribution of each unit of the station in various operating conditions,such as two trains pull in and two trains pull out,one train pulls in meanwhile one train pulls out.And check the requirements of 5 air changes per hour in Metro specification which is guaranteed; Because the velocity boundaries are roughly the same in each month,so the distribution of the temperature field is analyzed in January and SeptemberWe can obtain the distributions of velocity field and the temperature field in each station units by simulation of various operating conditions and various stations, while check and point out that this new type of PSD system can effectively introduction the piston winds to fully meet the requirements.It can have a good energy-saving effect in the transition seasons, also which has laid a theoretical basis for practical engineering applications.