Numerical Research On Environment Of Platform Area Influenced By Subway Platform Screen Doors

With rapid development of subway construction,the thermal environment inside subway station has been paid more and more attention.At present platform screen doors are applied in most of subway stations in China,in order to reduce the energy consumption and lessen the impact of the tunnel piston wind on the platform.However,the platform screen door system is also an important factor affecting station thermal environment.Although the platform screen door prevents station thermal environment from tunnel,air leakage caused by door still has an effect on platform environment,especially when door is open,accompanied with air exchange,heat transfer from tunnel to platform,increase of air conditioning load.It is noted that there is no uniform standard for air leakage of platform screen door in China.This research aims to provide suggestions and theoretical basis for the reasonable design of platform screen door and calculation of air conditioning loadIn this paper,I take Labor Station of the first line of Xi’an subway as prototype and set up a three-dimensional CFD geometry model.Then compare and analyze air distribution in platform area under two circumstances:open and closed platform screen door,considering the impact of air leakage on people during waiting.The air leakage volume at different stages of train movement,entering station,stop at station and leaving station is analyzed.The variation of the velocity field of the platform and the leakage of door during train stop are studied emphatically.The velocity field of the waiting area under different conditions is presented,and their difference is analyzed Meanwhile,the law of leakage air flow rate fluctuating of platform screen door is discussed.And the velocity field variation of the whole platform during the train stop is compared and analyzedWith calculation of leakage flow rate,the change of air conditioning load caused by platform screen door is obtained.This study provides a theoretical basis for the reasonable operation and management of the subway platform screen door system as well as improvement of subway thermal environment.