Side-platform Station Of Subway Tunnel Slide Type Platform With Partition And Without Partition Of Environmental Control Ventilation Effect Research

Piston wind induced by metro and train operation in tunnels is the main motivepower for ventilation and heat transfer. As for the factors influence the piston wind, theyare very many including the speed of the train, blockage ratio, operation means of theenvironment control system of metro, ventilating shaft and so on. This thesis mainlydiscusses two different kinds of platforms of metro, slide type platform with partitionand slide type platform without partition which has different effects upon piston wind,therefore it causes different results of ventilation and energy-conservation as well asdistribution of airflow field. In this paper, cut off side and side cut off the two forms ofthe Metro side platform to analyze the site in different forms piston wind has proposed amore rational side platform type, in order to achieve good ventilation and energyefficiency.The content of analyzing in this paper has a high importance to the metro operationin an energy-conservation way respectively in theory and practice. Besides the airflowin tunnels of train and metro stations and intervals is seen as three-dimensional,non-compressible and unstable turbulent flow to distribute governing equation usingstandard equation and finite volume method. This paper analyzes airflow fieldand piston wind in tunnels of two types of slide platforms of metro through dynamicmesh technique of three-dimensional CFD fluid calculation software. Firstly, it studiesthe distribution regularity about velocity field, pressure field and temperature field of airflow in tunnels of stations from accelerating of starting to constant velocity todeceleration period of metro operation. Moreover, it also studies the difference inventilation and energy-conservation between two slide type platforms. It turns out thatthe average temperature of horizontal transverse is a little bit low when trains enter andexit in slide type platform without partition. Secondly, it brings heavier piston windwhen the train is operating in slide type platform without partition. The wind is muchheavier when trains enter in slide type platform with partition than the one withoutpartition after having a specific analyzing of the wind and the temperature of airflow ofmetro stations and tunnels in different intervals.Finally, extra heat exhaust is easilyexhausted in the platform without partition on the basis of studying the pressure fieldand velocity field of air exit of rail head and foot when trains enter and exit andstudying the effect of heat exhaust in the platform as trains stop running.However, theairflow field around the platform with partition needs less time to keep stable.