Study Of Ventilation And Somke Excluding In The Underground Station Of City Railway

China’s urbanization is currently in the process of rapid development, in the process of urbanization, the development of the original town or semi-urban areas to select the development of satellite towns is inevitable. City railway as an important part of the urbanization took the short intercity passenger transportation. City railway and subway operating capacity, operational capability, operational mode is also very different, these differences make the city railway and subway ventilation exhaust characteristics there is a big difference, not copy specification subway ventilation system. Requires a combination of its own characteristics deepen the study of ventilation exhaust system in order to optimize the design of ventilation systems, improving heat efficiency, while enhancing effects of fire smoke, reduce the risk of fire, creating favorable conditions for people to escape.In this paper, the use of CFD for the first three-dimensional dynamic mesh underground city railway station PSD system, combined with the city railway train models, grouping and grid density and other parameters set only track on the top row of hot air channel, set only the top row of hot air rail road, while set the bottom row under the top rail track rail line zone hot air channel three sites tunnel ventilation systems were studied thermal environment analysis, the track also features top rail bottom heat vent, when the train stops and stops average temperatures were40℃less, better ventilation; mouth only rail against the wind, the train stops at the bottom of the tunnel when the average temperature is34℃, the train stops at the top of the tunnel when the site an average temperature of32℃, can meet the requirements of the tunnel ventilation; only rail base outlet when the train stops during the top of the tunnel above the average temperature reaches40℃, unable to meet the tunnel ventilation requirements. With only the top row of hot air channel rail tunnel ventilation can meet the requirements, but also reduce the difficulty of the tunnel construction, is an ideal ventilation system.Three-dimensional CFD simulations and then just rail against the top row of hot air channel ventilation system vents use analysis of different forms, namely setting group2,4and7group outlet temperature heat distribution rail lines in the region, analysis of the three forms of outlet heat efficiency, draw heat vents set seven groups, tunnels average temperature of32.2℃, but only a small area of the outlet, and the quantity, set4or2sets of60m spacing heat ventilation requirements to achieve the same outlet, and the outlet location class car models without restrictions. Given that the exhaust outlet of the heat vents cater to fire when analyzed different fire conditions different heat settings for smoke outlet flow characteristics, the effect of temperature distribution and visibility, draw seven groups set up in the tunnel,4and2when the group of outlet spacing60m, visibility and temperature on escape routes to escape their staff can meet the requirements.