The Numerical Simulation Study On The Influence Of Platform Screen Doors On Smoke Spread In Subway Station Fire

In recent years,the subway as an important means of transport has been put into use in many large cities baseuse of it’s fast,convenient and save time.However,once the subway fire,its special lineament and a large number of high temperature flue gas is a serious threat to people’s life and property.When the subway fire,reasonable smoke control system can be effective for smoke,thus reducing the casualties.Platform door not only can be used to isolated tunnel and platform,if necessary,also can be used as a smoke exhaust port.Therefore,research in the effect of platform door’s open for smoke exhaust has a certain practical significance.In this paper,with the software of FLUENT,the simulation study was carried out to analyze the fire condition with the five kinds of fire intensity of 5 WM occurred at the island-platform station in Shenzhen.With the model of the original ventilation system with platform as the exhaust port,the influences of different open modes of platform screen doors on smoke speed,temperature,concentration and speed of fresh air were analyzed;And the each conditions of temperature and concentration of flue gas distribution in the fire characteristics of transverse and longitudinal center line of the human eye height be compared,to get the best working condition and provide safe escape routes for personnel,The results show that:(1)With the model of the original ventilation system with platform as the exhaust port,after subway platform on fire six min,platform screen door as smoke exhaust port can ensure the temperature of stairs is under 452K,the speed of stain more than 1.5m/s;(2)Make a comparison between platform screen door open and closed at spread of flue gas,platform screen doors open can pumping platform flue gas to tunnel,effectively exhaust smoke,increase the platform security sapce for people’s evacuation;(3)The security area with open one quarter and bilateral 1/4 shielding door is bigger than open unilateral 1/2 and 1/2 way shielding door on both sides,namely with the rather distant place platform screen doors open will increase the spread of the flue gas range;the security area with open unilateral one quarter and 1/2 shielding door is bigger than open one quarter and 1/2 shielding door on both sides,namely open one door’s is better than open both sides on the effect of exhaust smoke;(4)To analy the influences of different open modes of platform screen doors on temperature and concentration,the optimization condition is open the seven platform screen doors,because under this condition the smoke exhaust effect is best,the safety area is biggest,and the economic loss is minimum.