Numerical Simulation On Ventilation Modes In Fire Of Subway Island-platform

With the economic and social development, and speed up of the process of urbanization, the urban population increased dramatically, resulting in a series of jams. Subway is seriously solving the problem of congestion of the city. Subway station belongs to underground or half-underground building, with internal space closed and narrow. Once on fire, temperature inside the station rose quickly, large heat accumulation inflicted a great threat to the safety of passengers for their escape. After the fire, subway smoke within the induction system can quickly sense the fire and smoke, and start exhaust system to control its smoke. Therefore, the study of internal subway smoke conditions become more focus for many scholars.This study of a subway station in Guangzhou City as the research object, designed the different intensity of fire and smoke conditions by using FDS software to simulate all kinds of these conditions, and be monitoring of staircases. This paper studies the changing rule of the temperature and CO concentrationetc. when there is a fireinthe subway platform. This paper compared simulation results in different conditions, analysis of each condition and the pros and cons of rationality, which could identify the best mode of ventilation and smoke under thedifferentfire intensities.Based on simulation results were analyzed and compared with them on the platform, if there are different smoke conditions, temperature, CO concentration and smoke effects are also different, when the fire happened; the fire intensity is different, with the smoke patterns are not the same.(1)When the source of fire located in the middle of the platform, it can affect II and III stairs, and compared with the other exhaust conditions,for the source of strength of the 5MW fire,the mode of 22 exhaust port can control the smoke spread more effectively, and more conductive to the human safety evacuation in metro station.For the source of strength of the 10 MW fire, the mode of 44 exhaust port can control the smoke spread more effectively, and more conductive to the human safety evacuation in subway station.(2)When the source of fire located in the end of the platform, it can affect I stairs, and compared with the other exhaust conditions, for the source of strength of the 5MW fire,the mode of 22 exhaust port can control the smoke spread more effectively, and more conductive to the human safety evacuation in metro station.For the source of strength of the 10 MW fire,the mode of 44 exhaust port can control the smoke spread more effectively, and more conductive to the human safety evacuation in subway station.