Calculation of CO Behavior in the Platform for Deeply Underground Subway Station with Different Fire Strengths

초록

Effect of different fire strengths on the smoke distribution in the subway station is investigated. Shin-Gum-Ho station (line #5) in Seoul is selected as a case study for variation of CO (carbon monoxide) distribution caused by the fire in the platform. The ventilation in the station is set to be an air supply mod in the lobby and an air exhaustion mod in the platform. One-side main tunnel ventilation (7,000m³/min) is applied to operate in the tunnel. The fire is assumed to break out in the middle of train parked in the platform tunnel. Two kinds of fire strength are used. One is 10MW and the other is 20MW. Ventilation diffusers in the station are modeled as 317 square shapes & 4 rectangular shapes in the lobby and platform. The total of 7.5million grids are generated and whole domain is divided to 22 blocks for parallel computation. Large eddy simulation method is applied to solve the momentum equation. The behavior of CO is calculated according to different fire strengths and compared with each other.