Control of thermal-driven smoke flow at stairways in a subway platform fire

Funding details: China Scholarship Council, CSC; Funding text 1: The present work was financially supported by the Tunnel and Underground Safety Center (TUSC), which is greatly acknowledged. The first author would also like to thank China Scholarship Council for providing the opportunity to study at RISE.
To manage thermal-driven smoke from fires in a subway station, a mechanical ventilation system is usually installed. Such a system normally consists of an air supply system and a smoke exhaust system. In case of a platform fire, the ventilation systems will be activated to control the smoke and to provide better environmental conditions for personnel evacuation. This paper conducted a theoretical analysis and a series of CFD simulations to study the critical velocity (minimum air velocity) at the stairways for preventing smoke propagating from the platform to the upper floor through the stairways in case of a platform fire. Correlations for critical velocities are established for two typical types of stairways (i.e., with and without side slabs). It is found that the critical velocity is well correlated with the heat release rate by a 1/3 power law function for both types of stairways, but it varies with the height of the smoke curtain at the stairway by a 1.375 and a 2.55 power law function for stairways with and without side slabs, respectively. The results may serve as a useful reference for smoke control in subway platform fires.

Ingår i:International journal of thermal sciences: Elsevier Masson s.r.l.1651290-07291778-4166

Av författaren/redakt...: Liu, Yongqiang; Li, Ying Zhen; Ingason, Haukur; Liu, Fang

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