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Control of thermal-driven smoke flow at stairways in a subway platform fire
RISE Research Institutes of Sweden, Safety and Transport, Safety Research. Chongqing University, China.
RISE Research Institutes of Sweden, Safety and Transport, Safety Research.ORCID iD: 0000-0001-7744-2390
RISE Research Institutes of Sweden, Safety and Transport, Safety Research.ORCID iD: 0000-0002-9340-6768
Chongqing University, China.
2021 (English)In: International journal of thermal sciences, ISSN 1290-0729, E-ISSN 1778-4166, Vol. 165, article id 106937Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Elsevier Masson s.r.l. , 2021. Vol. 165, article id 106937
Keywords [en]
Critical velocity, Smoke barriers, Stairway, Subway station, Thermal-driven smoke, Air, Air conditioning, Computational fluid dynamics, Fires, Smoke abatement, Subway stations, Velocity, Ventilation, Ventilation exhausts, Air-supply system, Critical velocities, Mechanical ventilation system, Power-law functions, Smoke barrier, Smoke exhaust systems, Smoke flows, Thermal driven, Ventilation systems, Smoke
National Category
Building Technologies
Identifiers
URN: urn:nbn:se:ri:diva-52636DOI: 10.1016/j.ijthermalsci.2021.106937Scopus ID: 2-s2.0-85102966083OAI: oai:DiVA.org:ri-52636DiVA, id: diva2:1540954
Note

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.

Available from: 2021-03-30 Created: 2021-03-30 Last updated: 2023-06-08Bibliographically approved

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Li, Ying ZhenIngason, Haukur

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