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Re-direction of smoke flow in inclined tunnel fires
RISE - Research Institutes of Sweden, Safety and Transport, Safety. Chongqing University, China.
RISE - Research Institutes of Sweden, Safety and Transport, Safety.ORCID iD: 0000-0001-7744-2390
RISE - Research Institutes of Sweden, Safety and Transport, Safety.ORCID iD: 0000-0002-9598-0958
RISE - Research Institutes of Sweden, Safety and Transport, Safety.ORCID iD: 0000-0002-9340-6768
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2019 (English)In: Tunnelling and Underground Space Technology, ISSN 0886-7798, E-ISSN 1878-4364, Vol. 86, p. 113-127Article in journal (Refereed) Published
Abstract [en]

The re-direction of smoke flow in inclined tunnel fires refers to the phenomenon that the smoke flow direction suddenly changes due to the changes of thermal buoyancy or outside pressure or the activation of fans. This poses special risk for fire rescue services fighting fires in tunnels. Both small-scale tunnel fire tests (28 scenarios) and numerical simulations of full-scale tunnel fires (31 scenarios) were conducted to study this special phenomenon. A one-dimensional model was used to predict the flow velocity in the inclined tunnels, based on two different methods for calculating the mean smoke temperature (Method I and Method II, respectively). Results show that the smoke flow direction could be well predicted by the model with Method II. When the ventilation velocity is relatively large and the flow tends to be one dimensional, both methods produce similar results. Further, the influences of important factors on the re-direction of smoke flows were systematically analyzed. These factors include heat release rate, tunnel slope, tunnel length, friction factor, tunnel cross sectional area and fire source location.

Place, publisher, year, edition, pages
2019. Vol. 86, p. 113-127
Keywords [en]
Re-direction, Slope, Smoke movement, Tunnel fires
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-37695DOI: 10.1016/j.tust.2019.01.006Scopus ID: 2-s2.0-85060335729OAI: oai:DiVA.org:ri-37695DiVA, id: diva2:1284855
Note

 Funding details: China Scholarship Council, CSC; Funding text 1: The authors would like to acknowledge Tunnel and Underground Safety Center (TUSC) for the financial support to the study. Shengzhong Zhao was also financially supported by China Scholarship Council under Program for Ph.D Student Overseas Study Scholarship 2017. The authors would also like to acknowledge Eva-Sara Carlson and Anna Gidlöv for the help during the model scale tests.

Available from: 2019-02-01 Created: 2019-02-01 Last updated: 2019-02-01Bibliographically approved

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Li, Ying ZhenKumm, MiaIngason, Haukur

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