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Use of mobile fans during tunnel fires
RISE Research Institutes of Sweden, Safety and Transport, Fire and Safety.ORCID iD: 0000-0001-9468-4586
RISE Research Institutes of Sweden, Safety and Transport, Safety.ORCID iD: 0000-0002-9340-6768
2020 (English)In: Tunnelling and Underground Space Technology, ISSN 0886-7798, E-ISSN 1878-4364, Vol. 106, article id 103618Article in journal (Refereed) Published
Abstract [en]

Smoke control is a key issue in tunnel fire accidents. While jet fans have been widely used in road tunnels, mobile fans provide a good complement, due to its flexibility to operate, especially if there are no fixed jet fans present. To confirm the feasibility of a mobile fan system, full scale fire tests were conducted in Kalldal tunnel in Sweden, with fire size in the range of 1–2.6 MW and a mobile fan placed at the tunnel portal. In the tests, it takes about 4–5 min to establish full flow in the opposite direction and the final flow velocity can reach 1.5–1.9 m/s. To describe the transient behavior of flow development inside tunnel, a one-dimensional lumped theoretical model has been developed. The model takes into account the pressure losses of external wind, the stack effect of fire and friction losses over tunnel walls and two portals. The model is validated using the data from Kalldal tunnel fire tests. Results show that the model can well predict the initial and final steady state velocity, but underestimates the flow development. The model gives prediction on the safe side.

Place, publisher, year, edition, pages
Elsevier Ltd , 2020. Vol. 106, article id 103618
Keywords [en]
Flow development, Full-scale tests, Mobile fan, Theoretical model, Tunnel fire, Fire protection, Flow velocity, Smoke, Smoke abatement, Full scale fire test, Pressure loss, Smoke control, Steady-state velocity, Theoretical modeling, Transient behavior, Tunnel portals, Fires, fire management, numerical model, prediction, theoretical study, transient flow, tunnel, Sweden
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-48920DOI: 10.1016/j.tust.2020.103618Scopus ID: 2-s2.0-85091026936OAI: oai:DiVA.org:ri-48920DiVA, id: diva2:1476422
Note

Funding text 1: The work was funded by the Swedish Road Administration . Acknowledgements to B I G Germany who provided with the mobile fan and to RISE Tunnel and Underground Safety Centre (TUSC) for the financial support to the project.

Available from: 2020-10-14 Created: 2020-10-14 Last updated: 2023-05-17Bibliographically approved

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Jiang, LeiIngason, Haukur

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