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Analysis of Muskö tunnel fire flows with automatic sprinkler activation
RISE - Research Institutes of Sweden, Safety and Transport, Safety. (Tunnel and Underground Safety Center)ORCID iD: 0000-0001-7744-2390
RISE - Research Institutes of Sweden, Safety and Transport, Safety. (Tunnel and Underground Safety Center)
2017 (English)Report (Other academic)
Abstract [en]

The focus of the present study is analyzing the best position of a sprinkler nozzle in a tunnel cross-section in the Muskö tunnel, south of Stockholm, Sweden. Activation of the sprinklers installed along the centerline and along the sidewall is investigated through analysis of full scale experiments and by three dimensional numerical modelling. Then the tunnel velocity is analyzed by one dimensional numerical modelling for various fire locations in the Muskö tunnel. For both activating the automatic sprinklers nearby the fire and avoiding activation of the sprinklers further downstream, the automatic sprinklers are recommended to be installed along the centerline of the tunnel. It has also been found that the tunnel velocity varies significantly with the fire location. When the fire is on the left side of the tunnel, the flow velocity mostly remains in a range of 1 m/s (positive or negative) within the first 10 minutes, which helps early activation of the automatic sprinklers. When the fire is on the right side of the tunnel, the flow velocity mostly remains within a range of -1 m/s and 1 m/s within the first 5 minutes, and the velocity mostly increases to 2 m/s at around 10 min. Therefore, the scenario for fire located on the left side is better than that for fire on the right side, especially when it is located between the middle of the right section and the right portal. As one typical case with fire on the right side, the tunnel velocity maintains at 1 m/s for the first 5 min and gradually increases to 2 m/s at 10 min. Under such conditions, the automatic sprinkler system is expected to perform well. 

Place, publisher, year, edition, pages
Borås, 2017. , 30 p.
Series
RISE Rapport, 2017:51
Keyword [en]
tunnel fire, tunnel velocity, automatic sprinkler, activation
National Category
Chemical Process Engineering Building Technologies Infrastructure Engineering Transport Systems and Logistics Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:ri:diva-32445ISBN: 978-91-88695-16-1 (electronic)OAI: oai:DiVA.org:ri-32445DiVA: diva2:1154655
Funder
Swedish Transport Administration
Note

The research work presented in this report has been sponsored by Tunnel and Underground Safety Center (TUSC) with additional funding from STA (Trafikverket). 

Available from: 2017-11-03 Created: 2017-11-03 Last updated: 2017-11-03Bibliographically approved

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Li, Ying Zhen
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CiteExportLink to record
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