Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Influence of tunnel slope on smoke control
RISE - Research Institutes of Sweden (2017-2019), Safety and Transport, Safety.ORCID iD: 0000-0001-7744-2390
RISE - Research Institutes of Sweden (2017-2019), Safety and Transport, Safety.ORCID iD: 0000-0002-9340-6768
RISE - Research Institutes of Sweden (2017-2019), Safety and Transport, Safety.ORCID iD: 0000-0001-9468-4586
2018 (English)Report (Other academic)
Abstract [en]

The critical velocity and backlayering length in sloped tunnels are investigated by numerical simulations using FDS. Simulation in two full-scale tunnels, with negative slopes ranging up to -18 % and heat release rates from 5 to 100 MW were carried out.

The results show that NFPA 502 equation significantly overestimates the effect of negative slopes.

The equation proposed by Atkinson and Wu is found to be in closer agreement with the results. A simplified correlation, i.e. Eq. (12), is proposed and recommended for practical use.

The previous correlation for dimensionless backlayering length, Eq. (3), is valid for tunnels of various slopes and aspect ratios, and can be used for prediction of backlayering length.

Place, publisher, year, edition, pages
2018. , p. 22
Series
RISE Rapport ; 2018:50
Keywords [en]
critical velocity, tunnels, sloped tunnel, FDS
National Category
Mechanical Engineering Fluid Mechanics and Acoustics Applied Mechanics
Identifiers
URN: urn:nbn:se:ri:diva-36626ISBN: 978-91-88695-92-5 (electronic)OAI: oai:DiVA.org:ri-36626DiVA, id: diva2:1270845
Note

In the previous version there were misprints that have been corrected in the present version. The report/full text has been updated 2019-04-23 according to following corrections:

Equation (8) was given for two equations. The equation number sequence after Equation (8) has been corrected as well as references in text and graphs (2,4 and 6) to the corresponding equations.

In the previous version, Equations (8) on page 9, Equation (9) on page 11, Equation (10) on page 12 and Equation (13) on page 15 there was a misprint in the exponents for the boundaries given; a negative sign has been changed to positive sign in these equations.

Available from: 2018-12-14 Created: 2018-12-14 Last updated: 2023-06-08Bibliographically approved

Open Access in DiVA

fulltext(859 kB)405 downloads
File information
File name FULLTEXT02.pdfFile size 859 kBChecksum SHA-512
258f593dad221567ebe037bbcc5f59700dc4955856bc972d91316bf4c1d258382d3222aaec570d6c5dcce2a19a042b0ba9bb63375b0582151224feba981a2473
Type fulltextMimetype application/pdf

Authority records

Li, Ying ZhenIngason, HaukurJiang, Lei

Search in DiVA

By author/editor
Li, Ying ZhenIngason, HaukurJiang, Lei
By organisation
Safety
Mechanical EngineeringFluid Mechanics and AcousticsApplied Mechanics

Search outside of DiVA

GoogleGoogle Scholar
Total: 437 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 540 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf