Numerical modelling of a line type heat detection system in tunnel fires

The electrical cable failure model was applied to simulate the response of FBG cables in tunnel fires. After a series of validation against the full scale tests in the Runehamar tunnel, two series of numerical simulations were conducted in two tunnels, to study the detection behaviors of a line type FBG heat detection system. The scenarios at different ventilation velocities using fire curves with different fire growth rates were investigated. The FBG cable measurement at the tunnel center and the side were compared and analyzed. For Tunnel A (5 m high and 10 m wide), there are relatively small differences in FBG temperature and rate of temperature rise between the center and the side cables, 9 % and 15 % respectively for a 1 MW fire. For Tunnel B (5 m high and 15 m wide), there are relatively small differences in FBG temperature (9 % for a 1 MW fire) but the difference in rate of temperature rise is as high as 25 % between the center and the side cables for 1 MW fire. Based on the numerical results, recommendations for the settings of FBG cables in tunnels of various cross sections are made. For Tunnel A, use of one cable along the tunnel center appears to be reasonable. For Tunnel B, two cables are recommended to increase the spatial resolution and sensitivity of the detection system.

• Record URL:
  • http://urn.kb.se/resolve?urn=urn:nbn:se:ri:diva-52982
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/9789189049895
• Corporate Authors:

  RISE Research Institutes of Sweden

  ,   Sweden 
• Authors:
  • Li, Ying Zhen
  • Jiang, Lei
  • Ingason, Haukur
• Conference:
  • Ninth International Symposium on Tunnel Safety and Security
  • Location: Munich , Germany
  • Date: 2020-3-11 to 2020-3-13
• Publication Date: 2020

Language

• English

Media Info

• Pagination: pp 373-388
• Monograph Title: Proceedings from the Ninth International Symposium on Tunnel Safety and Security, Munich, Germany, March 11-13, 2020

Subject/Index Terms

• TRT Terms: Calculation; Detection and identification; Fire; Heat; Simulation
• ITRD Terms: 6464: Calculation; 9115: Detection; 1624: Fire; 9157: Fire protection ; 6743: Heat; 9103: Simulation
• Subject Areas: I25: Design of Tunnels;

Filing Info

• Accession Number: 01845953
• Record Type: Publication
• Source Agency: Swedish National Road and Transport Research Institute (VTI)
• ISBN: 9789189049895
• Files: ITRD, VTI
• Created Date: May 20 2022 2:06PM