Evaluation of critical velocity employed to prevent the backlayering of thermal fume during tunnel fires

Qian Wang, Nobuyoshi Kawabata, Takuji Ishikawa

Research output: Contribution to journalArticlepeer-review

Abstract

In this paper characteristics of backlayering of thermal fumes induced by emergency fires in tunnels is studied. The critical velocity used to prevent the thermal fume and smoke from backlayering upwind is firstly evaluated by this study using 3 dimensional LES turbulence model. Simulation result shows that under low heat release rate of fire, the critical velocity increases linearly when heat release rate increases, but this dependent relation will become weak under high heat release rate. Result also shows a supercritical velocity valued 2.5-2.7 m/s exists, which agrees to the conventional experimental studies.

Original languageEnglish
Pages (from-to)911-918
Number of pages8
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume67
Issue number656
DOIs
Publication statusPublished - 2001 Apr
Externally publishedYes

Keywords

  • Backlayering
  • Computational fluid dynamics
  • Critical velocity
  • Large eddy simulation
  • Thermal fume
  • Tunnel fire
  • Turbulent flow

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering

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