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

Qian Wang; Nobuyoshi Kawabata; Takuji Ishikawa

doi:10.1299/kikaib.67.911

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 journal › Article › peer-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 language	English
Pages (from-to)	911-918
Number of pages	8
Journal	Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume	67
Issue number	656
DOIs	https://doi.org/10.1299/kikaib.67.911
Publication status	Published - 2001 Apr
Externally published	Yes

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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10.1299/kikaib.67.911

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Evaluation of critical velocity employed to prevent the backlayering of thermal fume during tunnel fires. / Wang, Qian; Kawabata, Nobuyoshi; Ishikawa, Takuji.

In: Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, Vol. 67, No. 656, 04.2001, p. 911-918.

Research output: Contribution to journal › Article › peer-review

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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.",

keywords = "Backlayering, Computational fluid dynamics, Critical velocity, Large eddy simulation, Thermal fume, Tunnel fire, Turbulent flow",

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