Journal ArticleDOI
A computational study on effects of fire location on smoke movement in a road tunnel
Feng Wang,Mingnian Wang +1 more
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TLDR
In this article, a numerical model of tunnel fire is developed and aimed to investigate the influence of cross-sectional fire locations on critical velocity and smoke flow characteristic, and it is shown that the critical velocity for a fire next to the wall is obviously higher than that of a fire in the middle or on the left/right lane.About:
This article is published in Tunnelling and Underground Space Technology.The article was published on 2016-01-01. It has received 58 citations till now. The article focuses on the topics: Critical ionization velocity.read more
Citations
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Review of the flame retardancy on highway tunnel asphalt pavement
TL;DR: A review of the flame retardancy on highway tunnel asphalt pavement is presented in this article, where the combustion of asphalt pavement and cement pavement is compared on the basis of highway tunnel fire, the commonly used asphalt flame-retardant evaluation standards are analyzed.
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Experimental study on maximum smoke temperature beneath the ceiling induced by carriage fire in a tunnel with ceiling smoke extraction
TL;DR: In this article, a series of small scale experiments are conducted in a model tunnel, consisting of a carriage (with an opening) in a tunnel, and the maximum temperature is measured, and shows different development trends with increasing ceiling smoke extraction rate.
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Numerical study on fire smoke movement and control in curved road tunnels
TL;DR: In this article, the authors present numerical results for critical ventilation velocity and smoke movement for fires in different transverse positions in curved tunnels, and three regimes of back-layering length are concluded for the transverse fire locations in this paper.
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Numerical Investigation of Back-Layering Length and Critical Velocity in Curved Subway Tunnels with Different Turning Radius
TL;DR: In this paper, a series of curved subway tunnels with turning radius of 300-1000m were investigated numerically by FDS 5.5 in terms of the smoke back-layering length and critical ventilation velocity under the heat release rate of 5-10MW.
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Characterization of ceiling smoke temperature profile and maximum temperature rise induced by double fires in a natural ventilation tunnel
TL;DR: In this article, the authors studied the ceiling smoke temperature distribution characteristics of double fire sources in a natural ventilation tunnel and developed a model of K considering the burner separation distance and dimensionless heat release rate.
References
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Journal ArticleDOI
Control of smoke flow in tunnel fires using longitudinal ventilation systems - a study of the critical velocity
TL;DR: In this article, a series of experimental tests in five model tunnels having the same height but different cross-sectional geometry were carried out and the experimental results showed that the critical velocity did vary with the tunnel crosssectional geometry and that there are two regimes of variation of critical velocity against fire heat release rate.
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Control of smoke flow in tunnel fires
Yasushi Oka,Graham T. Atkinson +1 more
TL;DR: In this paper, the specification of the longitudinal ventilation necessary to prevent upstream movement of combustion products in a tunnel fire is discussed, and the effects of changes in the shape, size and location of the fire on the critical velocity have been investigated.
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Study of critical velocity and backlayering length in longitudinally ventilated tunnel fires
TL;DR: In this paper, a correlation between the ratio of ventilation velocity to critical velocity and the dimensionless backlayering length was proposed to predict the backlayer length in two longitudinally ventilated model tunnels.
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Studies on buoyancy-driven back-layering flow in tunnel fires
Longhua Hu,R. Huo,Wan Ki Chow +2 more
TL;DR: In this article, a semi-empirical model was formulated and compared with former expressions appearing in the literature predicting the back-layering length and critical longitudinal ventilation velocity in tunnel fires.
Journal ArticleDOI
Simple model for control of fire gases in a ventilated tunnel
TL;DR: In this paper, a model of a tunnel fire is proposed to describe the behavior of the fire gases spreading in opposite direction to a fresh air current induced by tunnel ventilation, which yields an analytic formula for estimating the critical ventilation velocity, which is required to prevent backlayering.