The maximum temperature of buoyancy-driven smoke flow beneath the ceiling in tunnel fires

Li, Ying Zhen; Lei, Bo; Ingason, Haukur

doi:10.1016/j.firesaf.2011.02.002

Cited by 436 publications

(162 citation statements)

References 8 publications

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“…The Reynolds number is not conserved in the different scales. Previous studies by the authors have, however, proved that model-scale studies can give interesting results and give important information on fire behaviours under different conditions [7][8][9][10][11][12][13][14][15]. Table 1.…”

Section: Scalingmentioning

confidence: 99%

Fire development in different scales of train carriages

Li¹,

Ingason²,

Lönnermark³

2014

Fire Saf. Sci.

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A fire development analysis of three series of train carriage fire tests in different scales was carried out. These train carriage fire tests included 1:10 model scale tests, 1:3 model scale tests and 1:1 full scale tunnel tests. The heat release rate (HRR) correlations between different scales of carriage fire tests were carefully investigated. The mechanism of fire development is very similar in different scales of tests involving fully developed fires. After the critical fire spread, the fire travelled along the carriage at an approximately constant speed. The maximum heat release rate obtained for a fully developed fire is dependent on the ventilation conditions and also the type and configuration of the fuels, and a simple equation has been proposed to estimate the maximum heat release rate. A global correction factor of the maximum heat release rate is presented and examined.KEYWORDS: train carriage fire, different scales, correlation, fire tests, fire development, local flashover, maximum heat release rate. NOMENCLATURE LISTING

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Section: Scalingmentioning

confidence: 99%

Fire development in different scales of train carriages

Li¹,

Ingason²,

Lönnermark³

2014

Fire Saf. Sci.

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“…According to previous researches (Li and Ingason 2011;Oka et al 2013;Hu et al 2006;Kurioka et al 2003) the maximum temperature ΔTmax at vault of Region 1 is closely related with fire power. Therefore, it were fitted based on the following Eq.…”

Section: Free-spreading Smoke Temperature Distributionmentioning

confidence: 85%

Maximum Smoke Temperature in Non-Smoke Model Evacuation Region for Semi-Transverse Tunnel Fire

Lou

Qiu

Long

2017

JAFM

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Smoke temperature distribution in non-smoke evacuation under different mechanical smoke exhaust rates of semi-transverse tunnel fire were studied by FDS numerical simulation in this paper. The effect of fire heat release rate (10MW 20MW and 30MW) and exhaust rate (from 0 to 160m 3 /s) on the maximum smoke temperature in non-smoke evacuation region was discussed. Results show that the maximum smoke temperature in non-smoke evacuation region decreased with smoke exhaust rate. Plug-holing was observed below the smoke vent when smoke exhaust rate increased to a certain value. Smoke spreading distance can be divided into three stages according to changes of smoke exhaust rate. The maximum smoke temperature model concluded that the peak temperature rise at tunnel vault is proportional to 0.75 power of dimensionless fire power. The maximum temperature in non-smoke evacuation region decays exponentially with the increase of smoke exhaust rate. However smoke vent interval influences the dimensionless maximum temperature in nonsmoke evacuation region slightly. Smoke vent interval influences the dimensionless maximum temperature in non-smoke evacuation region slightly.

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“…where H is the (ceiling) height from heat source, m. Li [23] has proposed a model to predict the maximum hot smoke temperature beneath the ceiling through scaling analysis along with correlations of the experimental results:…”

Section: Theoretical Modelmentioning

confidence: 99%

“…(15)) [23] when dimensionless ventilation velocity exceeds 0.19 and is lower than 0.19 are given in Figs. 5(a) and (b), respectively.…”

Section: Comparison Of Model Predictions With Experimentsmentioning

confidence: 99%

See 1 more Smart Citation

Thermal buoyant smoke back-layering flow length in a longitudinal ventilated tunnel with ceiling extraction at difference distance from heat source

Chen

Zhang

et al. 2015

Applied Thermal Engineering

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The maximum temperature of buoyancy-driven smoke flow beneath the ceiling in tunnel fires

Cited by 436 publications

References 8 publications

Fire development in different scales of train carriages

Fire development in different scales of train carriages

Maximum Smoke Temperature in Non-Smoke Model Evacuation Region for Semi-Transverse Tunnel Fire

Thermal buoyant smoke back-layering flow length in a longitudinal ventilated tunnel with ceiling extraction at difference distance from heat source

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