Smoke movement in tilted tunnel fires with longitudinal ventilation

Chow, Wan Ki; Gao, Yuan; Zhao, Jiaming; Dang, J.; Chow, Cheuk Lun; Miao, Lei

doi:10.1016/j.firesaf.2015.04.001

Cited by 153 publications

(60 citation statements)

References 25 publications

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“…The temperature measurement accuracy of the Wu and Bakar experiments is ±2 to 3°C near upstream and downstream of the fire source. There are considerable numerical studies that have validated their numerical results using the Wu and Bakar experimental data.…”

Section: Resultsmentioning

confidence: 99%

Numerical simulation to investigate the induced buoyant flow characteristics caused by intensive heat in complex curvilinear geometries

Savalanpour

Farhanieh

Afshin

2018

Heat Trans. Asian Res.

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The buoyancy-induced turbulent flows in complex geometries with internal heat source have important application in enclosure fire dynamics, for example, smoke movement in the situation of fire in tunnels. The majority of computational works studying the fireinduced hot air movement in such cases use a Cartesian coordinate system. Hence, to simulate curved geometries, the Cartesian grid should be refined so that it comparatively matches the geometry. In the present work, a three-dimensional numerical method using nonorthogonal curvilinear coordinate system was developed. Numerical simulations were performed to study the flow structures and the heat transfer characteristics of fire-induced buoyant flow and the effects of using curvilinear coordinates on the result's accuracy and the computational cost. Numerical results were compared with the available experimental data and the results obtained by fire dynamics simulator (FDS) software. The results of the present method showed better agreement with the experimental results when compared with the FDS results. K E Y W O R D S Buoyant flow, curvilinear coordinate, intensive heat source, numerical study, tunnel fire Heat Transfer-Asian Res. 2019;48:835-853.wileyonlinelibrary.com/journal/htj

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Section: Resultsmentioning

confidence: 99%

Numerical simulation to investigate the induced buoyant flow characteristics caused by intensive heat in complex curvilinear geometries

Savalanpour

Farhanieh

Afshin

2018

Heat Trans. Asian Res.

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“…In terms of critical ventilation velocity, both Oka and Li revealed that the dimensionless critical velocity was proportional to the one‐third power of dimensionless HRR under the small‐ and mid‐scale HRRs, while nearly independent of HRR under the large‐scale HRRs. In addition, the influences of tunnel cross‐sectional geometry, tunnel gradient, vehicular blockage, and longitudinal fire location on the smoke back‐layering and critical ventilation velocity were also studied.…”

Section: Introductionmentioning

confidence: 99%

Study on the smoke back‐layering and critical ventilation in the road tunnel fire at high altitude

Zhang

Wang

et al. 2019

Fire and Materials

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Summary A series of numerical simulations were conducted in order to investigate the characteristics of smoke back‐layering and critical ventilation in the road tunnel at high altitude with reduced ambient atmospheric pressures. The results indicated that the smoke back‐layering length decreases with the reduction of ambient pressure. Meanwhile, the dimensionless critical longitudinal ventilation velocity decreases with one‐third power of the factor of ambient pressure at high altitude. By modifying the traditional dimensionless fire heat release rate with ambient pressure, new models were deduced to predict the smoke back‐layering length and critical ventilation velocity in the road tunnel at high altitude.

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“…In addition, there are a lot of studies to focus on sensitivity analysis of the maximum temperature and its spread in tunnel fires, including the influence of tunnel curvature, sloping, blockage, cross-section, ventilation velocity, natural smoke exhaust shaft and fire suppression [19][20][21][22][23][24][25][26][27][28][29][30][31]. Recently, extensive studies on transverse fires in a tunnel have further been reported through full-scale tests, model-scale experiments and numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the smoke temperature distribution alongside the lining in tunnel fires

Wang

Huang

et al. 2019

Therm sci

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Tunnel fire temperature is a key factor for tunnel structural safety and evacuation. This study aimed to investigate the smoke temperature distribution alongside the lining across the section and effects of pool sizes and fuels on it through a series of small-scale experiments. The results showed the heat release rates of diesel were significantly lower than gasoline's when they had the same pool size and volume. Nevertheless, the duration of diesel combustion increased obviously. As a result, the maximum smoke temperature under the ceiling for gasoline was significantly higher than diesel's. The results were subsequently adopted to compare with other test results and illustrated a similar result. The initial temperature rising rates for gasoline pool fires were shown to agree well with the standardized temperature curves, but they were significantly lower for diesel pool fires. Two exponential correlations on vertical temperature distribution were provided, respectively, for gasoline and diesel fires. These findings are expected to be useful for the design of the thermal boundary on the lining in tunnel fires.

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Smoke movement in tilted tunnel fires with longitudinal ventilation

Cited by 153 publications

References 25 publications

Numerical simulation to investigate the induced buoyant flow characteristics caused by intensive heat in complex curvilinear geometries

Numerical simulation to investigate the induced buoyant flow characteristics caused by intensive heat in complex curvilinear geometries

Study on the smoke back‐layering and critical ventilation in the road tunnel fire at high altitude

Experimental study on the smoke temperature distribution alongside the lining in tunnel fires

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