[1] Tong Yan, Shi Mingheng, Zhai Zhiqiang,. Smoke distribution in naturally ventilated urbantransportation tunnels with multiple shafts [J]. Journal of Southeast University (English Edition), 2013, 29 (3): 305-309. [doi:10.3969/j.issn.1003-7985.2013.03.014]

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Smoke distribution in naturally ventilated urbantransportation tunnels with multiple shafts()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

29

Issue:

2013 3

Page:

305-309

Research Field:

Energy and Power Engineering

Publishing date:

2013-09-20

Info

Title:

Smoke distribution in naturally ventilated urbantransportation tunnels with multiple shafts

Author(s):

Tong Yan¹;  Shi Mingheng²;  Zhai Zhiqiang³

¹College of Urban Construction and Safety Engineering, Nanjing University of Technology, Nanjing 210009, China
²School of Energy and Environment, Southeast University, Nanjing 210096, China
³Department of Civil Environmental and Architectural Engineering, University of Colorado at Boulder, CO 80309, USA

Keywords:

tunnel;  natural ventilation;  multiple shafts;  large eddy simulation;  smoke spreading

PACS:

TU834

DOI:

10.3969/j.issn.1003-7985.2013.03.014

Abstract:

The smoke spreading law of urban transportation tunnels with multiple shafts under natural ventilation is studied. A full-scale burning experiment is conducted in an actual tunnel. The study shows that smoke temperatures below the tunnel ceiling reduce rapidly along the longitudinal towards the tunnel exits. A noticeable temperature stratification is observed near the fire source. Most fire smoke is exhausted out of the shafts, while the number of the smoke shafts in the downstream is more than that in the upstream. Large eddy simulation(LES)based on computational fluid dynamics(CFD)is carried out using the fire dynamics simulator(FDS)software with parallel processing in which the grid size of the fire-domain is set to be 0.083 m. The simulation results of temperatures under the ceiling, the smoke fronts and the shafts’ smoke exhaust or air supply agree reasonably with the experimental data. Further simulations indicate that the decreasing ambient temperature or shaft spacing might reduce smoke temperatures under the tunnel ceiling and increase mass flow rates out of the shafts. This study provides technical scientific evidence and supports for the design and construction of such kinds of tunnels.

References:

[1] Ministry of Communications of China. JTJ026.1—1999 Specifications for design of ventilation and lighting of highway tunnel[S]. Beijing: China Communications Press, 1999.(in Chinese)
[2] Lee S R, Ryou H S. A numerical study on smoke movement in longitudinal ventilation tunnel fires for different aspect ratio[J]. Building and Environment, 2006, 41(6): 719-725.
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[6] Chow C L, Li J. An analytical model on static smoke exhaust in atria[J]. Journal of Civil Engineering and Management, 2010, 16(3):372-381.
[7] Tong Yan, Shi Mingheng, Gong Yanfeng, et al. Full-scale experimental study on smoke flow in natural ventilation road tunnel fires with shafts[J]. Tunnelling and Underground Space Technology, 2009, 24(6): 627-33.
[8] Karlsson Björn, Quintiere James G. Enclosure fire dynamics[M]. New York: CRC Press LLC, 2000.
[9] McGrattan K. Fire dynamics simulator(version 4): technical reference guide [R]. Washington DC: National Institute of Standards and Technology, 2006.
[10] Van Maele K, Merci B. Application of RANS and LES field simulations to predict the critical ventilation velocity in longitudinally ventilated horizontal tunnels[J]. Fire safety Journal, 2008, 43(8): 598-609.
[11] McGrattan K. Fire dynamics simulator(version 4): user’s guide [R]. Washington DC: National Institute of Standards and Technology, 2006.

Memo

Memo:

Biography: Tong Yan(1973—), female, doctor, associate professor, njtongyan@njut.edu.cn.
Foundation items: The National Natural Science Foundation of China(No.51178217), the Natural Science Foundation of Jiangsu Province(No.BK2011804).
Citation: Tong Yan, Shi Mingheng, Zhai Zhiqiang. Smoke distribution in naturally ventilated urban transportation tunnels with multiple shafts.[J].Journal of Southeast University(English Edition), 2013, 29(3):305-309.[doi:10.3969/j.issn.1003-7985.2013.03.014]

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