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An analysis of carbone monoxide distribution in large tunnel fires

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Abstract

Fire events and the related toxicants such as CO are responsible for many fatalities in the current century. These hazardous events are much more dangerous when they occur in enclosed spaces. In the present study, a theoretical relation is developed for horizontal distribution of CO in a large tunnel fire. Then, the developed criterion is used to study the effect of some rudimentary parameters such as the heat release rate (HRR) of fire and tunnel’s aspect ratio (AR) on CO and temperature stratification. Theoretical results of various heat release rates and aspect ratios for horizontal distribution of CO are compared with numerical results using fire dynamics simulator (FDS5.5). It is found that big fires have higher rates of CO concentration decay in comparison to the smaller ones due to higher air entrainment into the travelling plume. It is indicated that the smoke travelling at higher values of tunnel AR, dilutes faster. Moreover, using FDS5.5, the relevant variations in temperature and CO concentration are discussed for tunnel angles ranging from −20° to 20°.

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Authors and Affiliations

  1. Center of Excellence in Energy Conversion, School of Mechanical Engineering, Sharif University of Technology, P. O. Box 11365-9567, Tehran, Iran

    Atta Sojoudi, Hossein Afshin & Bijan Farhanieh

Authors
  1. Atta Sojoudi
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  2. Hossein Afshin
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  3. Bijan Farhanieh
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Corresponding author

Correspondence to Hossein Afshin.

Additional information

Recommended by Associate Editor Jun Sang Park

Atta Sojoudi received B.S. degree (with highest honors) from Tabriz University in 2012, and now is M.S.c student in the Mechanical Engineering Department at Sharif University of Technology (SUT) under the supervision of Professor Bijan Farhanieh. His research interests are numerical studies in fluid mechanics and heat and mass transfer.

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Sojoudi, A., Afshin, H. & Farhanieh, B. An analysis of carbone monoxide distribution in large tunnel fires. J Mech Sci Technol 28, 1917–1925 (2014). https://doi.org/10.1007/s12206-014-0339-4

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  • DOI: https://doi.org/10.1007/s12206-014-0339-4

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