Journal
FIRE SAFETY JOURNAL
Volume 71, Issue -, Pages 20-33Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.firesaf.2014.11.002
Keywords
Temperature distribution; Ceiling jet; Inclined flat-ceilinged tunnel; Natural ventilation
Funding
- Joint Usage/Joint Research Centre of the Research Center for Fire Safety Sciences, Center for Fire Science and Technology, Tokyo University of Science
- [23310108]
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In this study, we conducted detailed measurements of the temperature distribution within a steady fire-driven ceiling jet, formed in a tunnel with a rectangular cross-section. We then compared the measured temperature distributions with those for an unconfined smooth-ceiling jet flow, and estimated the relative errors between them. The results showed that the temperature distribution in a horizontal tunnel exhibits a greater bulge than that of a ceiling jet under an unconfined ceiling and varied from a bulging shape to an exponential shape as the tunnel inclination increased. We propose a new correlation for representing the temperature distribution, which takes the tunnel inclination into account, and which consists of an exponential function and a cubic function with a coordinated transformation. (C) 2014 Elsevier Ltd. All rights reserved.
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