Temperature distribution within a ceiling jet propagating in an inclined flat-ceilinged tunnel with natural ventilation |
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| Affiliation: | 1. Faculty of Urban Construction and Environmental Engineering, Chongqing University, Chongqing 400045, China;2. Key Laboratory of Three Gorges Reservoir Region''s Eco-Environment, Ministry of Education, Chongqing 400045, China;3. National Centre for International Research of Low-carbon and Green Buildings, Chongqing 400045, China |
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| Abstract: | 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. |
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| Keywords: | Temperature distribution Ceiling jet Inclined flat-ceilinged tunnel Natural ventilation |
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