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Effect of tunnel cross section on gas temperatures and heat fluxes in case of large heat release rate
School of Transportation Engineering, Hefei University of Technology, Hefei, China.
Fire Research, SP Technical Research Institute of Sweden, Borås, Sweden.
Fire Research, SP Technical Research Institute of Sweden, Borås, Sweden.
Fire Research, SP Technical Research Institute of Sweden, Borås, Sweden. (Framtidens energi)ORCID iD: 0000-0001-6758-6067
2016 (English)In: Applied Thermal Engineering, ISSN 1359-4311, E-ISSN 1873-5606, Vol. 93, 405-415 p.Article in journal (Refereed) Published
Abstract [en]

Tests with liquid and solid fuels in model tunnels (1:20) were performed and analysed in order to study the effect of tunnel cross section (width and height) together with ventilation velocity on ceiling gas temperatures and heat fluxes. The model tunnel was 10 m long with varying width (0.3 m, 0.45 m and 0.6 m) and height (0.25 m and 0.4 m). Test results show that the maximum temperature under the ceiling is a weak function of heat release rate (HRR) and ventilation velocity for cases with HRR more than 100 MW at full scale. It clearly varies with the tunnel height and is a weak function of the tunnel width. With a lower tunnel height, the ceiling is closer to the base of continuous flame zone and the temperatures become higher. Overall, the gas temperature beneath the ceiling decreases with the increasing tunnel dimensions, and increases with the increasing longitudinal ventilation velocity. The HRR is also an important factor that influences the decay rate of excess gas temperature, and a dimensionless HRR integrating HRR and other two key parameters, tunnel cross-sectional area and distance between fuel centre and tunnel ceiling, was introduced to account for the effect. An equation for the decay rate of excess gas temperature, considering both the tunnel dimensions and HRR, was developed. Moreover, a larger tunnel cross-sectional area will lead to a smaller heat flux.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 93, 405-415 p.
Keyword [en]
Model scale; Tunnel cross section; Gas temperature; Heat flux; Longitudinal ventilation
National Category
Other Civil Engineering
Research subject
Energy- and Environmental Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-29933DOI: 10.1016/j.applthermaleng.2015.09.048Scopus ID: 2-s2.0-84945253245OAI: oai:DiVA.org:mdh-29933DiVA: diva2:882411
Available from: 2015-12-14 Created: 2015-12-14 Last updated: 2017-12-01Bibliographically approved

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Lönnermark, Anders

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