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Effect of tunnel cross section on gas temperatures and heat fluxes in case of large heat release rate
Hefei University of Technology, China.
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research.ORCID iD: 0000-0001-7744-2390
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research.ORCID iD: 0000-0002-9340-6768
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research.ORCID iD: 0000-0001-6758-6067
2016 (English)In: Applied Thermal Engineering, ISSN 1359-4311, E-ISSN 1873-5606, Vol. 93, p. 405-415Article 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 10m long with varying width (0.3m, 0.45m and 0.6m) and height (0.25m and 0.4m). 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 100MW 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, p. 405-415
Keywords [en]
Model scale, Tunnel cross section, Gas temperature, Heat flux, Longitudinal ventilation
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-422DOI: 10.1016/j.applthermaleng.2015.09.048Scopus ID: 2-s2.0-84945253245OAI: oai:DiVA.org:ri-422DiVA, id: diva2:942258
Available from: 2016-06-23 Created: 2016-06-23 Last updated: 2023-06-08Bibliographically approved

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Li, Ying ZhenIngason, HaukurLönnermark, Anders

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