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- Title
Experimental study of reduced pressure effect on radiation feedback to the fuel surface of pool fires.
- Authors
Li, Pan; Liu, Jiahao; Zhang, Deman; Chen, Guofeng; Wang, Jian
- Abstract
To investigate low air pressure effect on the flame radiative feedback to the fuel surface, pool fires with stable liquid surface were performed by employing three round burners with diameters of 0.15 m, 0.25 m and 0.35 m in both Lhasa (3650 m/64 kPa) and Hefei (24 m/100.8 kPa). Incident heat flux at fuel surface, flame shape and axial temperature distribution were compared at two sites. The flame envelope for 0.15 m appears to be cylinder, while that for 0.35 m tends to be cone, and the mean flame height is larger in reduced pressure for the same pool dimension. The averaged flame temperature is relatively higher in Lhasa due to reduction in air entrainment and thermal radiation loss, and the axial temperature rises could be scaled in the form of z P / Q 2 / 5 . Experimental findings also reveal that low pressure reduces the radiation feedback evidently for different scale pool fires and the averaged value could be correlated against T f 5 P 2 L m . The radiation feedback fraction X a is around 0.30 for 0.15 m pool fires, while it is 0.55 in Lhasa for 0.35 m pool fire, lower than 0.76 in Hefei.
- Subjects
LHASA (China); HEFEI Shi (China); HEAT release rates; RADIATION pressure; FLAME; TEMPERATURE distribution; HEAT radiation &; absorption; FLAME temperature; AIR pressure; LIQUID surfaces
- Publication
Journal of Thermal Analysis & Calorimetry, 2021, Vol 144, Issue 3, p883
- ISSN
1388-6150
- Publication type
Article
- DOI
10.1007/s10973-020-09545-7