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A platform for research: civil engineering, architecture and urbanism
Experimental study on temperature distribution beneath an arced tunnel ceiling with various fire locations
Highlights Flame propagation length along the ceiling is increased as the clearance reduces. Obtained temperature distribution beneath an arced ceiling with different fire locations. Proposed correlation to predict the maximum ceiling temperature with constraint effect. Modified correlation agrees with the experimental results.
Abstract This paper attempts to study experimentally the impact of fire location on the temperature distribution of thermal plume induced by fire under an arced ceiling. A series of experiments considering different pool sizes and fire locations were carried out in an arced tunnel-like structure. Two fuels (n-heptane and ethanol) were used to generate pool fires with various fire sizes. Results demonstrated that the flame was deviated from the vertical direction when the fire was close to the sidewall, meanwhile, the heat release rate (HRR) increased significantly. Consequently, the flame propagation length was enhanced due to the constraint effect, while its variation was not significant when the HRR was not large enough. The transverse ceiling temperature distribution was predicted using correlating the HRR and the vertical height above the pool for a classical model. Also, a correlation was given to calculate the maximum excess temperature beneath the centerline of the arced ceiling, and it gave a relatively good prediction for the maximum temperatures of the weak plume. Note that this correlation is only available for the ethanol fires. Nonetheless, it is necessary to further study the temperature distribution of strong plumes beneath arced ceilings with constraint effect.
Experimental study on temperature distribution beneath an arced tunnel ceiling with various fire locations
Highlights Flame propagation length along the ceiling is increased as the clearance reduces. Obtained temperature distribution beneath an arced ceiling with different fire locations. Proposed correlation to predict the maximum ceiling temperature with constraint effect. Modified correlation agrees with the experimental results.
Abstract This paper attempts to study experimentally the impact of fire location on the temperature distribution of thermal plume induced by fire under an arced ceiling. A series of experiments considering different pool sizes and fire locations were carried out in an arced tunnel-like structure. Two fuels (n-heptane and ethanol) were used to generate pool fires with various fire sizes. Results demonstrated that the flame was deviated from the vertical direction when the fire was close to the sidewall, meanwhile, the heat release rate (HRR) increased significantly. Consequently, the flame propagation length was enhanced due to the constraint effect, while its variation was not significant when the HRR was not large enough. The transverse ceiling temperature distribution was predicted using correlating the HRR and the vertical height above the pool for a classical model. Also, a correlation was given to calculate the maximum excess temperature beneath the centerline of the arced ceiling, and it gave a relatively good prediction for the maximum temperatures of the weak plume. Note that this correlation is only available for the ethanol fires. Nonetheless, it is necessary to further study the temperature distribution of strong plumes beneath arced ceilings with constraint effect.
Experimental study on temperature distribution beneath an arced tunnel ceiling with various fire locations
Zhou, Tiannian (author) / Zhou, Yang (author) / Fan, Chuangang (author) / Wang, Jian (author)
2020-02-04
Article (Journal)
Electronic Resource
English
Maximum temperature of smoke beneath ceiling in tunnel fire with vertical shafts
| British Library Online Contents | 2015
Maximum temperature of smoke beneath ceiling in tunnel fire with vertical shafts
| Online Contents | 2015