Experimental study of sidewall effect on flame characteristics of heptane pool fires with different aspect ratios and orientations in a channel

• A series of small scale tests was conducted to investigate the influence of sidewall on flame characteristics of heptane pool fires in a channel, considering pool shape (aspect ratio: 1, 2, 4 and 8) and pool orientation relative to sidewall. Distance between fire and sidewall was changed systematically. Both transverse flame development (along the direction of channel width) and longitudinal flame development (along the direction of channel length) were recorded by digital video. Results show that for a fixed fire location, the heat release rate increases with the increasing pool aspect ratio (namely a larger pool perimeter), which indicates more air entrainment and more intense combustion. In wall fire cases, when the long pool rim is perpendicular with channel sidewall, the flame can obtain more air entrainment with a weaker boundary restriction from the sidewall, compared to the case with the long pool rim being parallel with sidewall. Comparison of some previously established correlations based on various experimental conditions with our test results is made. Due to the fact without considering sidewall effect and fuel shape on the air entrainment of fire plume, the classic correlations need to be further improved. Therefore, an integral flame length model considering both sidewall effect and fuel shape is developed, which correlates well with all the data from cases with various pool positions, orientations and aspect ratios. © 2016 The Combustion Institute. Published by Elsevier Inc.

Nyckelord

Air entrainment

Flame length

Fuel shape

Pool fire

Sidewall effect

Aspect ratio

Combustion

Computer graphics

Fire protection

Fires

Fuels

Heptane

Lakes

Multimedia systems

Supersonic aerodynamics

Experimental conditions

Flame characteristics

Heat Release Rate (HRR)

Heptane pool fires

Pool fires

Sidewall effects

Small-scale tests

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