Heat fluxes under the ceiling induced by wall fires with various burner aspect ratios in a channel

A detailed experimental investigation of wall fires in a channel was conducted to study the heat fluxes under the ceiling. Various burner aspect ratios and fire heat release rates were employed to simulate different wall fire scenarios. The effect of source-ceiling height was also examined. The results show that the distri-bution of heat flux under the ceiling from fires on rectangular burners was significantly influenced by the burner aspect ratio. As the burner aspect ratio increased, the heat flux under the ceiling at a given position perpendicular to the side wall increased. It was found that the existing heat flux correlation developed for a square burner could not capture such influence as it did not include the burner aspect ratio. A new predictive model based on the equivalent burner diameter concept was proposed incorporating the burner aspect ratio and was shown to predict well the heat flux for all the cases with different heat release rates, burner aspect ratios and source-ceiling heights. The model was also validated against available data in the literature which were not used in its derivation. Further analysis was also conducted for the temperature contours constructed from the temperature measurements under the ceiling. (c) 2020 The Combustion Institute. Published by Elsevier Inc. All rights reserved.

Automated summary

An experimental study on wall fires in a channel was conducted to investigate heat fluxes under the ceiling. Different burner aspect ratios and fire heat release rates were used, and a new predictive model based on equivalent burner diameter concept was proposed to accurately predict heat flux in various scenarios. The model was validated against literature data and showed good predictive capability for heat flux.