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 distribution 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.

进行了通道内壁火的详细实验研究，以研究天花板下的热通量。各种燃烧器的长宽比和火的放热率被用来模拟不同的壁着火情况。还检查了源顶高度的影响。结果表明，矩形燃烧器着火时天花板下的热通量分布受到燃烧器纵横比的显着影响。随着燃烧器纵横比的增加，在垂直于侧壁的给定位置处的天花板下方的热通量增加。已经发现，为方形燃烧器开发的现有热通量相关性不能捕获这种影响，因为它不包括燃烧器的纵横比。提出了一种基于等效燃烧器直径概念的新预测模型，该模型结合了燃烧器的长宽比，并显示出可以很好地预测具有不同放热率，燃烧器长宽比和源极天花板高度的所有情况下的热通量。该模型还针对文献中未使用的可用数据进行了验证。还根据天花板下的温度测量结果对温度轮廓进行了进一步分析。