Upward Flame Spread on a Flat Surface, in a Corner and between Two Parallel Surfaces

平面、角落及二平行板間之向上火焰延燒

蔡匡忠(Kuang-Chung Tsai)

《中國機械工程學刊》 28卷3期 (2007/06) Pp. 341-348

https://doi.org/10.29979/JCSME.200706.0011

摘要

向上火焰延燒是最快的延燒方式，一般認為在角落或二平行板間的情況更為迅速，本論文即以實驗研討此課題，結果發現，在牆面火災發展早期，角落之牆面火災延燒最為迅速，其餘二者差異不大，因此二平行板間之早期延燒預測可採用單一牆面情形即可。另分析其火焰高度及加熱強度後可歸納，火焰高度扮演重要角色，而其加熱強度差異並不大。

並列摘要

Previous studies have demonstrated that upward flame spread on a flat surface is the ＜||＞worst＜||＞ orientation for fire growth. Furthermore, upward flame spread in a corner and between two parallel surfaces are expected to lead to more rapid flame spread due to extra heat feedback and reduced air entrainment. Experiments were designed to study the fire behaviors of these geometries of wall fires, and samples used were 6 mm thick, 8 mm wide and 1 m tall PMMA slabs. Flame height, heat feedback to the unburned surface and flame spread rate were the parameters discussed. The corresponding observations found that the flame height correlation played an important role for flame spread for it differs among these three geometries. The influence of heat feedback was not crucial. In addition, the flame spread in a corner is the fastest while the difference of flame spread rate between the other two scenarios was not obvious. Therefore, for practical use, the prediction for wall fires on a flat surface can be inferred to the two parallel walls case.

並列關鍵字

Fire safety engineering ； upward flame spread