Flame height correlation and upward flame spread modelling
Flame height correlation and upward flame spread modelling
复制标题
DOI：
10.1002/fam.809
复制
发表时间：
2002-11
影响因子：
1.9
通讯作者：
Kuang‐ Chung Tsai;D. Drysdale
中科院分区：
文献类型：
--
作者：
Kuang‐ Chung Tsai;D. Drysdale
以往的研究表明，火焰高度是决定火焰在壁面上垂直传播速度的两个最重要的参数之一。火焰传播模型依赖于Xf=KQ ′n形式的经验火焰高度关系式，但没有精心设计的受控实验来确定这种关系式的有效性，也没有Q ′< c.25 kW/m的数据。本文提供了两组新的数据，一组是以6 mm厚的PMMA板（高25-250 mm，宽50-150 mm）为火源，同时测量Q ′和Xf的实验数据。这一组涉及到当Q现在′< 30 kW/m时墙壁火灾的早期阶段。另一组数据是用垂直燃气面板获得的，该面板由14个独立的燃烧器阵列组成，这些燃烧器被布置成允许燃烧表面的纵横比变化。数据证实火焰高度与Q今′相关，但揭示（除其他外）存在两个区域，Q今′值大于和小于c。20千瓦/米。
Previous work has demonstrated that flame height is one of the two most important parameters determining the rate of vertical flame spread on a wall. Flame spread models rely on empirical flame height correlations of the form Xf=KQ̇′n, but there have been no carefully controlled experiments designed to establish the validity of such correlations and there are no data for values of Q̇′< c.25 kW/m. Two new sets of data are presented here, one based on experiments with 6 mm thick PMMA slabs (heights 25–250 mm, width 50–150 mm) as the fire source, measuring Q̇′ and Xf simultaneously. This set relates to the early stages of a wall fire when Q̇′< 30 kW/m. The other set of data was obtained with a vertical gas‐fired panel which consisted of an array of 14 independent burners arranged to allow the aspect ratio of the burning surface to be varied. The data confirm that the flame height correlates with Q̇′, but reveal (inter alia) that there are two regions, for values of Q̇′ greater than and less than c. 20 kW/m.