Flame Propagation and Fractal Dimension in a Concentric Double Cylinders Apparatus
Flame Propagation and Fractal Dimension in a Concentric Double Cylinders Apparatus
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同心双筒装置中的火焰传播和分形维数
DOI：
10.11395/jjsem.14.s101
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
K. Kuwana
中科院分区：
文献类型：
--
作者：
Y. Noguchi;K. Nakamura;Y. Hagiwara;S. Hitomi;K. Kuwana
本文通过实验测量甲烷/空气混合物火焰的表观传播速度来估计火焰的分形维数。在这项研究中，我们使用了由两个同心圆柱体组成的装置。结果表明，火焰尺度越大，火焰的褶皱数越多，火焰的表观传播速度越快，火焰的分形维数在1.3 ~ 2.0之间变化。还发现分形维数随着当量比的减小而增加，这可能是由于优先扩散和/或刘易斯数的变化的影响。
The aim of this study is to estimate the flame fractal dimensions of methane/air mixtures by experimentally measuring the apparent flame-propagation velocities. In this study, we used an apparatus consisting of two concentric cylinders. It was found that the larger the cylinder size, ie the flame scale, is,(i) the more the number of wrinkles of flame is,(ii) the faster the apparent flame-propagation velocity is, and (iii) the values of flame fractal dimension are varied from 1.3 to 2.0. It was also found that the fractal dimension increases with a decrease in equivalence ratio, which is likely because of the effect of preferential diffusion and/or the change in the Lewis number.