@article{ref1,
title="Influence of fingering instability on flame spread characteristics in a narrow space",
journal="Journal of the Combustion Society of Japan",
year="2019",
author="Funashima, Koshi and Iizuka, Hiroyuki and Kuwana, Kazunori and Kushida, Genichiro",
volume="61",
number="197",
pages="250-257",
abstract="Near-limit flame spread is a topic of extensive fire research, and recent studies pointed out that near-limit flame spread characteristics were significantly affected by flame instability. This study considers opposed-flow flame spread in a narrow channel, in which oxygen supply by natural convection is suppressed, leading to near-limit conditions. Fingering instability appears when the oxidizer flow velocity or the channel height is small. A major objective of this study is to numerically examine the influence of fingering instability on the flame spread velocity and the extinction limit. Three-dimensional basic equations are first developed and then reduced to two-dimensional ones considering the narrowness of the domain. Numerical solutions of the two-dimensional model, in particular, fingering patterns and flame spread velocities are compared with previous experimental data, and reasonable agreement between them is confirmed. Traveling wave solutions for one-dimensional basic equations are then obtained and compared with the corresponding two-dimensional solutions. It is found that the two-dimensional flame spread velocity is faster than the one-dimensional value because the reaction is enhanced by instability. It is also found that two-dimensional flame spread is possible under certain conditions for which extinction occurs in one-dimensional flame spread. Dependence of flame spread velocity and extinction limit on model parameters is finally discussed based on predictions of the one-dimensional model.<p /> <p>Language: ja</p>",
language="ja",
issn="1347-1864",
doi="10.20619/jcombsj.1901",
url="http://dx.doi.org/10.20619/jcombsj.1901"
}