TY  - JOUR
PY  - 2019//
TI  - Influence of fingering instability on flame spread characteristics in a narrow space
JO  - Journal of the Combustion Society of Japan
A1  - Funashima, Koshi
A1  - Iizuka, Hiroyuki
A1  - Kuwana, Kazunori
A1  - Kushida, Genichiro
SP  - 250
EP  - 257
VL  - 61
IS  - 197
N2  - 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>
LA  - ja
SN  - 1347-1864
UR  - http://dx.doi.org/10.20619/jcombsj.1901
ID  - ref1
ER  -