Abstract
The flammability limit of flame spread over a solid material with opposed flow was investigated by scale analysis, and the result was compared with the experimental results by parabolic flight. The sample material was a PMMA sheet whose thickness was 125μm. In the scale analysis, the effect of both radiation loss and finite kinetics were included in the expression of non-dimensional flame spread rate. We derived the following equation for non-dimensional spread rate, η+1/Da_R+1/Da〜1, and assumed that the extinction occurred at η〜0. The developed model reasonably predicted the behavior of the flame spread near minimum limiting oxygen concentration (MLOC), but still underestimated MLOC.
