Growth of Flame Front Turbulence During Flame Propagation Across an Obstacle

Abstract The growth of flame front turbulence, when a flame was propagating through a methane-air mixture acceleratedly flowing across a block, was examined by high-speed schlieren photography. Three types of flame front turbulence induced by different mechanisms were observed to appear. The turbulence induced by the Taylor-Markstein mechanism appeared at the leading flame front normal to the direction of mixture acceleration and became of a needle-like structure over the block. In the present particular situation, the turbulence that appeared at the flame front parallel to the direction of acceleration and that near the walls grew later and their rales of growth were much smaller than that which appeared at the leading flame front