Local flame front disturbance development under acceleration

Abstract The development of a local flame front disturbance in an accelerating gas flow was explored using high-speed schlieren photography. The movement of the local flame front was examined in detail, and, based on these results, the flow field around the disturbed flame front was inferred. From this, it was confirmed that in an accelerating flow field, the unburned gas penetrates into the burned gas region at a velocity about 30 times higher than the laminar burning velocity. Flame front acceleration generates intense shear flow layers across disturbed flame fronts.