Premixed fuel-air mixtures are introduced in backward step profile meso-scale quartz combustors. The study of flame stability limits and various shapes of the stabilized flame in micro-combustor were examined using two and three step quartz micro-combustors. Various fuel-air mixtures are used for the experiment. Methane with 99.9% purity and liquid petroleum gas (LPG) having approximately 60% butane and 40% propane were used as fuel. Stable flames were observed to exist for a range of flow rate

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... and mixture equivalence ratio conditions. The flame stability limits were relatively narrow for a 2-step micro combustor as compared to a 3 step microcombustor. Lesser CO emissions were observed for a 3-step micro combustor as compared to a 2 step microcombustor because introduction of a backward facing step increases the local residence time of mixture.