A theoretical model of turbulent flame propagation in reciprocating stratified-charge engines is developed and compared to a previous model. A spacial variation of mixture ratio is considered such that there is a fuel-rich region in the center of the cylinder and a fuel lean-region near the cylinder walls. The spark in the fuel-rich region results in a premixed type of flame propagating toward the walls. A diffusion-type flame results in the wake of the other flame due to the mixing of the excess air and fuel.
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