Premixed Combustion Characteristics in Idealized Stratified Charge Conditions

Abstract

Since the local inhomogeneity of mixture concentration inside a combustion chamber affects the combustion characteristics, a basic research on combustion phenomenon in stratified charge conditions is required. The authors have made experiments with a constant-volume chamber, which can simulate an idealized stratified charge field by using a removable partition, to obtain the combustion characteristics. As a result, it was found that pressure behavior strongly depends on flame propagation process and that the unburnt hydrocarbon amount can be reduced when a charge stratification of two combustible mixtures or that of a combustible mixture and air are made, while it increases due to a bulk quench when a combustible mixture and a too lean incombustible mixture are charge stratified.