Experiment Study of Stratified Combustion at Different Boost Pressure

A study was undertaken to examine the effect of charge stratification on combustion on a optical engine in this paper. Planar laser induced fluorescence was employed to view charge stratification, together with on-line combustion analysis. Using intake manifold pressure as a means to govern the dilution ratio of air to charge in the cylinder, and therefore the level of stratification, it has been found that as the global AFR of the combustion increased, the stratified charge structure could maintain reasonable combustion stability in lean condition. The reduction in AFR in the vicinity of the spark event ensured rapid kernel development, the overall bulk combustion duration benefited form the richer mixture and the reduction in propagation length required in order to consume the vast majority of fuel.