Effect of a Difference of Laminar Burning Mechanism between LPG and Gasoline on SI Engine Combustion

Abstract

In this study, differences of laminar burning mechanism between LPG (C₃H₈, n-C₄H₁₀, i-C₄H₁₀) and regular gasoline were investigated in detail with one-dimensional premixed laminar flame simulation. Furthermore, the effect of above differences on burning velocity of SI engine combustion was investigated with experiment and two-zone model analysis. In the results, a main elementary reaction which influences a difference of laminar burning velocity was extracted. As for burning velocity of SI engine, the difference derived from that of laminar burning velocity between C₃H₈ and gasoline was significant, and that of C₃H₈ was faster than that of gasoline under low engine speed.