Study on combustion and emissions characteristics of acetone-butanol-Ethanol(ABE)/gasoline premixed fuel in CISI engines

Abstract

ABE (acetone-butanol-ethanol) was a clean biomass substitute fuel. This paper investigated the combustion and emission performance of ABE/gasoline premixed fuel Combined Injection Spark Ignition engine with various ABE ratios and direct injection ratios. Thus exploring the potential of ABE/gasoline premixed fuel for use in combined injection engines. Results showed that high ABE ratios (≥75 %) can increase maximum cylinder pressure and BMEP by 3.8 % at least with various direct injection ratios (except P0G100), and increasing the duration of the flame development by 28.7 % at least. With different ABE ratios, the duration of the flame propagation increased by 17.1 % at least and maximum heat release rate decreased by 15.8 % at least as the direct injection ratio increased from 0 % to 100 %. With various ABE ratios, using high direct injection ratios (≥75 %) would increase HC emissions by 1.3 % at least, decrease CO emissions by 3.8 % at least and decrease NOx emissions by 11.0 % at least compared to P100G0. Particle Numbers increased with increasing direct injection ratios under different ABE ratios, and reached the minimum value at ABE100 with certain direct injection ratios (≥25 %). Moreover, increasing the ABE blended ratio reduced the number of particles obtained from fuel combustion emissions (except P75G25).