Modeling of post-injection strategies of ethanol and experimental analysis of the use of ethanol in the form of dual fuel and emulsion in diesel engine

Abstract

In this research, as the first stage, the effects of the ethanol on engine\n performance and emissions under the fumigation and emulsion method were\n experimentally investigated under part load and various engine speed\n conditions. Diesel-ethanol blend containing 5% ethanol by volume was used as\n the mixture fuel. In the fumigation method, ethanol was used at the same\n rate and 99.9% purity as the emulsion method. As the second stage, the\n effects of ethanol post injection on engine performance and pollutant\n emissions were investigated in the experimental engine modeled in AVL Boost\n simulation program and compared with the experimental results. Simulation\n post injection tests were performed separately after the main injection at 3\n CA (P1) and 7 CA (P2) crank angles. In the experimental studies, NOx\n emission decreased with the emulsion method (E5) at low and high engine\n speeds. In post injection strategies, NOx emission in general increased due\n to improved combustion and increased in-cylinder temperature with P1 (first\n post injection) and P2 (second post injection) strategies. Soot emission\n decreased significantly with E5. This improvement in soot emissions was\n approximately 87% in post injection strategies.