Effect of Hot EGR on Ignition, Combustion Characteristics and Thermal Efficiency of Alcohol Fuels in a Small DI Engine with High Compression Ratio

Abstract

This study deals with the development of controlled-ignition technology for high performance compression ignition alcohol engine. The objective of this study is to make clear the effect of hot EGR on ignition, combustion characteristics and thermal efficiency of alcohol fuels in a small DI diesel engine with high compression ratio. Ignition and combustion characteristics of four kinds of alcohol fuels (Ethanol, Propanol, Butanol and Pentanol) were experimentally investigated. Experiments were carried out within the range of 1200 rpm to 1600 rpm in engine operating speed with changing hot EGR ratio under high compression ratio (ε=23).