Improvements of Ignition and Combustion Characteristics in a Compression-Ignition Alcohol Engine - Effects of Compression Ratio and Hot EGR on Mixture Formation of Alcohol Spray, Ignition and Combustion

摘要

This study deals with the improvements of ignition and combustion for an alcohol spray to realize a high performance alcohol engine. We focused on the effects of compression ratio and hot EGR as the ways to realize higher temperature of entrained gas to a spray on ignition and combustion in a DI alcohol engine. Experiments were carried out in the three cases of compression ratio with hot EGR (0～30%) Results indicated that expanding the running area with stable self-ignition and combustion were possible by the control of hot EGR ratio under the high compression condition (ε=23).