Surrounding Gas Pressure and Oxygen Concentration Dependence on Auto-ignition Phenomena for Ethanol-Diethyl Ether Blended Fuel Sprays

Abstract

This study deals with the development of controlled-ignition technology for high performance compression ignition alcohol engines. The objective of this study is quantitative evaluation of main factors that influence auto-ignition of an alcohol spray. Spray mixture formation and auto-ignition phenomena of ethanol-diethyl ether blended fuels were visualized by shadowgraph method and images were recorded with high-speed camera (8213 fps). Effects of surrounding gas pressure and oxygen concentration on ignition delay for tested fuels were investigated. The results showed that ignition delay was strongly depended on surrounding gas pressure and oxygen concentration with decreasing of diethyl ether blended ratio.