In-cylinder flame luminosity measured from a stratified lean gasoline direct injection engine

• Main Authors: J. Jeon, N. Bock, W.F. Northrop
• Format: Article
• Language: English
• Published: Elsevier 2019-03-01
• Series: Results in Engineering
• Online Access: http://www.sciencedirect.com/science/article/pii/S2590123019300052

In-cylinder flame luminosity has been used to diagnose combustion process and the formation of soot emissions in compression-ignition engines. Increased soot particle emissions from spark-ignited gasoline direct injection (GDI) engines, especially those with stratified fuel-air mixtures, requires investigation of responsible anomalous flame behavior. In this work, spatiotemporal in-cylinder flame luminosity is reported from a lean stratified operating condition in a modern GDI engine. Significant fuel mass injected near top dead center led to detectable piston-top pool fires that have previously correlated to significant soot particle emissions. The demonstrated result shows that measuring in-cylinder flame luminosity is a viable tool for identifying soot-causing flames in GDI engines.