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.
Bibliographical noteFunding Information:
This material is based upon work supported by the Department of Energy, Office of Energy Efficiency and Renewable Energy (EERE) , under Award Number DE-EE0007217 .
© 2019 The Author(s)