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Piston Wetting in an Optical DISI Engine: Fuel Films, Pool Fires, and Soot Generation
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 05, 2001 by SAE International in United States
Annotation ability available
Event: SAE 2001 World Congress
Piston-wetting effects are investigated in an optical direct-injection spark-ignition (DISI) engine. Fuel spray impingement on the piston leads to the formation of fuel films, which are visualized with a laser-induced fluorescence (LIF) imaging technique. Oxygen quenching is found to reduce the fluorescence yield from liquid gasoline. Fuel films that exist during combustion of the premixed charge ignite to create piston-top pool fires. These fires are characterized using direct flame imaging. Soot produced by the pool fires is imaged using laser elastic scattering and is found to persist throughout the exhaust stroke, implying that piston-top pool fires are a likely source of engine-out particulate emissions for DISI engines.
CitationStevens, E. and Steeper, R., "Piston Wetting in an Optical DISI Engine: Fuel Films, Pool Fires, and Soot Generation," SAE Technical Paper 2001-01-1203, 2001, https://doi.org/10.4271/2001-01-1203.
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