The spatial and temporal formation of nitric oxide in an optical engine operated with iso-octane fuel under spray-guided direct-injection conditions was studied with a combination of laser-induced fluorescence imaging, UV-chemiluminescence, and cycle resolved NO exhaust gas analysis. NO formation during early and late (homogeneous vs. stratified) injection conditions were compared. Strong spatial preferences and cyclic variations in the NO formation were observed depending on engine operating conditions. While engine-out NO levels are substantially lower for stratified engine operation, cyclic variations of NO formation are substantially higher than for homogeneous, stoichiometric operation.
Characterization of Combustion and NO Formation in a Spray-Guided Gasoline Direct-Injection Engine using Chemiluminescence Imaging, NO-PLIF, and Fast NO Exhaust Gas Analysis
Sae Technical Papers
2005 SAE Brasil Fuels & Lubricants Meeting ; 2005
2005-05-11
Conference paper
English
Low Emission Combustion for Spray-guided Direct Injection Gasoline Engine
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