Observation of Flame Propagation in an LPG Lean Burn SI Engine

1999-01-0570

03/01/1999

Event
International Congress & Exposition
Authors Abstract
Content
Using an extended bottom view piston having a quartz window, flame propagation observation and flame contour analysis were carried out to investigate the combustion characteristics of a heavy-duty type LPG lean burn engine. The swirl ratio and piston cavity configuration were varied to investigate their effects on combustion and engine performance. Gradual reduction of NOx but increased hydrocarbon emissions were measured for leaner mixtures compared to the stoichiometric operation. High swirl apparently accelerated the initial flame kernel development, as evidenced by a shorter crank angle interval from the spark ignition to the maximum cylinder pressure. The ā€˜Dā€™ type cavity, with an increased squish area located below the intake valve, was shown to have the shortest burn duration among the piston cavities tested. The experimental flame propagation observation procedure was shown to be useful for the study of the combustion process in engines.
Meta TagsDetails
DOI
https://doi.org/10.4271/1999-01-0570
Pages
13
Citation
Lee, D., Shakal1, J., Goto, S., Ishikawa2, H. et al., "Observation of Flame Propagation in an LPG Lean Burn SI Engine," SAE Technical Paper 1999-01-0570, 1999, https://doi.org/10.4271/1999-01-0570.
Additional Details
Publisher
Published
Mar 1, 1999
Product Code
1999-01-0570
Content Type
Technical Paper
Language
English