Cycle-by-Cycle Variations in Combustion and Mixture Concentration in the Vicinity of Spark Plug Gap

950814

02/01/1995

Event
International Congress & Exposition
Authors Abstract
Content
The correlations between IMEP and pressures at referenced crank angles have different trends for different equivalence ratios. A fiber optic spark plug was used to detect the initial flame development which was then used to analyze the combustion cyclic variation. Rayleigh scattering measurements were applied to detect the air-fuel mixture fluctuations in the vicinity of spark plug gap for both homogeneous and inhomogeneous mixture preparations in a spark ignition engine.
The variation in mixture concentration in the vicinity of spark plug gap was not confirmed as a major contributor to cycle-by-cycle variation in combustion for any of the homogeneous mixture cases or for the stoichiometric and lean mixtures of port injection. However, a leaner mixture((ϕ=0.80) of port injection did correlate with the cyclic variation in combustion.
Meta TagsDetails
DOI
https://doi.org/10.4271/950814
Pages
16
Citation
Lee, K., and Foster, D., "Cycle-by-Cycle Variations in Combustion and Mixture Concentration in the Vicinity of Spark Plug Gap," SAE Technical Paper 950814, 1995, https://doi.org/10.4271/950814.
Additional Details
Publisher
Published
Feb 1, 1995
Product Code
950814
Content Type
Technical Paper
Language
English