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Visualisation of fuel‐lubricant interaction on the cylinder surface in the combustion chamber of SI engines
Author(s) -
Kovács A.
Publication year - 1995
Publication title -
lubrication science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.632
H-Index - 36
eISSN - 1557-6833
pISSN - 0954-0075
DOI - 10.1002/ls.3010070204
Subject(s) - combustion chamber , materials science , penetration (warfare) , combustion , ignition system , internal combustion engine , lubricant , composite material , petroleum engineering , environmental science , automotive engineering , chemistry , aerospace engineering , engineering , organic chemistry , operations research
Visualisation of fuel component penetration and release into the lubricating oil layer covering the combustion chamber wall has been achieved, using a laser‐induced fluorescence (LIF) test technique. Experimental data show that fuel component penetration into the oil layer contributes not only to unburnt hydrocarbon emissions in spark ignition (SI) engines, but also to engine oil degradation. Fuel components accumulated in the oil layer are transferred to the bulk in ring belt zones, after a measurable residence time. A significant difference in film thickness between the oil layer on the combustion‐chamber wall during the intake/compression sequence, as against the expansion/exhaust sequence, indicates that in the ring belt zones and above, engine oil viscosity, and hence load‐carrying capacity, is influenced by fuel absorption/desorption in the engine oil.