In-cylinder measurements of soot production in a direct-injection diesel engine

David B Kittelson, Michael J. Pipho, Jeffrey L. Ambs, Lang Luo

Research output: Contribution to conferencePaperpeer-review


In-cylinder and exhaust soot mass measurements have been made on a single-cylinder conversion of a 4-cylinder, 2.8 1, high-swirl, direct-injection diesel engine using a sampling system which allows dumping, diluting, quenching, and collecting the entire contents of the cylinder on a time scale o£ about 1 ms. Experiments have been performed at engine speeds of 1,000 and 1,500, and equivalence ratios, φ, of 0.4 and 0.7. Soot mass first appears shortly after top dead center and reaches a peak between 15 and 30 crankangle degrees after top dead center (CAD ATDC). After reaching its peak value, soot concentration decreases with increasing crankangle and approaches exhaust levels by 40-60 CAD ATDC. The time lag between the start of combustion and the first appearance of soot increases with φ and ranges from 0.2 to 1 ms. The initial rate of soot formation ranges from 0.26 to 0.30 mg ms-1 and varies little with speed or φ. The peak in-cylinder soot concentration only increases slightly (less than 20%) with φ. On the other hand, at φ = 0.4, oxidation reduces the exhaust soot concentration to roughly 15% of the peak in-cylinder value, while at φ = 0.7, oxidation is much less effective and the exhaust soot concentration is 60-80% of the peak value. It appears that oxygen availability late in the cycle is a critical factor in determining exhaust soot concentrations of this engine.

Original languageEnglish (US)
StatePublished - Dec 1 1988
EventInternational Congress and Exposition - Detroit, MI, United States
Duration: Feb 29 1988Mar 4 1988


OtherInternational Congress and Exposition
Country/TerritoryUnited States
CityDetroit, MI


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