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Original Articles

Oxidation of the Piston Crevice Hydrocarbon During the Expansion Process in a Spark Ignition Engine

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Pages 307-326 | Received 13 Jun 1994, Accepted 20 Mar 1995, Published online: 17 Apr 2007
 

Abstract

Engine-out HC emissions were measured in SI engine experiments in which the piston topland crevice size was changed systematically. For a warmed-up engine, the HC emissions were found to be modestly sensitive to the piston crevice size-a 10% change in size results in approximately a 2% change in HC emissions. This low sensitivity is explained in terms of a crevice HC diffusion/oxidation model in the expansion process. When the piston crevice is sufficienlly small, however, the model shows that the HC emissions have a one-to-one correspondence with the crevice size.

Notes

Corresponding author. 31-165 MIT, Cambridge, MA 02139-7430; Tel: (617)253-4531; Fax: (617)-253-9453.

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