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Effects of Secondary Air on the Exhaust Oxidation of Particulate Matters

Journal Article
2015-01-0886
ISSN: 1946-3936, e-ISSN: 1946-3944
DOI: https://doi.org/10.4271/2015-01-0886
Published April 14, 2015 by SAE International in United States
Effects of Secondary Air on the Exhaust Oxidation of Particulate Matters
Sector:
Citation: Pritchard, J. and Cheng, W., "Effects of Secondary Air on the Exhaust Oxidation of Particulate Matters," SAE Int. J. Engines 8(3):1088-1097, 2015, https://doi.org/10.4271/2015-01-0886.
Language: English

Abstract:

The effects of secondary air on the exhaust oxidation of particulate matters (PM) have been assessed in a direct-injection-spark-ignition engine under fuel rich fast idle condition (1200 rpm; 2 bar NIMEP). Substantial oxidation of the unburned feed gas species (CO and HC) and significant reduction of both the particulate number (up to ∼80%) and volume (up to ∼90%) have been observed. The PM oxidation is attributed to the reactions between the PM and the radicals generated in the oxidation of the feed gas unburned species. This hypothesis is supported by the observation that the reduction in PM volume is proportional to the amount of heat release in the secondary oxidation.

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