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Impact of CO2 Dilution on Ignition Delay Times of Full Blend Gasolines in a Rapid Compression Machine

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Non-members (tax incl.)：￥6,600 Members (tax incl.)：￥5,280
Paper/Info type
SAE Paper

No.2021-01-1199

Pages
1-14(Total 14 p)
Date of publication
Sep 2021
Publisher
SAE International
Language
English
Event
SAE Powertrains, Fuels & Lubricants Digital Summit

Detailed Information

Author(E)1) Prasanna Chinnathambi, 2) Chaitanya Wadkar, 3) Soumya Gudiyella, 4) Fadi Estefanous, 5) Elisa Toulson
Affiliation(E)1) Michigan State University, 2) Michigan State University, 3) FCA US LLC, 4) FCA US LLC, 5) Michigan State University
Abstract(E)Autoignition delay times of two full blend gasoline fuels (high and low RON) were explored in a rapid compression machine. CO2 dilution by mass was introduced at 0%, 15%, and 30% levels with the O2:N2 mole ratio fixed at 1:3.76. This dilution strategy is used to represent exhaust gas recirculation (EGR) substitution in spark ignition (SI) engines by using CO2 as a surrogate for major EGR constituents(N2, CO2, H2O). Experiments were conducted over the temperature range of 650K-900K and at 10 bar and 20 bar compressed pressure conditions for equivalence ratios of (Φ =) 0.6-1.3. The full blend fuels were admitted directly into the combustion chamber for mixture preparation using the direct test chamber (DTC) approach. CO2 addition retarded the autoignition times for the fuels studied here. The retarding effect of the CO2 dilution was more pronounced in the NTC region when compared to the lower and higher temperature range. The effect of dilution was more pronounced for the higher RON fuel in comparison to the lower RON fuel. With CO2 dilution, ignition delay times of the low RON fuel matched the undiluted high RON fuel delay times showcasing octane relaxation potential. The ignition delay times of the gasoline fuels were compared with that of iso-octane, a major component in gasoline surrogates, at both diluted and undiluted conditions. The CO2 dilution did not affect the ignition delay curve of the fuels or iso-octane but rather shifted it horizontally, hence no significant chemical reactivity due to CO2 dilution was observed in this study.

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