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Summary & Details

Particle Matter Index and Fuel Wall-wetting Relations on Stochastic Pre-ignition

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Format: PDF

Price: Non-members (tax incl.)：￥6,600 Members (tax incl.)：￥5,280

Paper/Info type: SAE Paper

No.2021-01-1163

Pages: 1-13(Total 13 p)

Date of publication: Sep 2021

Publisher: SAE International

Language: English

Event: SAE Powertrains, Fuels & Lubricants Digital Summit

Detailed Information

Author(E)	1) Vicente Boronat Colomer, 2) Derek Splitter, 3) Sneha Neupane, 4) William Partridge
Affiliation(E)	1) ORNL, 2) Oak Ridge National Laboratory, 3) Oak Ridge National Laboratory, 4) Oak Ridge National Laboratory
Abstract(E)	This work explores the effect of the particle matter index (PMI) and aromatic content on fuel wall impingement associated with stochastic pre-ignition (SPI). Statically significant measurements of SPI rates are directly coupled with laser induced florescence (LIF) measurements of fuel dilution from spray-linear impingement. Literature suggests that PMI is could be correlated with the number of SPI events, but the root cause(s) of PMI and SPI are directly causational or are a predicator of SPI. Three fuels have been used in this study with 3 different PMI and two different aromatic contents. The fuels are direct injected at two different injection timings, an earlier injection timing which initially targets the piston crown, 310°CA bTDC, and a later injection timing that the liner, 220°CA bTDC start of injection timings (SOI) respectively. The earlier 310 SOI injection increases soot, whereas the later 220°CA SOI targets the liner and increases wall-wetting. The findings of this work highlight that the SPI activity has a weak correlation with the soot promoted by the combustion process and increased PMI. However, SPI activity shows a strong dependency with high levels of oil dilution and aromatic content, suggesting that PMI might be an indicator of fuel chemistry conducive to SPI and the soot from increased PMI fuels is not a strong source of SPI relative to fuel wall wetting.

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