Correlation of nanoparticle size distribution features to spatiotemporal flame luminosity in gasoline direct injection engines

Jeon, Joonho; Bock, Noah; Kittelson, David B.; Northrop, William F.

doi:10.1177/1468087418798468

Correlation of nanoparticle size distribution features to spatiotemporal flame luminosity in gasoline direct injection engines

Journal Article · Wed Sep 12 00:00:00 EDT 2018 · International Journal of Engine Research

DOI:https://doi.org/10.1177/1468087418798468· OSTI ID:1807777

^[1]; Bock, Noah ^[2]; Kittelson, David B. ^[2]; Northrop, William F. ^[2]

Univ. of Minnesota, Minneapolis, MN (United States); University of Minnesota
Univ. of Minnesota, Minneapolis, MN (United States)

Particle size distribution measured by mobility instruments is a common diagnostic used to characterize ultrafine and nanoparticle emissions in engine exhaust; however, some features of particle size distribution data are poorly correlated to in-cylinder combustion phenomena. In this work, in-cylinder spatiotemporal flame luminosity is quantitatively correlated to features in the solid particle size distribution measured in the exhaust of a gasoline direct injection engine operating in lean and stoichiometric combustion modes. A multi-channel optical sensor was used to measure diffusion flame light intensity in different areas of the combustion chamber. Furthermore, total solid particle number and particle size distribution in the exhaust were measured using a scanning mobility particle sizer after a catalytic stripper that removed semi-volatile compounds. Results of the experiments showed that different flame phenomenon resulted in distinct particle size distribution characteristics. A large accumulation mode (particles with diameter of 50–100 nm) in the particle size distribution from stoichiometric engine operation with early injection resulted from anomalous diffusion flames like piston-top pool fires. In lean operation incorporating a secondary fuel injection, particle emissions were dominated by flame propagation through fuel-rich regions of the combustion chamber resulting in a comparatively broad particle size distribution. More generally, this work illustrates how particle size distribution data can be more accurately used to diagnose soot formation in gasoline direct injection engines.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Minnesota, Minneapolis, MN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office

Grant/Contract Number:: EE0007217

OSTI ID:: 1807777

Journal Information:: International Journal of Engine Research, Journal Name: International Journal of Engine Research Journal Issue: 7 Vol. 21; ISSN 1468-0874

Publisher:: SAGECopyright Statement

Country of Publication:: United States

Language:: English

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Correlation of nanoparticle size distribution features to spatiotemporal flame luminosity in gasoline direct injection engines

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