Low load carbon monoxide (CO) and unburned hydrocarbon (UHC) emissions sources are examined in an optically accessible, light-duty diesel engine employing a late-injection, low-temperature combustion strategy. The study focus is to identify the cause of the rapid degradation in emissions and efficiency as injection timing is retarded. The in-cylinder progression of mixing and combustion processes is examined through ultraviolet planar laser-induced fluorescence (UV PLIF) imaging of hydrocarbon spatial distributions. Spectrally-resolved, deep-UV LIF measurements are also used to construct late-cycle spatial distributions of CO, C2, and polycyclic aromatic hydrocarbons within the clearance volume. Engine-out emissions measurements and numerical results from both detailed chemistry homogeneous reactor and multidimensional simulations complement the measurements. The measured spatial distributions show that while most fuel accumulates on the bowl-pip during high-temperature heat-release, much of it is transported into the squish-volume by the reverse squish flow. Homogeneous reactor simulations further show that expansion cooling quenches reactions, preventing the transition to high-temperature heat-release for mixtures with an equivalence ratio below 0.6. Lean squish-volume mixtures, coupled with wall heat losses, severely inhibit squish volume fuel oxidation. Further retarding injection timing exacerbates quenching, resulting in a two-fold increase in UHC emissions and a 33% increase in CO, primarily from the squish-volume.
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ASME 2009 Internal Combustion Engine Division Fall Technical Conference
September 27–30, 2009
Lucerne, Switzerland
Conference Sponsors:
- Internal Combustion Engine Division
ISBN:
978-0-7918-4363-5
PROCEEDINGS PAPER
UHC and CO Emissions Sources From a Light-Duty Diesel Engine Undergoing Late-Injection Low-Temperature Combustion Available to Purchase
Isaac W. Ekoto,
Isaac W. Ekoto
Sandia National Laboratories, Livermore, CA
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William F. Colban,
William F. Colban
Sandia National Laboratories, Livermore, CA
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Paul C. Miles,
Paul C. Miles
Sandia National Laboratories, Livermore, CA
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O¨ivind Andersson,
O¨ivind Andersson
Lund University, Lund, Sweden
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Sung Wook Park,
Sung Wook Park
University of Wisconsin, Madison, WI
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David E. Foster,
David E. Foster
University of Wisconsin, Madison, WI
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Rolf D. Reitz
Rolf D. Reitz
University of Wisconsin, Madison, WI
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Isaac W. Ekoto
Sandia National Laboratories, Livermore, CA
William F. Colban
Sandia National Laboratories, Livermore, CA
Paul C. Miles
Sandia National Laboratories, Livermore, CA
Ulf Aronsson
Lund University, Lund, Sweden
O¨ivind Andersson
Lund University, Lund, Sweden
Sung Wook Park
University of Wisconsin, Madison, WI
David E. Foster
University of Wisconsin, Madison, WI
Rolf D. Reitz
University of Wisconsin, Madison, WI
Paper No:
ICEF2009-14030, pp. 163-172; 10 pages
Published Online:
July 8, 2010
Citation
Ekoto, IW, Colban, WF, Miles, PC, Aronsson, U, Andersson, O, Park, SW, Foster, DE, & Reitz, RD. "UHC and CO Emissions Sources From a Light-Duty Diesel Engine Undergoing Late-Injection Low-Temperature Combustion." Proceedings of the ASME 2009 Internal Combustion Engine Division Fall Technical Conference. ASME 2009 Internal Combustion Engine Division Fall Technical Conference. Lucerne, Switzerland. September 27–30, 2009. pp. 163-172. ASME. https://doi.org/10.1115/ICEF2009-14030
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