Fuel injection into the negative valve overlap (NVO) period is a common method for controlling combustion phasing in homogeneous charge compression ignition (HCCI) as well as other forms of advanced combustion. During this event, at least a portion of the fuel hydrocarbons can be converted to products containing significant levels of H2 and CO, as well as other short chain hydrocarbons by means of thermal cracking, watergas shift, and partial oxidation reactions, depending on the availability of oxygen and the time-temperature-pressure history. The resulting products alter the autoignition properties of the combined fuel mixture for HCCI. Fuel-rich chemistry in a partial oxidation environment is also relevant to other high efficiency engine concepts (e.g., the dedicated EGR (D-EGR) concept from SWRI). In this study, we used a unique 6-stroke engine cycle to experimentally investigate the chemistry of a range of fuels injected during NVO under low oxygen conditions. Fuels investigated included iso-octane, iso-butanol, ethanol, and methanol. Products from NVO chemistry were highly dependent on fuel type and injection timing, with iso-octane producing less than 1.5% hydrogen and methanol producing more than 8%. We compare the experimental trends with CHEMKIN (single zone, 0-D model) predictions using multiple kinetic mechanisms available in the current literature. Our primary conclusion is that the kinetic mechanisms investigated are unable to accurately predict the magnitude and trends of major species we observed.
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ASME 2013 Internal Combustion Engine Division Fall Technical Conference
October 13–16, 2013
Dearborn, Michigan, USA
Conference Sponsors:
- Internal Combustion Engine Division
ISBN:
978-0-7918-5610-9
PROCEEDINGS PAPER
In-Cylinder Reaction Chemistry and Kinetics During Negative Valve Overlap Fuel Injection Under Low-Oxygen Conditions
Vickey B. Kalaskar,
Vickey B. Kalaskar
Pennsylvania State University, State College, PA
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James P. Szybist,
James P. Szybist
Oak Ridge National Laboratory, Oak Ridge, TN
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Derek A. Splitter,
Derek A. Splitter
Oak Ridge National Laboratory, Oak Ridge, TN
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Josh A. Pihl,
Josh A. Pihl
Oak Ridge National Laboratory, Oak Ridge, TN
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Zhiming Gao,
Zhiming Gao
Oak Ridge National Laboratory, Oak Ridge, TN
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C. Stuart Daw
C. Stuart Daw
Oak Ridge National Laboratory, Oak Ridge, TN
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Vickey B. Kalaskar
Pennsylvania State University, State College, PA
James P. Szybist
Oak Ridge National Laboratory, Oak Ridge, TN
Derek A. Splitter
Oak Ridge National Laboratory, Oak Ridge, TN
Josh A. Pihl
Oak Ridge National Laboratory, Oak Ridge, TN
Zhiming Gao
Oak Ridge National Laboratory, Oak Ridge, TN
C. Stuart Daw
Oak Ridge National Laboratory, Oak Ridge, TN
Paper No:
ICEF2013-19230, V002T02A017; 15 pages
Published Online:
February 26, 2014
Citation
Kalaskar, VB, Szybist, JP, Splitter, DA, Pihl, JA, Gao, Z, & Daw, CS. "In-Cylinder Reaction Chemistry and Kinetics During Negative Valve Overlap Fuel Injection Under Low-Oxygen Conditions." Proceedings of the ASME 2013 Internal Combustion Engine Division Fall Technical Conference. Volume 2: Fuels; Numerical Simulation; Engine Design, Lubrication, and Applications. Dearborn, Michigan, USA. October 13–16, 2013. V002T02A017. ASME. https://doi.org/10.1115/ICEF2013-19230
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