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    Intermediate temperature heat release in an HCCI engine fueled by ethanol/n-heptane mixtures: An experimental and modeling study

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    Type
    Article
    Authors
    Vuilleumier, David
    Kozarac, Darko cc
    Mehl, Marco
    Saxena, Samveg
    Pitz, William J.
    Dibble, Robert W. cc
    Chen, Jyhyuan
    Sarathy, Mani cc
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Chemical Engineering Program
    Clean Combustion Research Center
    Combustion and Pyrolysis Chemistry (CPC) Group
    Physical Science and Engineering (PSE) Division
    Date
    2014-03
    Permanent link to this record
    http://hdl.handle.net/10754/563419
    
    Metadata
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    Abstract
    This study examines intermediate temperature heat release (ITHR) in homogeneous charge compression ignition (HCCI) engines using blends of ethanol and n-heptane. Experiments were performed over the range of 0-50% n-heptane liquid volume fractions, at equivalence ratios 0.4 and 0.5, and intake pressures from 1.4bar to 2.2bar. ITHR was induced in the mixtures containing predominantly ethanol through the addition of small amounts of n-heptane. After a critical threshold, additional n-heptane content yielded low temperature heat release (LTHR). A method for quantifying the amount of heat released during ITHR was developed by examining the second derivative of heat release, and this method was then used to identify trends in the engine data. The combustion process inside the engine was modeled using a single-zone HCCI model, and good qualitative agreement of pre-ignition pressure rise and heat release rate was found between experimental and modeling results using a detailed n-heptane/ethanol chemical kinetic model. The simulation results were used to identify the dominant reaction pathways contributing to ITHR, as well as to verify the chemical basis behind the quantification of the amount of ITHR in the experimental analysis. The dominant reaction pathways contributing to ITHR were found to be H-atom abstraction from n-heptane by OH and the addition of fuel radicals to O2. © 2013 The Combustion Institute.
    Citation
    Vuilleumier, D., Kozarac, D., Mehl, M., Saxena, S., Pitz, W. J., Dibble, R. W., … Mani Sarathy, S. (2014). Intermediate temperature heat release in an HCCI engine fueled by ethanol/n-heptane mixtures: An experimental and modeling study. Combustion and Flame, 161(3), 680–695. doi:10.1016/j.combustflame.2013.10.008
    Sponsors
    Researchers at the King Abdullah University of Science and Technology acknowledge funding from the Clean Combustion Research Center and from Saudi Aramco under the FUELCOM program. The work at LLNL was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.
    Publisher
    Elsevier BV
    Journal
    Combustion and Flame
    DOI
    10.1016/j.combustflame.2013.10.008
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.combustflame.2013.10.008
    Scopus Count
    Collections
    Articles; Biological and Environmental Sciences and Engineering (BESE) Division; Physical Science and Engineering (PSE) Division; Chemical Engineering Program; Clean Combustion Research Center

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