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    The Role of Intermediate-Temperature Heat Release in Octane Sensitivity of Fuels with Matching Research Octane Number

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    Revision_V2_Clean.pdf
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    Accepted manuscript
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    Type
    Article
    Authors
    Singh, Eshan cc
    Sarathy, Mani cc
    KAUST Department
    Biological and Environmental Science and Engineering (BESE) Division
    Chemical Engineering Program
    Clean Combustion Research Center
    Combustion and Pyrolysis Chemistry (CPC) Group
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2021-02-16
    Online Publication Date
    2021-02-16
    Print Publication Date
    2021-03-04
    Embargo End Date
    2022-02-16
    Submitted Date
    2020-11-17
    Permanent link to this record
    http://hdl.handle.net/10754/667491
    
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    Abstract
    Improving the efficiency of internal combustion engines is important for reducing global greenhouse gas emissions; the efficiency of spark ignition (SI) engines is limited by the knock phenomenon. As opposed to naturally aspirated engines, turbocharged engines operate at beyond research octane number (RON) conditions, and fuel octane sensitivity (OS = RON – motor octane number (MON)) becomes important under such conditions. Previous work by this group [ Energy Fuels 2017, 31, 1945−1960, DOI: 10.1021/acs.energyfuels.6b02659] elucidated the chemical kinetic origins of OS; this study is extended to provide a qualitative, as well as quantitative, definition of OS, based on fundamental ignition markers. A varying amount of toluene is blended with various primary reference fuels to match the ignition delay of the targeted research octane number fuels, allowing a range of octane sensitivities for each research octane number. This study establishes a correlation between OS and heat release rates at low, intermediate, and high temperatures. The significance and chemical origins of intermediate-temperature heat release in defining the OS of toluene blended in a mixture of iso-octane and n-heptane is also clarified. For the toluene–iso-octane–n-heptane mixtures considered here, low-temperature reactivity was not found to be a key marker of OS. The results also show areas of improved efficiency in beyond RON operating conditions, where high-sensitivity fuels could be beneficial.
    Citation
    Singh, E., & Sarathy, S. M. (2021). The Role of Intermediate-Temperature Heat Release in Octane Sensitivity of Fuels with Matching Research Octane Number. Energy & Fuels. doi:10.1021/acs.energyfuels.0c03883
    Sponsors
    This work was supported by King Abdullah University of Science and Technology (KAUST) with funds allocated to the Clean Combustion Research Center. We gratefully acknowledge contributions from the KAUST Clean Fuels Consortium (KCFC) and its member companies.
    Publisher
    American Chemical Society (ACS)
    Journal
    Energy & Fuels
    DOI
    10.1021/acs.energyfuels.0c03883
    Additional Links
    https://pubs.acs.org/doi/10.1021/acs.energyfuels.0c03883
    ae974a485f413a2113503eed53cd6c53
    10.1021/acs.energyfuels.0c03883
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Physical Science and Engineering (PSE) Division; Chemical Engineering Program; Mechanical Engineering Program; Clean Combustion Research Center

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