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    Estimating fuel octane numbers from homogeneous gas-phase ignition delay times

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    cnf_ron_mon_idt.pdf
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    Type
    Article
    Authors
    Naser, Nimal cc
    Sarathy, Mani cc
    Chung, Suk Ho cc
    KAUST Department
    Chemical Engineering Program
    Clean Combustion Research Center
    Combustion and Laser Diagnostics Laboratory
    Combustion and Pyrolysis Chemistry (CPC) Group
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2017-11-05
    Online Publication Date
    2017-11-05
    Print Publication Date
    2018-02
    Permanent link to this record
    http://hdl.handle.net/10754/626595
    
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    Abstract
    Fuel octane numbers are directly related to the autoignition properties of fuel/air mixtures in spark ignition (SI) engines. This work presents a methodology to estimate the research and the motor octane numbers (RON and MON) from homogeneous gas-phase ignition delay time (IDT) data calculated at various pressures and temperatures. The hypothesis under investigation is that at specific conditions of pressure and temperature (i.e., RON-like and MON-like conditions), fuels with IDT identical to that of a primary reference fuel (PRF) have the same octane rating. To test this hypothesis, IDTs with a detailed gasoline surrogate chemical kinetic model have been calculated at various temperatures and pressures. From this dataset, temperatures that best represent RON and MON have been correlated at a specified pressure. Correlations for pressures in the range of 10–50 bar were obtained. The proposed correlations were validated with toluene reference fuels (TRF), toluene primary reference fuels (TPRF), ethanol reference fuels (ERF), PRFs and TPRFs with ethanol, and multi-component gasoline surrogate mixtures. The predicted RON and MON showed satisfactory accuracy against measurements obtained by the standard ASTM methods and blending rules, demonstrating that the present methodology can be a viable tool for a first approximation. The correlations were also validated against an extensive set of experimental IDT data obtained from literature with a high degree of accuracy in RON/MON prediction. Conditions in homogeneous reactors such as shock tubes and rapid compression machines that are relevant to modern SI engines were also identified. Uncertainty analysis of the proposed correlations with linear error propagation theory is also presented.
    Citation
    Naser N, Sarathy SM, Chung SH (2018) Estimating fuel octane numbers from homogeneous gas-phase ignition delay times. Combustion and Flame 188: 307–323. Available: http://dx.doi.org/10.1016/j.combustflame.2017.09.037.
    Sponsors
    The research reported in this paper was funded by Saudi Aramco and the Clean Combustion Research Center at King Abdullah University of Science and Technology under the FUELCOM program.
    Publisher
    Elsevier BV
    Journal
    Combustion and Flame
    DOI
    10.1016/j.combustflame.2017.09.037
    Additional Links
    http://www.sciencedirect.com/science/article/pii/S0010218017303759
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.combustflame.2017.09.037
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Chemical Engineering Program; Mechanical Engineering Program; Clean Combustion Research Center

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