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    On the universality of ignition delay times of distillate fuels at high temperatures: A statistical approach

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    High_T_IDT_version11.pdf
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    Description:
    Accepted manuscript
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    Type
    Article
    Authors
    KHALED, Fethi cc
    Farooq, Aamir cc
    KAUST Department
    Chemical Kinetics & Laser Sensors Laboratory
    Clean Combustion Research Center
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2019-08-31
    Online Publication Date
    2019-08-31
    Print Publication Date
    2019-12
    Permanent link to this record
    http://hdl.handle.net/10754/656828
    
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    Abstract
    Ignition delay times (IDTs) of fuels provide very important macro-information about the fuel reactivity and autoignition behavior. IDTs constitute a key metric for fuel/engine co-optimization studies. Chemical kinetic modeling pursuits rely on experimental IDTs as their primary validation target. There have been extensive works in literature on measuring, calculating, modeling and correlating IDTs of a wide range of hydrocarbons, oxygenates, mixtures of pure components and real fuels. Recently, some studies employed a simplified ignition model at high temperatures, comprising of a fast fuel decomposition step and a rate-determining small molecule oxidation step. This description suggests that high-temperature IDT is mainly controlled by the ignition of fuel fragments and is rather weakly dependent on the initial fuel composition. In this work, we study the validity of the hypothesis that IDT of multi-component fuels is weakly dependent on fuel composition under specific thermodynamic conditions. If so, high-temperature IDTs of practical fuels may be described by a universal Arrhenius type correlation. By combining experimental observations and chemical kinetic simulations, we determine the ranges of key parameters (temperature, pressure, equivalence ratio, composition) under which a universal IDT assumption is valid. We conclude that, for fairly random composition and within a P-T-ϕ constraint, IDTs of gasolines and jet fuels may be predicted with a high degree of certainty by the following modified Arrhenius expressions (P = 10–80 bar, P0 = 1 bar, ϕ = 0.5–2, fuel/air mixtures, units are ms, bar, K, mol, kcal): τgasoline=6.76*10−7( [Formula presented] )−1.01φ1.13− [Formula presented] exp( [Formula presented] ), forT> [Formula presented] τjetfuel=4.46*10−7( [Formula presented] )−1.21φ2.04− [Formula presented] *exp( [Formula presented] ), forT> [Formula presented]
    Citation
    Khaled, F., & Farooq, A. (2019). On the universality of ignition delay times of distillate fuels at high temperatures: A statistical approach. Combustion and Flame, 210, 145–158. doi:10.1016/j.combustflame.2019.08.026
    Sponsors
    Research reported in this work was funded by King Abdullah University of Science and Technology (KAUST). We are thankful to Prof. Omar Knio (CEMSE Division, KAUST) for helpful discussion on random numbers.
    Publisher
    Elsevier BV
    Journal
    Combustion and Flame
    DOI
    10.1016/j.combustflame.2019.08.026
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S001021801930389X
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.combustflame.2019.08.026
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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