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    A Computational Assessment of Laminar Flame Speed Correlation in an Ultralean Prechamber Engine

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    Thesis_Final_Draft_Alkhamis.pdf
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    MS Thesis - Final PDF - Ghufran Alkhamis
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    Type
    Thesis
    Authors
    Alkhamis, Ghufran cc
    Advisors
    Im, Hong G. cc
    Committee members
    Turner, Jamie
    Sun, Shuyu cc
    Program
    Mechanical Engineering
    KAUST Department
    Physical Science and Engineering (PSE) Division
    Date
    2021-11
    Permanent link to this record
    http://hdl.handle.net/10754/673883
    
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    Abstract
    Predictive modeling of pre-chamber combustion engines relies primarily on the correct prediction of laminar and turbulent flame speeds. While the latter has been rigorously derived, the former correlations are mostly semi-empirical and valid for a limited range of operating conditions. The current work aims at highlighting the fundamental significance of correct laminar flame speed prediction on numerical modeling of ultralean prechamber engine combustion. Gulder's empirical correlation for laminar flame speed was chosen for the current work. It was modified for ranges beyond what it was originally derived for. It was initially observed that the numerical results that utilize Gulder's correlation for the laminar flame speed underperform compared to the one computed from the skeletal GRI3.0 by Lu and Law. In all cases, Peters' turbulent flame speed correlation was used, which evidences that any potential difference comes from the laminar flame speed. Using Lu and Law's chemical mechanism as a reference for laminar flame speed calculations, the values of the empirical constants α, η, and ξ in Gulder's correlation were optimized to yield more accurate flame speeds at ultralean engine conditions. The updated Gulder's correlation for methane was implemented in CONVERGE, a three-dimensional computational fluid dynamics (CFD) solver, and validated against the experimental engine results from KAUST. The flame topology was also explored to correlate the observed behaviors in the pressure predictions among all tested cases. Finally, the Borghi-Peters diagram provides insightful information on combustion regimes encountered in pre-chamber combustion engines.
    Citation
    Alkhamis, G. (2021). A Computational Assessment of Laminar Flame Speed Correlation in an Ultralean Prechamber Engine. KAUST Research Repository. https://doi.org/10.25781/KAUST-STFD8
    DOI
    10.25781/KAUST-STFD8
    ae974a485f413a2113503eed53cd6c53
    10.25781/KAUST-STFD8
    Scopus Count
    Collections
    MS Theses; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program

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