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    Explosive dynamics of bluff-body-stabilized lean premixed hydrogen flames at blow-off

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    1_PROCI-D-19-00293R1.pdf
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    4.970Mb
    Format:
    PDF
    Description:
    Accepted manuscript
    Embargo End Date:
    2022-09-19
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    Type
    Article
    Authors
    Kim, Yu Jeong
    Song, Wonsik
    Hernandez Perez, Francisco
    Im, Hong G. cc
    KAUST Department
    Clean Combustion Research Center
    Computational Reacting Flow Laboratory (CRFL)
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2020-09-19
    Online Publication Date
    2020-09-19
    Print Publication Date
    2020-09
    Embargo End Date
    2022-09-19
    Submitted Date
    2019-11-07
    Permanent link to this record
    http://hdl.handle.net/10754/665336
    
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    Abstract
    Two-dimensional direct numerical simulation (DNS) databases of bluff-body-stabilized lean hydrogen flames representative of complicated reactive–diffusive system are analysed using the combined approach of computational singular perturbation (CSP) and tangential stretching rate (TSR) to investigate chemical characteristics in blow-off dynamics. To assess the diagnostic approaches in flame and blow-off dynamics, Damköhler number and TSR variables are applied and compared. Four cases are considered in this study showing different flame dynamics such as the steadily stable mode, local extinction by asymmetric vortex shedding, convective blow-off and lean blow-out. DNS data points in positive explosive eigenvalue conditions were subdivided into four different combinations in TSR and extended TSR space and categorized in four distinct characteristic regions, such as kinetically explosive or dissipative and transport-enhanced or dissipative dynamics. The TSR analysis clearly captures the local extinction point in the complicated vortex shedding and allows an improved understanding of the distinct chemistry-transport interactions occurring in convective blow-off and lean blow-out events.
    Citation
    Kim, Y. J., Song, W., Hernández Pérez, F. E., & Im, H. G. (2020). Explosive dynamics of bluff-body-stabilized lean premixed hydrogen flames at blow-off. Proceedings of the Combustion Institute. doi:10.1016/j.proci.2020.06.071
    Sponsors
    This work was sponsored by King Abdullah University of Science and Technology (KAUST). Computational resources were provided by the KAUST Supercomputing Laboratory (KSL). The authors would like to thank Professor Mauro Valorani and his group at Sapienza University of Rome for providing the CSP analysis tools.
    Publisher
    Elsevier BV
    Journal
    Proceedings of the Combustion Institute
    DOI
    10.1016/j.proci.2020.06.071
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S1540748920301267
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.proci.2020.06.071
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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