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    Effects of Differential Diffusion on the Stabilization of Unsteady Lean Premixed Flames Behind a Bluff-Body

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    Name:
    APPL-D-19-00352R2.pdf
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    5.392Mb
    Format:
    PDF
    Description:
    Accepted manuscript
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    Type
    Article
    Authors
    Kim, Yu Jeong cc
    Lee, Bok Jik
    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
    2020-09-29
    Online Publication Date
    2020-09-29
    Print Publication Date
    2021-04
    Embargo End Date
    2021-09-29
    Submitted Date
    2019-12-13
    Permanent link to this record
    http://hdl.handle.net/10754/665375
    
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    Abstract
    Two-dimensional direct numerical simulations were conducted to investigate the effects of differential diffusion on flame stabilization and blow-off dynamics of lean premixed hydrogen–air and syngas–air flames stabilized on a meso-scale bluff-body in a square channel. The unity Lewis number for all species was imposed to isolate the effects of differential diffusion. Four sets of simulation cases were conducted. Two different inflow temperature with unity Lewis number were applied to examine distinct levels of hydrodynamic instability. Each unity Lewis number case was compared with the non-unity Lewis number case to investigate how differential diffusion affects the overall flame responses, instabilities, and blow-off mechanism. For all cases, the overall flame dynamics were observed in several distinct modes as the inflow velocity approaches blow-off limit. One of the primary effects of unity Lewis number was an increased level of hydrodynamic instability due to the lower flame temperature and thus a lower density ratio. The lower gas temperature also led to a weakening of the re-ignition of the quenched local mixture by the product gas entrainment. The combined effects were manifested as suppression of the re-ignition events, leading to a revised conclusion that the ultimate blow-off behavior at high velocity conditions are mainly controlled by the onset of local extinction.
    Citation
    Kim, Y. J., Lee, B. J., & Im, H. G. (2020). Effects of Differential Diffusion on the Stabilization of Unsteady Lean Premixed Flames Behind a Bluff-Body. Flow, Turbulence and Combustion. doi:10.1007/s10494-020-00217-y
    Sponsors
    This work was sponsored by King Abdullah University of Science and Technology (KAUST). Computational resources were provided by the KAUST Supercomputing Laboratory (KSL). BJL was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry and Energy (MOTIE) of the Republic of Korea (Grant No. 20181110100290).
    YJK and HGI were funded by King Abdullah University of Science and Technology (no grant number). BJL was sponsored by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry and Energy (MOTIE) of the Republic of Korea (Grant No. 20181110100290).
    Publisher
    Springer Nature
    Journal
    Flow, Turbulence and Combustion
    DOI
    10.1007/s10494-020-00217-y
    Additional Links
    http://link.springer.com/10.1007/s10494-020-00217-y
    ae974a485f413a2113503eed53cd6c53
    10.1007/s10494-020-00217-y
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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