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    Effects of Schmidt number on non-monotonic liftoff height behavior in laminar coflow-jet flames with diluted methane and ethylene

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    Name:
    Symp_revised paper_unmarked.pdf
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    1.336Mb
    Format:
    PDF
    Description:
    Accepted manuscript
    Embargo End Date:
    2022-09-08
    Download
    Type
    Article
    Authors
    Van, Kyu Ho
    Oh, Su Hyeon cc
    Cha, Min Suk cc
    Yoo, Chun Sang cc
    Park, Jeong
    Chung, Suk Ho cc
    KAUST Department
    Combustion and Laser Diagnostics Laboratory
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2020-09-08
    Online Publication Date
    2020-09-08
    Print Publication Date
    2020-09
    Embargo End Date
    2022-09-08
    Submitted Date
    2019-11-02
    Permanent link to this record
    http://hdl.handle.net/10754/665062
    
    Metadata
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    Abstract
    Stabilization characteristics of laminar lifted jet flames in a coflow were investigated experimentally to elucidate the effect of Schmidt number in methane and ethylene fuels diluted with N 2 , He, and Ar. A non- monotonic (decreasing and then increasing) liftoff height ( H L ) behavior with jet velocity ( U 0 ) was observed previously for methane fuel diluted with N 2 . To further elucidate the fuel Schmidt number (Sc F ) effect in exhibiting such a non-monotonic (U-shaped) behavior, various diluents (N 2 , He, and Ar) were added to the fuel streams and methane and/or ethylene fuels were used. The result showed three flame types in terms of Sc F and fuel density; nozzle-attached flame, stationary lifted flame, and oscillating flame. Among sta- tionary lifted flames, two distinct H L behaviors with U 0 were observed; monotonic and non-monotonic H L behaviors. A critical Schmidt number (Sc F,cr1 ) existed over which monotonically increasing behavior was ob- served. A second critical Schmidt number (Sc F,cr2 ) also existed such that U-shaped behavior was observed for Sc F,cr2 < Sc F < Sc F,cr1 . An oscillating lifted flame was observed for Sc F < Sc F,cr2 . The oscillating and stationary lifted flames can be categorized in terms of the density differences among the fuel, air, and burnt gas. For the increasing H L cases (including the increasing regime in U-shaped behavior), H L behavior can be char- acterized in terms of Sc F , the density difference between fuel and air, Sc F,cr1 , and U 0 . While the decreasing H L regime in the U-shaped behavior can be characterized with Sc F and/or the Richardson number (defined based on the density difference between fuel and air). Oscillating flames were observed with the frequency range of 2.1–2.7 Hz by the repetitive action of positive (by burnt gas) and negative (when the fuel heavier than air) buoyancies.
    Citation
    Van, K. H., Oh, S. H., Cha, M. S., Yoo, C. S., Park, J., & Chung, S. H. (2020). Effects of Schmidt number on non-monotonic liftoff height behavior in laminar coflow-jet flames with diluted methane and ethylene. Proceedings of the Combustion Institute. doi:10.1016/j.proci.2020.06.344
    Sponsors
    This work was conducted under the framework of the Research and Development Program of the Korea Institute of Energy Research (B9-2431). CSY was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (NRF-2018R1A2A2A05018901). SHC & MSC were supported by the King Abdullah University of Science and Technology (KAUST).
    Publisher
    Elsevier BV
    Journal
    Proceedings of the Combustion Institute
    DOI
    10.1016/j.proci.2020.06.344
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S1540748920304375
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.proci.2020.06.344
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program

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