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    A numerical study of the auto-ignited laminar lifted methane/hydrogen mixtures in heated co-flow air

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    Type
    Conference Paper
    Authors
    Jung, Ki Sung
    Kim, Seung Ook
    Lee, Bok Jik
    Chung, Suk Ho cc
    Yoo, Chun Sang
    KAUST Department
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2017-01-01
    Permanent link to this record
    http://hdl.handle.net/10754/666785
    
    Metadata
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    Abstract
    In the present study, the liftoff characteristics of a laminar HCNG flame are investigated using 2-D numerical simulations by varying the fuel jet velocity. It is observed that the liftoff height decreases with increasing fuel jet velocity. Gradual transition from the tribrachial flame to the MILD combustion is also observed. From both Da analysis and transport budget analysis, it is verified that auto-ignition is the main stabilization mechanism of the lifted flame. Additional simulations are carried out with modified hydrogen diffusivity, showing that the decrease of liftoff height is mainly attributed to the high diffusivity of hydrogen molecule. Preferential diffusion effect of hydrogen is clarified by revising the ignition delay time term in the liftoff height relation. It is also shown that the revised ignition delay time increases as the fuel jet velocity decreases since hydrogen ratio RH decreases at the upstream of flame front with decreasing fuel jet velocity. The high diffusive nature of hydrogen molecule increases the ignition delay time at lower fuel jet velocity, which, in turn, leads to the increase of the liftoff height.
    Publisher
    Combustion Institute
    Conference/Event name
    11th Asia-Pacific Conference on Combustion, ASPACC 2017
    Additional Links
    https://www.researchgate.net/profile/Chun_Sang_Yoo/publication/322065189_A_numerical_study_of_the_auto-ignited_laminar_lifted_methanehydrogen_mixtures_in_heated_co-flow_air/links/5af165f9aca272bf4255b80f/A-numerical-study-of-the-auto-ignited-laminar-lifted-methane-hydrogen-mixtures-in-heated-co-flow-air.pdf
    Collections
    Conference Papers; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program

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