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    Decreasing liftoff height behavior in diluted laminar lifted methane jet flames

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    Type
    Article
    Authors
    Van, Kyuho
    Jung, Ki Sung
    Yoo, Chun Sang
    Oh, Soohyun
    Lee, Byeong Jun
    Cha, Min Suk cc
    Park, Jeong
    Chung, Suk Ho cc
    KAUST Department
    Clean Combustion Research Center
    Combustion and Laser Diagnostics Laboratory
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2019
    Online Publication Date
    2018-06-22
    Print Publication Date
    2018-06
    Permanent link to this record
    http://hdl.handle.net/10754/630497
    
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    Abstract
    Stabilization of laminar lifted coflow jet flames of nitrogen-diluted methane was investigated experimentally and numerically. As the fuel jet velocity was increased, two distinct behaviors in liftoff height were observed depending on the initial fuel mole fraction; a monotonically increasing trend and a decreasing and then increasing trend (U-shaped behavior). The former was observed in the jet-developing region and the latter in the jet-developed region. Because the decreasing behavior of liftoff height with jet velocity has not been observed at ambient temperature, the present study focuses on decreasing liftoff height behavior. To elucidate the physical mechanism underlying the U-shaped behavior, numerical simulations of reacting jets were conducted by adopting a skeletal mechanism. The U-shaped behavior was related to the buoyancy. At small jet velocities, the relative importance of the buoyancy over convection was strong and the flow field was accelerated in the downstream region to stabilize the lifted flame. As the jet velocity increased, the relative importance of buoyancy decreased and the liftoff height decreased. As the jet velocity further increased, the flame stabilization was controlled by jet momentum and the liftoff height increased.
    Citation
    Van K, Jung KS, Yoo CS, Oh S, Lee BJ, et al. (2018) Decreasing liftoff height behavior in diluted laminar lifted methane jet flames. Proceedings of the Combustion Institute. Available: http://dx.doi.org/10.1016/j.proci.2018.05.031.
    Sponsors
    This work was supported by the National Research Council of Science and Technology (NST) grant by the Korea government (MSIP) No. CRC-14-01-ETRI. MSC and SHC were supported by Clean Combustion Research Center (CCRC), King Abdullah University of Science and Technology (KAUST).
    Publisher
    Elsevier BV
    Journal
    Proceedings of the Combustion Institute
    DOI
    10.1016/j.proci.2018.05.031
    Additional Links
    http://www.sciencedirect.com/science/article/pii/S1540748918300324
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.proci.2018.05.031
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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