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    A numerical study of the autoignited laminar DME lifted jet flames in heated coflow air

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    Type
    Conference Paper
    Authors
    Jung, Ki Sung
    Jung, Ba Reum
    Chung, Suk Ho cc
    Yoo, Chun Sang
    KAUST Department
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2019-01-01
    Permanent link to this record
    http://hdl.handle.net/10754/666449
    
    Metadata
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    Abstract
    The liftoff characteristics of autoignited laminar dimethyl ether (DME) jet flames in heated coflow air is numerically investigated with openFOAM-based laminar reacting flow solver, laminarSMOKE. According to a previous experimental study on autoignited laminar DME jet flame, decreasing liftoff height trend of the lifted jet flames is observed with the increase of fuel jet velocity at relatively-low jet velocities. To understand the unusual liftoff characteristics of the autoignited Lifted DME jet flames, various numerical simulations have been carried out. From additional simulations with modified mass diffusivity of hydrogen, it is found that the decreasing liftoff height behavior is mainly attributed to the high diffusive nature of hydrogen molecule, which is generated by the DME pyrolysis. The temperature profile along the streamline passing through the flamebase shows that actual autoignition delay time deviates from the 0-D ignition delay time trend due to the preferential diffusion effect of hydrogen molecule, leading to the decreasing HL behavior.
    Sponsors
    This work 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).
    Publisher
    Combustion Institute
    Conference/Event name
    12th Asia-Pacific Conference on Combustion, ASPACC 2019
    Additional Links
    http://www.combustionsociety.jp/aspacc19/program_final0711.html#CH0238
    Collections
    Conference Papers; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program

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