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    Characteristics of autoignited laminar lifted flames in heated coflow jets of carbon monoxide/hydrogen mixtures

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    Type
    Article
    Authors
    Choi, Byungchul
    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
    2012-06-01
    Permanent link to this record
    http://hdl.handle.net/10754/562216
    
    Metadata
    Show full item record
    Abstract
    The characteristics of autoignited lifted flames in laminar jets of carbon monoxide/hydrogen fuels have been investigated experimentally in heated coflow air. In result, as the jet velocity increased, the blowoff was directly occurred from the nozzle-attached flame without experiencing a stabilized lifted flame, in the non-autoignited regime. In the autoignited regime, the autoignited lifted flame of carbon monoxide diluted by nitrogen was affected by the water vapor content in the compressed air oxidizer, as evidenced by the variation of the ignition delay time estimated by numerical calculation. In particular, in the autoignition regime at low temperatures with added hydrogen, the liftoff height of the autoignited lifted flames decreased and then increased as the jet velocity increased. Based on the mechanism in which the autoignited laminar lifted flame is stabilized by ignition delay time, the liftoff height can be influenced not only by the heat loss, but also by the preferential diffusion between momentum and mass diffusion in fuel jets during the autoignition process. © 2012 The Korean Society of Mechanical Engineers.
    Citation
    Choi, B.-C., & Chung, S.-H. (2012). Characteristics of Autoignited Laminar Lifted Flames in Heated Coflow Jets of Carbon Monoxide/Hydrogen Mixtures. Transactions of the Korean Society of Mechanical Engineers B, 36(6), 639–646. doi:10.3795/ksme-b.2012.36.6.639
    Publisher
    The Korean Society of Mechanical Engineers
    Journal
    Transactions of the Korean Society of Mechanical Engineers B
    DOI
    10.3795/KSME-B.2012.36.6.639
    ae974a485f413a2113503eed53cd6c53
    10.3795/KSME-B.2012.36.6.639
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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