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    Alternating currents enhanced pahs formation in nonpremixed jet flames

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    Type
    Conference Paper
    Authors
    Xiong, Y.
    Cha, Min Suk cc
    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
    2014-12-16
    Embargo End Date
    2015-12-16
    Permanent link to this record
    http://hdl.handle.net/10754/664496
    
    Metadata
    Show full item record
    Abstract
    In laminar nonpremixed propane jet flames, it was found that alternating current (AC) electric fields applied to a jet nozzle could decrease flame yellow luminosity significantly. Planar laser-induced fluorescence (PLIF) showed polycyclic aromatic hydrocarbons (PAHs) started to form near the nozzle exit, and the concentration of PAHs increased around 30 times with the AC electric fields. The variations in PAHs were much sensitive to the applied voltage than the frequency of AC. Elastic scattering of an UV laser indicated that a toroidal vortex was formed near the nozzle with AC. Due to the recirculating nature of a vortex, generated heat from combustion was accumulated inside the vortex, thus it provided a favorable reaction environment to PAHs to form. Through a particle image velocimetry (PIV), we found that reduction in effective cross-section of fuel jet due to the existence of the toroidal vortex resulted in the increase of local fuel velocity near nozzle exit. Consequent reduced flow residence time acted negatively for soot to form, thus decreased in flame luminosity can be explained. The onset conditions for the vortex were measured with different fuel velocities. The critical conditions can be correlated with the applied voltage and frequency in the form of V a×f = constant. Since the coefficient a was around 2, it confirms stronger dependence of applied voltage rather than AC frequency.
    Citation
    XIONG, Y., Cha, M. S., & Chung, S. H. (2014). Alternating Currents Enhanced PAHs Formation in Nonpremixed Jet Flames. Proceedings of the 15th International Heat Transfer Conference. doi:10.1615/ihtc15.cmb.009466
    Sponsors
    This work was supported by a KAUST-AEA project
    Publisher
    Begellhouse
    Conference/Event name
    15th International Heat Transfer Conference, IHTC 2014
    ISBN
    9781567004212
    DOI
    10.1615/ihtc15.cmb.009466
    Additional Links
    http://www.ihtcdigitallibrary.com/conferences/ihtc15,08fa4b120d76fe39,77700fd9189cee98.html
    ae974a485f413a2113503eed53cd6c53
    10.1615/ihtc15.cmb.009466
    Scopus Count
    Collections
    Conference Papers; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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