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    Stabilization and structure of N-heptane flame on CWJ-spray burner with kHZ SPIV and OH-PLIF

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    1-s2.0-S0894177715002307-main.pdf
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    Type
    Article
    Authors
    Mansour, Morkous S. cc
    Al Khesho, Issam
    Chung, Suk Ho cc
    KAUST Department
    Clean Combustion Research Center
    Date
    2015-08-31
    Online Publication Date
    2015-08-31
    Print Publication Date
    2016-05
    Permanent link to this record
    http://hdl.handle.net/10754/576856
    
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    Abstract
    A curved wall-jet (CWJ) burner was employed to stabilize turbulent spray flames that utilized a Coanda effect by supplying air as annular-inward jet over a curved surface, surrounding an axisymmetric solid cone fuel spray. The stabilization characteristics and structure of n-heptane/air turbulent flames were investigated with varying fuel and air flow rates and the position of pressure atomizer (L). High-speed planar laser-induced fluorescence (PLIF) of OH radicals delineated reaction zone contours and simultaneously stereoscopic particle image velocimetry (SPIV) quantified the flow field features, involving turbulent mixing within spray, ambient air entrainment and flame-turbulence interaction. High turbulent rms velocities were generated within the recirculation zone, which improved the flame stabilization. OH fluorescence signals revealed a double flame structure near the stabilization edge of lifted flame that consisted of inner partially premixed flame and outer diffusion flame front. The inner reaction zone is highly wrinkled and folded due to significant turbulent mixing between the annular-air jet and the fuel vapor generated from droplets along the contact interface of this air jet with the fuel spray. Larger droplets, having higher momentum are able to penetrate the inner reaction zone and then vaporized in the low-speed hot region bounded by these reaction zones; this supports the outer diffusion flame. Frequent local extinctions in the inner reaction zone were observed at low air flow rate. As flow rate increases, the inner zone is more resistant to local extinction despite of its high wrinkling and corrugation degree. However, the outer reaction zone exhibits stable and mildly wrinkled features irrespective of air flow rate. The liftoff height increases with the air mass flow rate but decreases with L.
    Citation
    Stabilization and structure of N-heptane flame on CWJ-spray burner with kHZ SPIV and OH-PLIF 2015 Experimental Thermal and Fluid Science
    Publisher
    Elsevier BV
    Journal
    Experimental Thermal and Fluid Science
    DOI
    10.1016/j.expthermflusci.2015.08.019
    Additional Links
    http://linkinghub.elsevier.com/retrieve/pii/S0894177715002307
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.expthermflusci.2015.08.019
    Scopus Count
    Collections
    Articles; Clean Combustion Research Center

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