The flame front of a premixed ethylene–air turbulent flame in a high-speed flowfield was imaged using hydroxyl radical (OH) planar laser-induced fluorescence (PLIF). An electrically heated continuous flow facility produced inflow conditions with a total temperature of 1200 K, corresponding to a flight Mach number of about five. A statistically stationary turbulent flame stabilized over a scaled-down cavity was used to generate experimental data for future comparisons with direct numerical simulations. A laser sheet with a wavelength of 283.55 nm was used to excite the Q 1 (8) transition of OH. The sheet waist had a full width at half-maximum of 95    μ m . Two-dimensional OH-PLIF images were collected at high in-plane spatial resolution (approximately 40 × 40    μ m ) with a field of view of 5.6 × 5.6    mm . The images spanned a region of 45 × 15    mm along the spanwise centerplane. The local OH gradient was used to isolate the flame front in all images through an automated process. Each image was processed to obtain the appropriate statistics, time-averaged flame surface density, and flame front curvature values. The distribution of local flame front curvature values was approximately constant across the domain.


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    Title :

    Flame Structure Characterization in a Dual-Mode Scramjet Using Hydroxyl Planar Laser-Induced Fluorescence



    Published in:

    AIAA Journal ; 59 , 5 ; 1824-1835


    Publication date :

    2021-05-01




    Type of media :

    Conference paper , Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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