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    Area of Science:

    • Combustion science
    • Laser-based diagnostics
    • Particle characterization

    Background:

    • Soot particle size is crucial for understanding combustion processes and heat transfer.
    • Current time-resolved laser-induced incandescence (TiRe-LII) methods for planar measurements are complex, requiring multiple cameras or laser pulses.
    • These limitations hinder application in unsteady or turbulent combustion environments.

    Purpose of the Study:

    • To develop and validate a simplified technique for planar soot particle sizing using TiRe-LII.
    • To enable measurements in challenging combustion conditions, including turbulent flames.
    • To advance the understanding of soot formation and its impact on combustion.

    Main Methods:

    • Utilized a single high-sensitivity, ultra-high-speed 10 MHz camera with a 50 ns gate and no intensifier.
    • Acquired background flame luminosity, prompt LII, and TiRe-LII decay signals within a single laser shot.
    • Validated the technique in a laminar non-premixed ethylene flame before application to a turbulent ethylene jet flame.

    Main Results:

    • Successfully demonstrated planar soot particle sizing using a single-shot, intensified-free TiRe-LII approach.
    • Obtained measurements of flame luminosity, prompt LII, and TiRe-LII decay signals.
    • Validated the technique's efficacy in both laminar and turbulent ethylene flames.

    Conclusions:

    • The developed single-camera, single-shot TiRe-LII technique offers a simplified and effective method for planar soot particle sizing.
    • This advancement facilitates measurements in complex and unsteady combustion environments, such as turbulent flames.
    • The technique provides valuable data for soot formation studies and combustion optimization.