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Related Experiment Video

Updated: Jul 29, 2025

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Tri-zone flame spatial structure imaging combined with endogenic polarized scattering.

Liyuan Huang, Biwang Liu, Zhekai Lin

    Optics Letters
    |May 23, 2023
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    This study introduces a novel multi-mode optical imaging technique to map flame structures, identifying preheating, reaction, and recombination zones using infrared, visible, and polarization cameras for combustion analysis.

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    Area of Science:

    • Combustion science
    • Optical diagnostics
    • Multiphase flow

    Background:

    • Understanding flame structure is crucial for optimizing combustion processes and reducing emissions.
    • Current methods often lack the resolution or multi-modal capabilities to fully characterize different flame zones.

    Purpose of the Study:

    • To develop and validate a multi-mode optical imaging method for reconstructing 2D and 3D spatial structures of flame zones.
    • To differentiate and characterize preheating, reaction, and recombination zones within an axisymmetric steady flame.

    Main Methods:

    • Synchronous capture of images using infrared, visible light monochromatic, and polarization cameras.
    • 3D image reconstruction by combining images from different projection positions.
    • Calculation of the Degree of Linear Polarization (DOLP) from polarization camera data.

    Main Results:

    • Infrared and visible light images correspond to the preheating and reaction zones, respectively.
    • DOLP images highlight the flame recombination zone, distinct from reaction and preheating zones.
    • Recombination zone structures vary with different fuels, indicating fuel-specific combustion product particle behavior.

    Conclusions:

    • The multi-mode optical imaging method effectively distinguishes and maps preheating, reaction, and recombination zones.
    • Endogenic polarized scattering by combustion product particles is identified as the mechanism for the recombination zone signal.
    • This technique provides insights into combustion mechanisms, product formation, and quantitative flame composition.