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    Area of Science:

    • Fluid dynamics
    • Laser-based diagnostics
    • Combustion science

    Background:

    • High-speed flow velocimetry is crucial for understanding complex phenomena.
    • Existing techniques often face limitations in temporal or spatial resolution.
    • Femtosecond laser electronic excitation tagging (FLEET) offers a promising alternative for advanced flow diagnostics.

    Purpose of the Study:

    • To demonstrate the capability of FLEET for high-frequency (100 kHz) velocimetry.
    • To investigate FLEET signal and lifetime characteristics in reacting and non-reacting flows.
    • To validate FLEET for quantitative velocity measurements in challenging environments like supersonic jets and detonations.

    Main Methods:

    • Utilized femtosecond laser electronic excitation tagging (FLEET) for flow imaging.
    • Performed single-shot, quantitative velocity profile measurements at 100 kHz.
    • Investigated FLEET emission properties in methane flames and cold gas mixtures.
    • Applied FLEET to measure detonation wave velocities.

    Main Results:

    • Achieved 100 kHz imaging rate for quantitative velocity profiles of a supersonic nitrogen jet.
    • Observed significantly shorter emission lifetimes in post-flame regions compared to ambient air.
    • Identified a doubled emission lifetime above equivalence ratio 1.1 in methane flames.
    • Measured detonation wave velocities up to 1800 m/s using FLEET.

    Conclusions:

    • FLEET is a viable technique for high-speed, quantitative velocimetry.
    • FLEET performance is influenced by flow conditions, including temperature and composition.
    • The method is extendable to large-scale and complex reacting flow environments.