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Related Experiment Video

Updated: Jul 3, 2025

Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow
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Tomographic FLEET with a wedge array for multi-point three-component velocimetry.

Daniel Richardson, Yibin Zhang, Steven J Beresh

    Optics Letters
    |February 15, 2024
    PubMed
    Summary
    This summary is machine-generated.

    Femtosecond laser electronic excitation tagging (FLEET) velocimetry now measures three-component flow velocity at multiple points. This advanced technique uses tomographic imaging for enhanced spatial coverage in supersonic and hypersonic flows.

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    Last Updated: Jul 3, 2025

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    Area of Science:

    • Fluid dynamics
    • Optical diagnostics
    • Aerodynamics

    Background:

    • Femtosecond laser electronic excitation tagging (FLEET) velocimetry is crucial for seedless flow measurements, especially in supersonic and hypersonic regimes.
    • Current methods typically offer one-dimensional, single-component velocity data using a single laser line and camera.
    • While multi-spot and multi-component systems exist, they often lack comprehensive spatial coverage.

    Purpose of the Study:

    • To enhance FLEET velocimetry by enabling three-component velocity measurements at multiple points.
    • To improve the spatial resolution and coverage of FLEET measurements.
    • To demonstrate a novel tomographic imaging approach for advanced flow diagnostics.

    Main Methods:

    • Utilized tomographic imaging to reconstruct the 3D positions of multiple FLEET-generated plasma spots.
    • Employed a quadscope to combine four distinct camera views onto a single high-speed camera.
    • Introduced glass wedges to generate nine closely spaced FLEET spots with minimal signal loss (<10%).

    Main Results:

    • Successfully achieved tomographic reconstruction of multiple FLEET spots for 3D velocity analysis.
    • Demonstrated the capability for multiple-point, three-component velocimetry.
    • Validated the technique in an underexpanded jet flow.

    Conclusions:

    • The developed tomographic FLEET system significantly improves measurement dimensionality and spatial coverage.
    • This advancement offers a more comprehensive understanding of complex flow fields.
    • The technique shows promise for detailed analysis in challenging aerodynamic environments.