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Dotted-line FLEET for two-component velocimetry.

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    This summary is machine-generated.

    This study introduces dotted-line Femtosecond Laser Electronic Excitation Tagging (FLEET) velocimetry. This novel technique enables simultaneous two-component velocity measurements across multiple points for enhanced flow analysis.

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    Area of Science:

    • Fluid Dynamics and Aerodynamics
    • Laser-Based Measurement Techniques
    • Turbulence Research

    Background:

    • Femtosecond Laser Electronic Excitation Tagging (FLEET) is an established unseeded velocimetry method.
    • Traditional FLEET measures single velocity components along a line or multiple components at a single point.
    • Existing methods lack the capability for dense spatial velocity profiling with multi-component measurements.

    Purpose of the Study:

    • To develop and demonstrate a novel dotted-line FLEET technique.
    • To combine the spatial resolution of line measurements with the multi-component capability of point measurements.
    • To enable two-component velocity measurements using a single camera setup.

    Main Methods:

    • A single beam path was utilized to generate multiple simultaneous laser spots.
    • A periodic mask with rectangular slits was employed to create the dotted pattern.
    • Measurements were conducted downstream of a turbulent, supersonic nitrogen free jet.

    Main Results:

    • Successfully implemented a dotted-line FLEET configuration generating up to seven simultaneous spots.
    • Achieved spot spacing of approximately 0.9 mm with diameters ranging from 150 to 350 µm.
    • Computed and presented both streamwise and radial velocity components.

    Conclusions:

    • The dotted-line FLEET technique effectively merges line-based dense profiling with point-based two-component velocimetry.
    • This advancement allows for more comprehensive velocity field characterization in complex flows.
    • The method offers a significant improvement over previous FLEET configurations for detailed flow analysis.