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Multi-point FLEET velocimetry in a Mach 4 Ludwieg tube using a diffractive optical element.

Farhan Siddiqui, Mark Gragston

    Applied Optics
    |March 4, 2024
    PubMed
    Summary

    This study introduces a new method using diffractive optics with femtosecond laser electronic excitation tagging (FLEET) velocimetry for high-speed wind tunnel measurements. The novel parallel viewing configuration enables wall-normal flow diagnostics without laser impingement.

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    Area of Science:

    • Fluid Dynamics and Aerodynamics
    • Optical Measurement Techniques
    • Laser-Based Diagnostics

    Background:

    • High-speed wind tunnels are crucial for aerospace research.
    • Accurate flow velocity measurements are essential for understanding aerodynamic phenomena.
    • Traditional velocimetry methods can have limitations in complex flow environments.

    Purpose of the Study:

    • To develop and evaluate novel configurations for femtosecond laser electronic excitation tagging (FLEET) velocimetry.
    • To investigate the use of diffractive optical elements for enhanced FLEET measurements.
    • To demonstrate the utility of these techniques in a Mach 4 Ludwieg tube.

    Main Methods:

    • Integration of a diffractive optical element with FLEET velocimetry.
    • Exploration of two viewing configurations: orthogonal and parallel to the laser beam axis.
    • Demonstration in a Mach 4 Ludwieg tube for high-speed flow characterization.

    Main Results:

    • The parallel viewing configuration allows for wall-normal FLEET measurements.
    • This configuration avoids direct laser impingement on the surface.
    • Successful probing of multiple locations in a high-speed flow environment.

    Conclusions:

    • The combined use of diffractive optics and FLEET velocimetry offers a versatile tool for high-speed flow diagnostics.
    • The parallel viewing approach provides a significant advantage for wall-bounded flow measurements.
    • This technique enhances the capability for detailed aerodynamic analysis in wind tunnel testing.