Femtosecond laser electronic excitation tagging (FLEET) is a nonintrusive optical diagnostic technique that has been demonstrated to provide direct measurement of velocity and other transport properties in unseeded air and nitrogen flows. A portable FLEET system that uses a single laser for production of N 2 tracers and a single camera for tracking their motion in real time has been developed and deployed. The system performance for high-speed velocimetry in unseeded nitrogen flow has been evaluated at the AEDC Hypervelocity Wind Tunnel 9. Instantaneous velocity measurements at 1 kHz repetition rate were performed during 21 tunnel runs at Mach 10 and 14, both in freestream and in a turbulent boundary layer. The freestream velocities measured with FLEET displayed excellent agreement with the velocities computed using the standard Tunnel 9 data reduction methodology. The turbulent boundary-layer velocity profiles measured with FLEET also showed good agreement with PIV measurements and boundary-layer computational modeling.


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    Title :

    Femtosecond Laser Electronic Excitation Tagging Velocimetry in a Large-Scale Hypersonic Facility


    Contributors:

    Published in:

    AIAA Journal ; 57 , 11 ; 4725-4737


    Publication date :

    2019-07-16


    Size :

    13 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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