Journal
AIAA JOURNAL
Volume 57, Issue 11, Pages 4725-4737Publisher
AMER INST AERONAUTICS ASTRONAUTICS
DOI: 10.2514/1.J057759
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Funding
- Arnold Engineering Development Center (AEDC/TTSY) SBIR Phase II Contract [FA9101-16-C-0023]
- Office of the Secretary of Defense (OSD) Test Resource Management Center (TRMC) Test and Evaluation/Science and Technology (T&E/S&T) High Speed Systems Test (HSST) program
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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 N2 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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