High-Speed Schlieren and 10-Hz Kr PLIF for the new AFRL Mach-6 Ludwieg Tube Hypersonic Wind Tunnel
Technical Report,26 Feb 2015,01 Jul 2017
Hypersonic Sciences Branch WRIGHT-PATTERSON AIR FORCE BASE United States
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Flow visualization measurement techniques, namely high-speed schlieren and two-photon Kr planar laser-induced fluorescence PLIF at 10-Hz repetition rate, were developed and implemented in a new AFRL Mach-6 Ludwieg Tube Hypersonic Wind Tunnel. Because of its high frame rates, the schlieren technique was first employed to image the starting shock and the entire startup process. These schlieren images also helped interpret the pressure measurements during the startup process and characterize the tunnel noise for boundary-layer transition experiments. Next, both schlieren and Kr PLIF were employed to image the bow shock from a large blunt cone at Po 1.38 MPa, and the measured bow shock shapes from both techniques were compared to CFD calculations employing the US3D simulation code.
- Test Facilities, Equipment and Methods