Aero-Optic Characterization of Supersonic Boundary Layers in the Trisonic Gasdynamic Facility

Shack-Hartmann Wavefront Measurements of Supersonic Turbulent Boundary Layers in the TGF

“…In addition to wavefront measurements, the time-average sidewall turbulent boundary layer profiles were measured using a total pressure rake as part of this experiment. The estimation of boundary layer thickness from the rake measurements, including interpolation to the test conditions of the optical experiments, is presented in [10].…”

“…The aperture of the laser beam was 30 mm, giving the aperture-to-thickness ratio, Ap/δ, to be between 1.5 and 2.5, as the boundary layer thickness was different for different Mach and Reynolds numbers [10]. In [3,16] it was shown that for relatively small values of Ap/δ, spatial wavefront spectra are corrupted by aperture effects.…”

“…Two different wavefront sensors were used to collect time-resolved wavefront data, a Malley Probe and a high-speed Shack-Hartmann wavefront sensor. An analysis of the overall aberration levels and an assessment of the Malley Probe data are provided in a companion paper [10] while this paper will focus on the analysis of the Shack-Hartmann Sensor data, which provided 2-D, time-resolved wavefronts.…”

“…Extensive experimental measurements of the supersonic boundary layer on walls of the test section in Trisonic Gasdynamics Facility (TGF) were performed in August of 2013 for a range of subsonic and supersonic freestream speeds, Reynolds numbers and boundary layer thicknesses [10]. Two different wavefront sensors were used to collect time-resolved wavefront data, a Malley Probe and a high-speed Shack-Hartmann wavefront sensor.…”

Physics and Measurement of Aero-Optical Effects: Past and Present

“…In the second (present) period, not only has the instrumentation vastly improved, but the facilities are now more extensive. For example, aero-optical testing has now been performed at subsonic speeds at the Arnold Engineering and Development Center (AEDC; Hugo et al 1997, Fitzgerald & Jumper 2002 and in the SARL and TGF wind tunnels at the Wright-Patterson Air Force Base (Vukasinovic et al 2008(Vukasinovic et al , 2011Smith et al 2014a;Wittich et al 2014). Testing has also been performed at sub-, trans-, and supersonic speeds at the Air Force Academy (Gordeyev et al 2007a(Gordeyev et al ,b, 2012(Gordeyev et al , 2014b(Gordeyev et al , 2015bSiegel et al 2009;Nguyen et al 2015); at sub-, trans-, and supersonic speeds at the University of Notre Dame (Rennie et al 2008;Ponder et al 2010;Porter et al 2013b,c;Gordeyev et al 2014bGordeyev et al , 2015aHoupt et al 2016); and at hypersonic speeds at Purdue University (Gordeyev & Juliano 2016a,b).…”