Abstract
This paper presents the results of experimental investigation of aero-optical distortions caused by turbulent and laminar boundary layers in the Boeing/AFOSR Mach-6 Quiet Tunnel at Purdue University. Using optical window inserts installed in the test section, aerooptical distortions of the turbulent boundary layer at different freestream pressures were measured with a high-speed wavefront sensor at sampling speeds up to 1 MHz. Temporal and spatial statistics of the related aero-optical structure were measured and found to be quite similar to the ones at subsonic and low supersonic speeds. The existing model was found to under-predict the experimentally-measured levels of aero-optical distortions for turbulent boundary layers by 20%; possible reasons for this discrepancy are discussed. Intermittent turbulent spots and single-mode transitional events in the laminar boundary layers were observed and briefly analyzed.
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