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In-Flight Studies of Aero-Optical Distortions Around AAOL-BC

The work described here seeks to characterize the aero-optical environment around the Airborne Aero-Optics Laboratory for Beam Control (AAOL-BC) at subsonic and transonic speeds. Wavefront measurements were taken at varying Mach numbers through both the naturally developing boundary layer on the aircraft surface and an artificially generated shear layer. Wavefront aberrations were quantified and delineated based on the convective speeds of aero-optical distortions. Upstream propagating sound waves, originating from the aircraft’s engine, induced optical distortions identified in all collected wavefront data. The dominant frequency associated with these acoustical aberrations closely coincides with the engine’s fan blade passing frequency. Speeds of the acoustical distortions were directly measured and found to agree with theoretical predictions. Levels of aero-optical distortions due to the downstream convecting boundary layer and shear layer were both found to increase with Mach number, consistent with existing scaling laws. Convective speeds and other properties associated with these fundamental flow-fields were also measured.