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This paper is a continuation of an ongoing investigation of the optical distortions caused by a transonic attached turbulent boundary layer. To investigate the physical mechanisms of the optical aberrations, optical measurements with a high degree of temporal resolution using a Malley Probe were made along with unsteady surface pressure measurements and X-wire measurements at several different wall normal locations. It was found that wall pressure signals travel with the same convective speed as the optically aberrating structures, pointing toward pressure fluctuations in the outer part of the boundary layer as a primary cause for optical aberrations. Coherence lengths of flow structures are obtained and compared to the coherence lengths of optically aberrating structures. Aperture effects on optical distortion are presented and discussed. The model for optical aberrations in turbulent sheared mean flows is developed and discussed in detail.

Optical Aberrations Caused by Transonic Attached Boundary Layers: Underlying Flow Structure.