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Optical Aberrations Caused by Coherent Structures in a Subsonic, Compressible, Turbulent Boundary Layer

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posted on 2010-07-18, 00:00 authored by Jacob Allen Cress
The relationship between optical aberrations and coherent structures in the turbulent boundary layer is investigated in a series of experiments. A statistical model is derived using the 'extended' Strong Reynolds Analogy that allows the total temperature to vary and also presumes pressure fluctuations in the boundary layer are negligible compared to temperature fluctuations. This model is compared to experimental results taken of a moderately heated and cooled boundary layer. The effect of elevation angle on the amount of optical aberration is also investigated and discussed in relation to coherent structures. Two-dimensional wavefronts through a single boundary layer are presented along with average correlation length results. The distribution in time of the optical aberrations is analyzed and considered in terms of communication applications. This work concludes with a discussion of coherent vortical structures and how they are related to optical aberrations, and the relative contribution of pressure and temperature fluctuations to wavefront distortions.

History

Date Modified

2017-06-05

Research Director(s)

Dr. Harindra Fernando

Committee Members

Dr. Scott Morris Dr. Meng Wang Dr. R. Mark Rennie

Degree

  • Doctor of Philosophy

Degree Level

  • Doctoral Dissertation

Language

  • English

Alternate Identifier

etd-07182010-172706

Publisher

University of Notre Dame

Program Name

  • Aerospace and Mechanical Engineering

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