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

Doctoral Dissertation

Abstract

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.

Attributes

Attribute NameValues
URN
  • etd-07182010-172706

Author Jacob Allen Cress
Advisor Dr. Harindra Fernando
Contributor Dr. Stanislav Gordeyev, Committee Co-Chair
Contributor Dr. Scott Morris, Committee Member
Contributor Dr. Eric Jumper, Committee Co-Chair
Contributor Dr. Harindra Fernando, Committee Chair
Contributor Dr. Meng Wang, Committee Member
Contributor Dr. R. Mark Rennie, Committee Member
Degree Level Doctoral Dissertation
Degree Discipline Aerospace and Mechanical Engineering
Degree Name PhD
Defense Date
  • 2010-07-13

Submission Date 2010-07-18
Country
  • United States of America

Subject
  • communication

  • boundary layer

  • aero-optics

Publisher
  • University of Notre Dame

Language
  • English

Record Visibility Public
Content License
  • All rights reserved

Departments and Units

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