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You searched for +publisher:"University of Notre Dame" +contributor:("Eric Jumper, Committee Co-Chair"). Showing records 1 – 3 of 3 total matches.

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University of Notre Dame

1. Adam Edwin Smith. Evaluation of Passive Boundary Layer Flow Control Techniques for Aero-Optic Mitigation</h1>.

Degree: PhD, Aerospace and Mechanical Engineering, 2015, University of Notre Dame

The effect of two passive boundary layer flow control techniques, Large-Eddy Break-Up (LEBU) devices and wall heating/cooling, on turbulent boundary layer induced aero-optical aberrations is experimentally investigated. A series of experiments is performed investigating the effect of LEBUs on levels of optical aberrations in the turbulent boundary layer. The results of these experiments are analyzed to determine the physical mechanisms responsible for the experimentally observed changes, and to characterize the sensitivity of optical distortions to different LEBU device configurations. The effect of moderate levels of boundary layer wall cooling, both for full and partial wall cooling, on aero-optic aberrations is also experimentally investigated, and the results are compared to a statistical model derived using the temperature-velocity relation from the Extended Strong Reynolds Analogy and a simple model for the development of thermal sub-layers in partially cooled boundary layers. A method is proposed to use wall heating to passively amplify aero-optic aberrations to measure wavefront distortions in boundary layers with normally weak aero-optical effects. The method is used to study turbulent boundary layers with low Reynolds numbers. This work concludes with a brief summary of important findings, and a discussion of the implementation of these flow control techniques for real laser transmitting systems. Advisors/Committee Members: Thomas Corke, Committee Member, Stanislav Gordeyev, Committee Co-Chair, Eric Jumper, Committee Co-Chair, Meng Wang, Committee Member, Gretar Tryggvason, Committee Member.

Subjects/Keywords: LEBU; turbulent boundary layer; flow control; Aero-optics

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APA (6th Edition):

Smith, A. E. (2015). Evaluation of Passive Boundary Layer Flow Control Techniques for Aero-Optic Mitigation</h1>. (Doctoral Dissertation). University of Notre Dame. Retrieved from https://curate.nd.edu/show/q237hq4074k

Chicago Manual of Style (16th Edition):

Smith, Adam Edwin. “Evaluation of Passive Boundary Layer Flow Control Techniques for Aero-Optic Mitigation</h1>.” 2015. Doctoral Dissertation, University of Notre Dame. Accessed October 15, 2019. https://curate.nd.edu/show/q237hq4074k.

MLA Handbook (7th Edition):

Smith, Adam Edwin. “Evaluation of Passive Boundary Layer Flow Control Techniques for Aero-Optic Mitigation</h1>.” 2015. Web. 15 Oct 2019.

Vancouver:

Smith AE. Evaluation of Passive Boundary Layer Flow Control Techniques for Aero-Optic Mitigation</h1>. [Internet] [Doctoral dissertation]. University of Notre Dame; 2015. [cited 2019 Oct 15]. Available from: https://curate.nd.edu/show/q237hq4074k.

Council of Science Editors:

Smith AE. Evaluation of Passive Boundary Layer Flow Control Techniques for Aero-Optic Mitigation</h1>. [Doctoral Dissertation]. University of Notre Dame; 2015. Available from: https://curate.nd.edu/show/q237hq4074k


University of Notre Dame

2. Jacob Allen Cress. Optical Aberrations Caused by Coherent Structures in a Subsonic, Compressible, Turbulent Boundary Layer</h1>.

Degree: PhD, Aerospace and Mechanical Engineering, 2010, University of Notre Dame

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. Advisors/Committee Members: Dr. Stanislav Gordeyev, Committee Co-Chair, Dr. Scott Morris, Committee Member, Dr. Eric Jumper, Committee Co-Chair, Dr. Harindra Fernando, Committee Chair, Dr. Meng Wang, Committee Member, Dr. R. Mark Rennie, Committee Member.

Subjects/Keywords: communication; boundary layer; aero-optics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Cress, J. A. (2010). Optical Aberrations Caused by Coherent Structures in a Subsonic, Compressible, Turbulent Boundary Layer</h1>. (Doctoral Dissertation). University of Notre Dame. Retrieved from https://curate.nd.edu/show/tb09j388g29

Chicago Manual of Style (16th Edition):

Cress, Jacob Allen. “Optical Aberrations Caused by Coherent Structures in a Subsonic, Compressible, Turbulent Boundary Layer</h1>.” 2010. Doctoral Dissertation, University of Notre Dame. Accessed October 15, 2019. https://curate.nd.edu/show/tb09j388g29.

MLA Handbook (7th Edition):

Cress, Jacob Allen. “Optical Aberrations Caused by Coherent Structures in a Subsonic, Compressible, Turbulent Boundary Layer</h1>.” 2010. Web. 15 Oct 2019.

Vancouver:

Cress JA. Optical Aberrations Caused by Coherent Structures in a Subsonic, Compressible, Turbulent Boundary Layer</h1>. [Internet] [Doctoral dissertation]. University of Notre Dame; 2010. [cited 2019 Oct 15]. Available from: https://curate.nd.edu/show/tb09j388g29.

Council of Science Editors:

Cress JA. Optical Aberrations Caused by Coherent Structures in a Subsonic, Compressible, Turbulent Boundary Layer</h1>. [Doctoral Dissertation]. University of Notre Dame; 2010. Available from: https://curate.nd.edu/show/tb09j388g29


University of Notre Dame

3. Aaron Wesley Buckner. Optical Aberrations in a Subsonic, Compressible, Turbulent Boundary Layer</h1>.

Degree: MSAeroE, Aerospace and Mechanical Engineering, 2005, University of Notre Dame

An experimental investigation of the physical cause of optical aberrations in a compressible, subsonic, turbulent boundary layer was conducted. X-wire, surface pressure, and optical data were collected to document the coherence lengths of coherent flow structures in all three coordinate directions in a turbulent boundary layer. These coherence lengths were measured to be on the order of the boundary layer displacement thickness, and together with the high convective speed of the coherent structures indicated that optically aberrating structures were located in the outer portion of the boundary layer. Conditionally averaging the velocity and surface pressure data based on minima in the OPD yielded a large-scale, coherent, vortical flow structure. This result provides a direct link between optical aberrations and large-scale, coherent, vortical structures (and their concomitant pressure wells) in the outer portion of a turbulent boundary layer. Advisors/Committee Members: Scott Morris, Committee Member, Flint O. Thomas, Committee Member, Eric Jumper, Committee Co-Chair, Stanislav Gordeyev, Committee Co-Chair.

Subjects/Keywords: aero-optics; turbulent boundary layer

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Buckner, A. W. (2005). Optical Aberrations in a Subsonic, Compressible, Turbulent Boundary Layer</h1>. (Masters Thesis). University of Notre Dame. Retrieved from https://curate.nd.edu/show/37720c5002r

Chicago Manual of Style (16th Edition):

Buckner, Aaron Wesley. “Optical Aberrations in a Subsonic, Compressible, Turbulent Boundary Layer</h1>.” 2005. Masters Thesis, University of Notre Dame. Accessed October 15, 2019. https://curate.nd.edu/show/37720c5002r.

MLA Handbook (7th Edition):

Buckner, Aaron Wesley. “Optical Aberrations in a Subsonic, Compressible, Turbulent Boundary Layer</h1>.” 2005. Web. 15 Oct 2019.

Vancouver:

Buckner AW. Optical Aberrations in a Subsonic, Compressible, Turbulent Boundary Layer</h1>. [Internet] [Masters thesis]. University of Notre Dame; 2005. [cited 2019 Oct 15]. Available from: https://curate.nd.edu/show/37720c5002r.

Council of Science Editors:

Buckner AW. Optical Aberrations in a Subsonic, Compressible, Turbulent Boundary Layer</h1>. [Masters Thesis]. University of Notre Dame; 2005. Available from: https://curate.nd.edu/show/37720c5002r

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