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Aero-Optical Distortions of a Turbulent Boundary Layer at Back-Looking Viewing Angles.

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Title: Aero-Optical Distortions of a Turbulent Boundary Layer at Back-Looking Viewing Angles.
Authors: Gordeyev, Stanislav1 sgordeye@nd.edu, Butler, Luke2
Source: AIAA Journal. Jul2025, Vol. 63 Issue 7, p2635-2643. 9p.
Abstract: This paper presents the results of wavefront measurements of aero-optical effects due to a subsonic turbulent boundary layer at various laser beam viewing angles relative to the tunnel wall. Data were taken at Mach numbers of 0.3, 0.4, and 0.5 at back-looking angles ranging from 90 to 170 deg. A multipoint spectral cross-correlation technique was used to minimize the corrupting effects of the mechanical vibrations on the aero-optical spectra. A scaling of the aero-optical spectra as a function of the viewing angle was developed and discussed. Both the apparent optical convective speeds and the overall values of aero-optical distortions were extracted from data. Angular dependence of the aero-optical distortions was computed and found to agree with the isotropic model within a few percent. Two new models, accounting for the presence of the large-scale structures and for the spatial growth of the boundary layer, were proposed and discussed. [ABSTRACT FROM AUTHOR]
Copyright of AIAA Journal is the property of American Institute of Aeronautics & Astronautics and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Aero-Optical Distortions of a Turbulent Boundary Layer at Back-Looking Viewing Angles.
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  Data: <searchLink fieldCode="AR" term="%22Gordeyev%2C+Stanislav%22">Gordeyev, Stanislav</searchLink><relatesTo>1</relatesTo><i> sgordeye@nd.edu</i><br /><searchLink fieldCode="AR" term="%22Butler%2C+Luke%22">Butler, Luke</searchLink><relatesTo>2</relatesTo>
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  Data: This paper presents the results of wavefront measurements of aero-optical effects due to a subsonic turbulent boundary layer at various laser beam viewing angles relative to the tunnel wall. Data were taken at Mach numbers of 0.3, 0.4, and 0.5 at back-looking angles ranging from 90 to 170 deg. A multipoint spectral cross-correlation technique was used to minimize the corrupting effects of the mechanical vibrations on the aero-optical spectra. A scaling of the aero-optical spectra as a function of the viewing angle was developed and discussed. Both the apparent optical convective speeds and the overall values of aero-optical distortions were extracted from data. Angular dependence of the aero-optical distortions was computed and found to agree with the isotropic model within a few percent. Two new models, accounting for the presence of the large-scale structures and for the spatial growth of the boundary layer, were proposed and discussed. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of AIAA Journal is the property of American Institute of Aeronautics & Astronautics and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.2514/1.J064880
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              Text: Jul2025
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