New Interfacial Fluid Thickness Approach in Aero-Optics with Applications to Compressible Turbulence.
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| Title: | New Interfacial Fluid Thickness Approach in Aero-Optics with Applications to Compressible Turbulence. |
|---|---|
| Authors: | Catrakis, Haris J.1 catrakis@uci.edu, Aguirre, Roberto C.1, Atassi, H. |
| Source: | AIAA Journal. Oct2004, Vol. 42 Issue 10, p1973-1981. 8p. 9 Diagrams. |
| Subjects: | Fluid dynamics, Aerodynamics, Aeronautics, Mechanical engineering, Mechanical movements, Optics, Interfaces (Physical sciences) |
| Abstract: | A general approach in aero-optics is proposed based on the physical thickness of refractive fluid interfaces. In turbulent flows between dissimilar-index-of-refraction or optically different gas streams, particularly at large Reynolds numbers, the interfacial fluid thickness is highly variable. The role of this interfacial fluid thickness in aero-optical interactions is examined by directly relating the optical path length (OPL) to the interfacial fluid thickness (IFT) variations. This is done by expressing the OPL as an integral of the IFT variations along the beam propagation path. The proposed IFT approach is demonstrated on refractive-field measurements in large Reynolds number (Re ∼ 106) high-compressibility (Mc ∼ 1) shear layers between optically different gases. Highly irregular networks of isolated high-gradient interfaces are observed at various transverse locations in the flow, that is, both in the interior and near the outer boundaries. The observation that the high-gradient interfaces are spatially isolated and the OPL interpretation in terms of the IFT variations are utilized to propose and demonstrate a new modeling approach for compressible flow where the high-gradient interfaces are the dominant elements needed to capture the large-scale optical distortions. The present approach suggests a new point of view for relating aero-optical distortions to the flow structure in terms of the IFT variations. [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.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 14795171 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: New Interfacial Fluid Thickness Approach in Aero-Optics with Applications to Compressible Turbulence. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Catrakis%2C+Haris+J%2E%22">Catrakis, Haris J.</searchLink><relatesTo>1</relatesTo><i> catrakis@uci.edu</i><br /><searchLink fieldCode="AR" term="%22Aguirre%2C+Roberto+C%2E%22">Aguirre, Roberto C.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Atassi%2C+H%2E%22">Atassi, H.</searchLink> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22AIAA+Journal%22">AIAA Journal</searchLink>. Oct2004, Vol. 42 Issue 10, p1973-1981. 8p. 9 Diagrams. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Fluid+dynamics%22">Fluid dynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Aerodynamics%22">Aerodynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Aeronautics%22">Aeronautics</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+engineering%22">Mechanical engineering</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+movements%22">Mechanical movements</searchLink><br /><searchLink fieldCode="DE" term="%22Optics%22">Optics</searchLink><br /><searchLink fieldCode="DE" term="%22Interfaces+%28Physical+sciences%29%22">Interfaces (Physical sciences)</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: A general approach in aero-optics is proposed based on the physical thickness of refractive fluid interfaces. In turbulent flows between dissimilar-index-of-refraction or optically different gas streams, particularly at large Reynolds numbers, the interfacial fluid thickness is highly variable. The role of this interfacial fluid thickness in aero-optical interactions is examined by directly relating the optical path length (OPL) to the interfacial fluid thickness (IFT) variations. This is done by expressing the OPL as an integral of the IFT variations along the beam propagation path. The proposed IFT approach is demonstrated on refractive-field measurements in large Reynolds number (Re ∼ 106) high-compressibility (Mc ∼ 1) shear layers between optically different gases. Highly irregular networks of isolated high-gradient interfaces are observed at various transverse locations in the flow, that is, both in the interior and near the outer boundaries. The observation that the high-gradient interfaces are spatially isolated and the OPL interpretation in terms of the IFT variations are utilized to propose and demonstrate a new modeling approach for compressible flow where the high-gradient interfaces are the dominant elements needed to capture the large-scale optical distortions. The present approach suggests a new point of view for relating aero-optical distortions to the flow structure in terms of the IFT variations. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab 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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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.2514/1.547 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 8 StartPage: 1973 Subjects: – SubjectFull: Fluid dynamics Type: general – SubjectFull: Aerodynamics Type: general – SubjectFull: Aeronautics Type: general – SubjectFull: Mechanical engineering Type: general – SubjectFull: Mechanical movements Type: general – SubjectFull: Optics Type: general – SubjectFull: Interfaces (Physical sciences) Type: general Titles: – TitleFull: New Interfacial Fluid Thickness Approach in Aero-Optics with Applications to Compressible Turbulence. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Catrakis, Haris J. – PersonEntity: Name: NameFull: Aguirre, Roberto C. – PersonEntity: Name: NameFull: Atassi, H. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 10 Text: Oct2004 Type: published Y: 2004 Identifiers: – Type: issn-print Value: 00011452 Numbering: – Type: volume Value: 42 – Type: issue Value: 10 Titles: – TitleFull: AIAA Journal Type: main |
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