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Unsteady Thin-Airfoil Theory Revisited: Application of a Simple Lift Formula.

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Title: Unsteady Thin-Airfoil Theory Revisited: Application of a Simple Lift Formula.
Authors: Tianshu Liu1 tianshu.liu@wmich.edu, Shizhao Wang2, Xing Zhang3, Guowei He4
Source: AIAA Journal. Jun2015, Vol. 53 Issue 6, p1492-1502. 11p.
Subjects: Aerofoils, Airplane design, Viscous flow, Fluid flow, Reynolds number, Computer simulation
Abstract: The physical foundations of unsteady thin-airfoil theory are explored in the general framework of viscous flows. The thin-airfoil lift formula is derived by using the simple lift formula that contains the vortex lift and the lift associated with the fluid acceleration. From a broader perspective, the thin-airfoil lift formula could be applicable even when the flow around an airfoil is moderately separated, from which the classical von Karman-Sears lift formula can be recovered as a reduced case. The quantitative relationship between boundary layer and lift generation is discussed. Direct numerical simulations of low-Reynolds-number flows over a flapping flat-plate airfoil are conducted to examine the accuracy and limitations of the thin-airfoil lift formula. [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
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Header DbId: egs
DbLabel: Engineering Source
An: 103017315
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Unsteady Thin-Airfoil Theory Revisited: Application of a Simple Lift Formula.
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  Data: <searchLink fieldCode="AR" term="%22Tianshu+Liu%22">Tianshu Liu</searchLink><relatesTo>1</relatesTo><i> tianshu.liu@wmich.edu</i><br /><searchLink fieldCode="AR" term="%22Shizhao+Wang%22">Shizhao Wang</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Xing+Zhang%22">Xing Zhang</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Guowei+He%22">Guowei He</searchLink><relatesTo>4</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22AIAA+Journal%22">AIAA Journal</searchLink>. Jun2015, Vol. 53 Issue 6, p1492-1502. 11p.
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  Data: <searchLink fieldCode="DE" term="%22Aerofoils%22">Aerofoils</searchLink><br /><searchLink fieldCode="DE" term="%22Airplane+design%22">Airplane design</searchLink><br /><searchLink fieldCode="DE" term="%22Viscous+flow%22">Viscous flow</searchLink><br /><searchLink fieldCode="DE" term="%22Fluid+flow%22">Fluid flow</searchLink><br /><searchLink fieldCode="DE" term="%22Reynolds+number%22">Reynolds number</searchLink><br /><searchLink fieldCode="DE" term="%22Computer+simulation%22">Computer simulation</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The physical foundations of unsteady thin-airfoil theory are explored in the general framework of viscous flows. The thin-airfoil lift formula is derived by using the simple lift formula that contains the vortex lift and the lift associated with the fluid acceleration. From a broader perspective, the thin-airfoil lift formula could be applicable even when the flow around an airfoil is moderately separated, from which the classical von Karman-Sears lift formula can be recovered as a reduced case. The quantitative relationship between boundary layer and lift generation is discussed. Direct numerical simulations of low-Reynolds-number flows over a flapping flat-plate airfoil are conducted to examine the accuracy and limitations of the thin-airfoil lift formula. [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:
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    Identifiers:
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        Value: 10.2514/1.J053439
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 11
        StartPage: 1492
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      – SubjectFull: Aerofoils
        Type: general
      – SubjectFull: Airplane design
        Type: general
      – SubjectFull: Viscous flow
        Type: general
      – SubjectFull: Fluid flow
        Type: general
      – SubjectFull: Reynolds number
        Type: general
      – SubjectFull: Computer simulation
        Type: general
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      – TitleFull: Unsteady Thin-Airfoil Theory Revisited: Application of a Simple Lift Formula.
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            NameFull: Shizhao Wang
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            NameFull: Xing Zhang
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              M: 06
              Text: Jun2015
              Type: published
              Y: 2015
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