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Aerodynamic Characteristics of Airfoils Equipped With Gurney Flaps and Vortex Generators for the Entire Range of Pitch Angles.

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Title: Aerodynamic Characteristics of Airfoils Equipped With Gurney Flaps and Vortex Generators for the Entire Range of Pitch Angles.
Authors: Ivanković, Marin1,2 (AUTHOR) marin.ivankovic@fsb.unizg.hr, Jentzsch, Marvin2 (AUTHOR), Manolesos, Marinos3 (AUTHOR), Nayeri, Christian Navid2 (AUTHOR), Kozmar, Hrvoje1 (AUTHOR)
Source: Wind Energy. May2026, Vol. 29 Issue 5, p1-28. 28p.
Subjects: Vortex generators, Flaps (Airplanes), Flow separation, Lift (Aerodynamics), Angle of attack (Aerodynamics), Aerofoils, Vertical axis wind turbines, Aerodynamics
Abstract: An experimental study of NACA0021 airfoil equipped with vortex generators (VGs) and Gurney flaps (GFs) was conducted to assess the effects of these devices on the aerodynamic airfoil performance, the information that is necessary for studying the self‐starting characteristics of vertical axis wind turbines (VAWTs). This is particularly important given current efforts to enhance the efficiency and lifetime of VAWTs. The pressure distribution on the airfoil was assessed for the entire angle of attack (AoA) range (i.e., 0° ≤ AoA < 360°). Four airfoil configurations were studied, i.e., (a) the baseline airfoil, (b) the airfoil with VGs, (c) the airfoil with a GF with a height of 0.014 chord (c) lengths, and (d) the airfoil with a GF of height 0.025c. VGs yield a 33.3% increase in the AoA at which the flow reattaches and 16.3% increase in the maximum lift force coefficient cL. Configurations equipped with GFs exhibit 27.9% increase in the maximum cL and a concurrent increase in the lift‐to‐drag ratio. [ABSTRACT FROM AUTHOR]
Copyright of Wind Energy is the property of Wiley-Blackwell 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: Aerodynamic Characteristics of Airfoils Equipped With Gurney Flaps and Vortex Generators for the Entire Range of Pitch Angles.
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  Data: &lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Ivanković%2C+Marin%22&quot;&gt;Ivanković, Marin&lt;/searchLink&gt;&lt;relatesTo&gt;1,2&lt;/relatesTo&gt; (AUTHOR)&lt;i&gt; marin.ivankovic@fsb.unizg.hr&lt;/i&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Jentzsch%2C+Marvin%22&quot;&gt;Jentzsch, Marvin&lt;/searchLink&gt;&lt;relatesTo&gt;2&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Manolesos%2C+Marinos%22&quot;&gt;Manolesos, Marinos&lt;/searchLink&gt;&lt;relatesTo&gt;3&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Nayeri%2C+Christian&#160;Navid%22&quot;&gt;Nayeri, Christian&#160;Navid&lt;/searchLink&gt;&lt;relatesTo&gt;2&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Kozmar%2C+Hrvoje%22&quot;&gt;Kozmar, Hrvoje&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)
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  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22Wind+Energy%22&quot;&gt;Wind Energy&lt;/searchLink&gt;. May2026, Vol. 29 Issue 5, p1-28. 28p.
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– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: An experimental study of NACA0021 airfoil equipped with vortex generators (VGs) and Gurney flaps (GFs) was conducted to assess the effects of these devices on the aerodynamic airfoil performance, the information that is necessary for studying the self‐starting characteristics of vertical axis wind turbines (VAWTs). This is particularly important given current efforts to enhance the efficiency and lifetime of VAWTs. The pressure distribution on the airfoil was assessed for the entire angle of attack (AoA) range (i.e., 0&#176; ≤ AoA &lt; 360&#176;). Four airfoil configurations were studied, i.e., (a) the baseline airfoil, (b) the airfoil with VGs, (c) the airfoil with a GF with a height of 0.014 chord (c) lengths, and (d) the airfoil with a GF of height 0.025c. VGs yield a 33.3% increase in the AoA at which the flow reattaches and 16.3% increase in the maximum lift force coefficient cL. Configurations equipped with GFs exhibit 27.9% increase in the maximum cL and a concurrent increase in the lift‐to‐drag ratio. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: &lt;i&gt;Copyright of Wind Energy is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder&#39;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.&lt;/i&gt; (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1002/we.70106
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 28
        StartPage: 1
    Subjects:
      – SubjectFull: Vortex generators
        Type: general
      – SubjectFull: Flaps (Airplanes)
        Type: general
      – SubjectFull: Flow separation
        Type: general
      – SubjectFull: Lift (Aerodynamics)
        Type: general
      – SubjectFull: Angle of attack (Aerodynamics)
        Type: general
      – SubjectFull: Aerofoils
        Type: general
      – SubjectFull: Vertical axis wind turbines
        Type: general
      – SubjectFull: Aerodynamics
        Type: general
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      – TitleFull: Aerodynamic Characteristics of Airfoils Equipped With Gurney Flaps and Vortex Generators for the Entire Range of Pitch Angles.
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            NameFull: Ivanković, Marin
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            NameFull: Jentzsch, Marvin
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            NameFull: Manolesos, Marinos
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            NameFull: Nayeri, Christian Navid
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            – D: 01
              M: 05
              Text: May2026
              Type: published
              Y: 2026
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