Effects of finite aspect ratio on wind turbine airfoil measurements

Janik Kiefer, Mark A. Miller, Marcus Hultmark, Martin Otto Laver Hansen

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    Wind turbines partly operate in stalled conditions within their operational cycle. To simulate these conditions, it is also necessary to obtain 2-D airfoil data in terms of lift and drag coefficients at high angles of attack. Such data has been obtained previously, but often at low aspect ratios and only barely past the stall point, where strong wall boundary layer influence is expected. In this study, the influence of the wall boundary layer on 2D airfoil data, especially in the post stall domain, is investigated. Here, a wind turbine airfoil is tested at different angles of attack and with two aspect ratios of AR = 1 and AR = 2. The tests are conducted in a wind tunnel that is pressurized up to 150 bar in order to achieve a constant Reynolds number of Rec = 3 ∙ 106, despite the variable chord length.
    Original languageEnglish
    Article number022040
    Book seriesJournal of Physics: Conference Series (Online)
    Number of pages6
    Publication statusPublished - 2016
    EventThe Science of Making Torque from Wind 2016 - Technische Universität München (TUM), Munich, Germany
    Duration: 5 Oct 20167 Oct 2016
    Conference number: 6


    ConferenceThe Science of Making Torque from Wind 2016
    LocationTechnische Universität München (TUM)
    Internet address


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