Effects of finite aspect ratio on wind turbine airfoil measurements

The Science of Making Torque from Wind

Kiefer, Janik^1 ; Miller, Mark A.^1 ; Hultmark, Marcus^1 ; Hansen, Martin O. L.^2,3

Mechanical and Aerospace Engineering, Princeton University, Princeton

NJ, United States^1

DTU Wind Energy, Technical University of Denmark, Copenhagen, Denmark^2

Andlinger Center for Energy and the Environment, Princeton University, Princeton

NJ, United States^3

关键词: Airfoil datum;    Angles of attack;    Finite aspect ratio;    High angles of attack;    Lift and drag coefficients;    Low aspect ratio;    Operational cycle;    Wind turbine airfoils;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/753/2/022040/pdf
DOI  :  10.1088/1742-6596/753/2/022040

来源: IOP

【 摘 要 】

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.