Extraction of airfoil data using PIV and pressure measurements
Article first published online: 29 DEC 2010
Copyright © 2010 John Wiley & Sons, Ltd.
Volume 14, Issue 4, pages 539–556, May 2011
How to Cite
Yang, H., Shen, W. Z., Sørensen, J. N. and Zhu, W. J. (2011), Extraction of airfoil data using PIV and pressure measurements. Wind Energ., 14: 539–556. doi: 10.1002/we.441
- Issue published online: 17 MAY 2011
- Article first published online: 29 DEC 2010
- Manuscript Accepted: 18 OCT 2010
- Manuscript Revised: 17 OCT 2010
- Manuscript Received: 9 MAR 2010
- airfoil characteristics;
- wind turbine;
- rotor aerodynamics
A newly developed technique for determining the angle of attack (AOA) on a rotating blade is used to extract AOAs and airfoil data from measurements obtained during the MEXICO (Model rotor EXperiments in COntrolled conditions) rotor experiment. Detailed surface pressure and Particle Image Velocimetry (PIV) flow fields at different rotor azimuth positions are examined for determining sectional airfoil data. The AOA is derived locally by determining the local circulation on the blade from pressure data and subtracting the induction of the bound circulation from the local velocity. The derived airfoil data are compared to 2D data from wind tunnel experiments and XFOIL computations. The comparison suggests that the rotor is subject to severe 3D effects originating from the geometry of the rotor, and explains why the Blade Element Momentum technique with 2D airfoil data over-predicts the loading of the rotor. The extraction technique is verified by employing the derived airfoil characteristics as input to computations using the BEM technique and comparing the calculated axial and tangential forces to the measured data. The comparison also demonstrates that the used technique of determining the AOA is a reliable tool to extract airfoil data from experimental data. Copyright © 2010 John Wiley & Sons, Ltd.