The effect of rotation has been investigated with emphasis on the impact of blade geometry on the “correction factor” in stall models. The data used came from field tests and wind tunnel experiments performed by the National Renewable Energy Laboratory and were restricted to the steady-state nonyawed conditions. Three blade layouts were available; a blade with constant chord without twist (phase II), a blade with constant chord and twist (phases III and IV), and a tapered blade with twist (phase VI). Effects due to twist and taper were determined from comparison ofbetween the different blade layouts. The formulation of the stall model was rewritten so that the measuredvalues could be used without reference to 2D airfoil performance. This enabled a direct comparison of the normal force characteristics between the four blade stations of the selected blade configurations. In particular, the correction termused in stall models for rotational effects was analyzed. The comparison between the test results with a straight and a twisted blade showed that a relation for twistpitch is required in. In addition, a dependency ofon the angle-of-attack was identified in the measurements and it is recommended that this dependency be incorporated in the stall models.
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e-mail: r.vanrooij@lr.tudelft.nl
e-mail: schepers@ecn.nl
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November 2005
Research Papers
The Effect of Blade Geometry on Blade Stall Characteristics
R. P. J. O. M. van Rooij,
e-mail: r.vanrooij@lr.tudelft.nl
R. P. J. O. M. van Rooij
Delft University of Technology
, Faculty of Aerospace Engineering, Wind Energy Group, Kluyverweg 1, 2629 HS, Delft, The Netherlands
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J. G. Schepers
e-mail: schepers@ecn.nl
J. G. Schepers
Energy Research Center of the Netherlands
, ECN, P.O. Box 1, 1755 ZG, Petten, The Netherlands
Search for other works by this author on:
R. P. J. O. M. van Rooij
Delft University of Technology
, Faculty of Aerospace Engineering, Wind Energy Group, Kluyverweg 1, 2629 HS, Delft, The Netherlandse-mail: r.vanrooij@lr.tudelft.nl
J. G. Schepers
Energy Research Center of the Netherlands
, ECN, P.O. Box 1, 1755 ZG, Petten, The Netherlandse-mail: schepers@ecn.nl
J. Sol. Energy Eng. Nov 2005, 127(4): 496-502 (7 pages)
Published Online: July 12, 2005
Article history
Received:
February 4, 2005
Revised:
July 11, 2005
Accepted:
July 12, 2005
Citation
van Rooij, R. P. J. O. M., and Schepers, J. G. (July 12, 2005). "The Effect of Blade Geometry on Blade Stall Characteristics." ASME. J. Sol. Energy Eng. November 2005; 127(4): 496–502. https://doi.org/10.1115/1.2037090
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