The Effect of Blade Geometry on Blade Stall Characteristics-Reference-Cited by-同舟云学术

The Effect of Blade Geometry on Blade Stall Characteristics

Published:2005-07-12 Issue:4 Volume:127 Page:496-502
ISSN:0199-6231
Container-title:Journal of Solar Energy Engineering
language:en
Short-container-title:

Author:

van Rooij R. P. J. O. M.¹,Schepers J. G.²

Affiliation:

1. Delft University of Technology, Faculty of Aerospace Engineering, Wind Energy Group, Kluyverweg 1, 2629 HS, Delft, The Netherlands

2. Energy Research Center of the Netherlands, ECN, P.O. Box 1, 1755 ZG, Petten, The Netherlands

Abstract

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 of c n between the different blade layouts. The formulation of the stall model was rewritten so that the measured c n values 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 term f used 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 twist + pitch is required in f . In addition, a dependency offon the angle-of-attack was identified in the measurements and it is recommended that this dependency be incorporated in the stall models.

Publisher

ASME International

Subject

Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment

Link

http://asmedigitalcollection.asme.org/solarenergyengineering/article-pdf/127/4/496/5727773/496_1.pdf

Reference12 articles.

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4. Schepers, J. G., and van Rooij, R. P. J. O. M., 2003, “Annexlyse, Inventory of analyses on IEA Annex XVIII Database,” Task 1 report, Report ECN, The Netherlands, http://www.ecn.nl/wind/other/annexlyse.html

5. Boundary Layer State and Flow Field Structure Underlying Rotational Augmentation of Blade Aerodynamic Response;Schreck;ASME J. Sol. Energy Eng.

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