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H. Nakhla, D. White, W. Musial (2006)
Structural Dynamics of Small Wind Turbine Blade under Aerodynamic Loading
J. Leishman (1990)
Dynamic stall experiments on the NACA 23012 aerofoilExperiments in Fluids, 9
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Dynamic Stall Experiments on Oscillating AirfoilsAIAA Journal, 14
(2004)
Comparison of Optimized Aerodynamic Performance for Small Wind Turbine Rotors Designed with Theoretically Predicted versus Experimentally Measured Airfoil Characteristics. NREL, Colorado
P. Migliore, S. Oerlemans (2004)
Wind Tunnel Aeroacoustic Tests of Six Airfoils for Use on Small Wind Turbines
S. Newman (2007)
Principles of Helicopter Aerodynamics – Second edition J.G. Leishmann Cambridge University Press, The Edinburgh Building, Shaftesbury Road, Cambridge, CB2 2RU, UK. 2006. 826pp. Illustrated. £65. ISBN 0-521-85860-7.The Aeronautical Journal (1968), 111
M. Robinson, M. Hand, D. Simms, S. Schreck (1999)
Horizontal Axis Wind Turbine Aerodynamics: Three-Dimensional, Unsteady, and Separated Flow Influences
D. Somers, M. Maughmer (2003)
Theoretical Aerodynamic Analyses of Six Airfoils for Use on Small Wind Turbines: July 11, 2002--October 31, 2002
Sunetra Sarkar, K. Venkatraman (2008)
Influence of pitching angle of incidence on the dynamic stall behavior of a symmetric airfoilEuropean Journal of Mechanics B-fluids, 27
M. Selig, Bryan McGranahan (2004)
Wind tunnel aerodynamic tests of six airfoils for use on small wind turbinesJournal of Solar Energy Engineering-transactions of The Asme, 126
G. Srinivasan, J. Ekaterinaris, W. Mccroskey (1995)
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P. Migliore, J. Dam, A. Huskey (2003)
ACOUSTIC TESTS OF SMALL WIND TURBINES*§
M. Hansen (2008)
Aerodynamics of Wind Turbines: second edition
Unsteady aerodynamics and specifically the dynamic stall phenomenon significantly affect the aerodynamic performance of the wind turbine blades. This paper presents a 2D computational investigation on the aerodynamic characteristics of three specific airfoils for small horizontal axis wind turbines subjected to unsteady viscous flow. The unsteady incompressible Navier-Stokes equations are considered, and ANSYS-Fluent CFD code is used for the flow simulation. The simulation method is validated by calculating the aerodynamic coefficients of a pitching NACA23012 airfoil and comparing the results with the corresponding published experimental data. A complete set of dynamic simulations is then performed to find lift and drag forces acting on the airfoils in different unsteady conditions such as various Reynolds numbers and different amplitude and frequency of pitching oscillations. The results of this study emphasize that the curvature of leading edge and the thickness of the airfoil have major roles in early flow separation and dynamic stall of a pitching airfoil. The dynamic stall has wide negative effects on the performance of the blades such as lift reduction, drag increment and delay in the flow reattachment that are discussed in this paper.
Wind Engineering – SAGE
Published: Oct 1, 2014
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