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TECHNICAL PAPERS

Drag Prediction for Blades at High Angle of Attack Using CFD

[+] Author and Article Information
N. N. Sørensen

Wind Energy Department, Risø National Laboratory, DK-4000 Roskilde, Denmark

J. A. Michelsen

Wind Energy Department, Risø National Laboratory, DK-4000 Roskilde, Denmark;Department of Mechanical Engineering, Technical University of Denmark, DK-2800 Lyngby, Denmark

J. Sol. Energy Eng 126(4), 1011-1016 (Nov 18, 2004) (6 pages) doi:10.1115/1.1807854 History: Received March 03, 2004; Revised May 24, 2004; Online November 18, 2004
Copyright © 2004 by ASME
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References

Ostawari,  C., and Naik,  D., 1984, “Post Stall Studies of Untwisted Varying Aspect Ratio Blades with an NACA 4415 Airfoil Section—Part I,” Wind Eng., 8(3), pp. 176–194.
Ostawari,  C., and Naik,  D., 1984, “Post Stall Studies of Untwisted Varying Aspect Ratio Blades with an NACA 44XX Series Airfoil Section—Part II,” Wind Eng., 9(3), pp. 149–164.
Dahlberg, J.-A., and Ronsten, G., 1994, “A Wind Tunnel Investigation of Tower Blockage Effects and Parking Loads on a E 5.35 M Horizontal Axis Wind Turbine,” In 5th European Wind Energy Association Conference and Exhibition, Copenhagen, Denmark, volume II, pp. 414–417, 10–14 October.
Simms, D., Hand, M. M., Fingersh, L. J., and Jager, D. W., 1999, “Unsteady Aerodynamics Experiment Phases II–IV: Test Configurations and Available Data Campaigns” NREL/TP-500-25950, Nat. Ren. Energy Lab., Golden, CO.
Dekker, J. W. M., de Groot, C. M., and Spath, M., 1989, “Mechanical Measurements on VSH 20-WPX-THR Rotor Blades at the ‘25 HAWT’ Rotor Test Facility—Part 1,” Ecn-89-35, The Netherlands Energy Research Foundation (ECN).
Paulsen, U. S., 1989, “Aerodynamics of Full Scale, Non-rotating Wind Turbine Blade Under Natural Wind Conditions,” Risø-M-2768, Risø National Laboratory, Roskilde, Denmark.
Brand, A. J., and Montgomerie, B., 1995, “Quasi-Steady Aerodynamic Coefficients at a Large Range of Angles of Attack,” Ecn-c-95-059, The Netherlands Energy Research Foundation (ECN).
Montgomerie, B., 1996. Drag Coefficient Distribution on a Wing at 90 Degrees to the Wind. Ecn-c-95-061, The Netherlands Energy Research Foundation (ECN).
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Bertagnolio, F., Sørensen, N. N., Johansen, J., and Fuglsang, P., 2001, “Wind Turbine Airfoil Catalogue,” Risø-R-1280-(EN), Risø National Laboratory, Roskilde, Denmark.
Johansen, J., Sørensen, N. N., Michelsen, J. A., and Schreck, S., 2001, “Detached-Eddy Simulation of Flow Around the S809 Airfoil,” in European Wind Energy Conference & Exhibition, Copenhagen, Denmark, pp. 414–417, 2–6.
Michelsen, J. A., 1992, “Basis3D—A Platform for Development of Multiblock PDE Solvers,” Technical Report AFM 92-05, Technical University of Denmark.
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Figures

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The coarse O-mesh M1 used for the 2D-plate computations, the lower part of the figure shows a detail of the mesh near the plate
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Example of the mesh used for the flat plate 3D computations, the radius of the outer dome is approximately 25 times the width of the plate
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Mesh detail near the “tip” of the plate showing the square block used to resolve the tip region. The thickness of the plate in the plot has been scaled and only every third grid line are shown to remove cluttering of the grid lines
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The spanwise drag distribution of the three flat plates, only one half of the plate span is shown
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Iso-contours of the absolute value of the vorticity behind the plate with aspect ratio 40
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The planform of the four blades
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The variation of the thickness to chord ratio along the blade span for the four blades
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The variation of the twist along the blade span for the four blades
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Example of the mesh used for the LM8.2 computations
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Comparison of computed drag for the plates and blades with measured values for plates and cylinders
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Computed drag variation along the blade span for the four blades
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Iso-contours of the absolute value of the vorticity behind the LM19.1 blade

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