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Research Papers

Extension of a Helicoidal Vortex Model to Account for Blade Flexibility and Tower Interference

[+] Author and Article Information
Jean-Jacques Chattot

Department of Mechanical and Aeronautical Engineering, University of California Davis, One Shields Avenue, Davis, CA 95616jjchattot@ucdavis.edu

J. Sol. Energy Eng 128(4), 455-460 (Jun 19, 2006) (6 pages) doi:10.1115/1.2349546 History: Received March 01, 2006; Revised June 19, 2006

The unsteady vortex method has been extended to account for blade flexibility and tower interference. These are two potential sources of unsteadiness of the flow past a wind turbine blade. The cases presented correspond to an incoming flow speed V=5ms and low yaw angles and V=8, 10, and 12ms and zero yaw. Comparisons of the root flap bending moments predicted by the model with the National Renewable Energy Laboratory (NREL) experimental data indicate that the NREL blades designed for the wind tunnel campaigns are quite rigid and that the tower interference is responsible for unsteadiness that is well captured by the model for zero yaw as well as for yaw of 5, 10 and 20deg.

FIGURES IN THIS ARTICLE
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Copyright © 2006 by American Society of Mechanical Engineers
Topics: Vortices , Blades , Yaw , Plasticity
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References

Figures

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Figure 1

Comparison of rigid and flexible blade at V=5m∕s, yaw=0deg

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Figure 2

Comparison of rigid and flexible blade at V=5m∕s, yaw=5deg

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Figure 3

Comparison of rigid and flexible blade at V=5m∕s, yaw=10deg

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Figure 4

Sketch of the rotor, tower, and coordinate system

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Figure 11

Comparison of rigid and flexible blade with tower interference at V=12m∕s, yaw=0deg

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Figure 10

Comparison of rigid and flexible blade with tower interference at V=10m∕s, yaw=0deg

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Figure 9

Comparison of rigid and flexible blade with tower interference at V=8m∕s, yaw=0deg

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Figure 8

Comparison of rigid and flexible blade with tower interference at V=5m∕s, yaw=20deg

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Figure 7

Comparison of rigid and flexible blade with tower interference at V=5m∕s, yaw=10deg

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Figure 6

Comparison of rigid and flexible blade with tower interference at V=5m∕s, yaw=5deg

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Figure 5

Comparison of rigid and flexible blade with tower interference at V=5m∕s, yaw=0deg

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