NDLI: A flexible turbine blade for passive blade pitch control in wind turbines

Content Provider	IEEE Xplore Digital Library
Author	MacPhee, D. Beyene, A.
Copyright Year	2011
Description	Author affiliation: Department of Mechanical Engineering, San Diego State University, California, USA, 92182 (MacPhee, D.) \|\| Department of Mechanical Engineering, San Diego State University, California, USA, 92192 (Beyene, A.)
Abstract	We present a flexible wind turbine blade that effectively pitches itself according to variable wind loading. In contrast to rigid turbine blades, where active controls are often required to pitch blades, the flexible or morphing blade adjusts its geometry passively, eliminating the need for costly electromechanical systems. We analyze the airfoil using a robust and accurate fluid-structure interaction routine, and introduce two morphing scenarios: one where rigid and flexible blade are identical when unloaded, and one where they are identical at the stall angle. We choose a single Reynolds number and a flexible airfoil material for a case study, and simulate over a range of attack angles, noting the lift and drag coefficients as well as the attack angle change through passive pitching of the flexible airfoil. It was found that the flexible airfoil can delay stall as well as significantly increase lift/drag ratios compared to the rigid blade. In addition, negligible increases in drag and large increases in lift were realized. This suggests that flexibility can be used as a design parameter for wind turbine blades, and would likely increase the operational range and/or part- or over-load efficiencies significantly.
Starting Page	196
Ending Page	199
File Size	99251
Page Count	4
File Format	PDF
ISBN	9781424496914
e-ISBN	9781424496907
DOI	10.1109/PEAM.2011.6134834
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-09-08
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Wind energy Blades Solids Wind turbines Automotive components Convergence
Content Type	Text
Resource Type	Article

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