Flutter performance of bend-twist coupled large-scale wind turbine blades

Khazar Hayat, Alvaro Gorostidi Martinez De Lecea, Carlos Donazar Moriones, SungKyu Ha

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The bend-twist coupling (BTC) is proven to be effective in mitigating the fatigue loads for large-scale wind turbine blades, but at the same time it may cause the risk of flutter instability. The BTC is defined as a feature of twisting of the blade induced by the primary bending deformation. In the classical flutter, the BTC arises from the aerodynamic loads changing with the angle of attack. In this study, the effects of the structural BTC on the flutter are investigated by considering the layup unbalances (ply angle, material and thickness of the composite laminates) in the NREL 5-MW wind turbine rotor blade of glass fiber/epoxy [02/+45/-45]S laminates. It is numerically shown that the flutter speed may decrease by about 5 percent with unbalanced ply-angle only (one side angle, from 45° to 25°). It was then demonstrated that the flutter performance of the wind turbine blade can be increased by using lighter and stiffer carbon fibers which ensures the higher structural BTC at the same time.

Original languageEnglish
Pages (from-to)149-162
Number of pages14
JournalJournal of Sound and Vibration
Volume370
DOIs
StatePublished - 2016 May 26

Fingerprint

flutter
turbine blades
wind turbines
Wind turbines
Turbomachine blades
Laminates
Aerodynamic loads
Flutter (aerodynamics)
laminates
Angle of attack
Glass fibers
Carbon fibers
aerodynamic loads
rotor blades
Rotors
Fatigue of materials
angle of attack
twisting
glass fibers
carbon fibers

Keywords

  • Aero-elasticity
  • Bend-twist coupling
  • Flutter
  • Large-scale blade

Cite this

Hayat, Khazar ; De Lecea, Alvaro Gorostidi Martinez ; Moriones, Carlos Donazar ; Ha, SungKyu. / Flutter performance of bend-twist coupled large-scale wind turbine blades. In: Journal of Sound and Vibration. 2016 ; Vol. 370. pp. 149-162.
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Flutter performance of bend-twist coupled large-scale wind turbine blades. / Hayat, Khazar; De Lecea, Alvaro Gorostidi Martinez; Moriones, Carlos Donazar; Ha, SungKyu.

In: Journal of Sound and Vibration, Vol. 370, 26.05.2016, p. 149-162.

Research output: Contribution to journalArticle

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