Preprints
https://doi.org/10.5194/wes-2021-132
https://doi.org/10.5194/wes-2021-132
 
23 Dec 2021
23 Dec 2021
Status: this preprint is currently under review for the journal WES.

Flutter Behavior of Highly Flexible Two- and Three-bladed Wind Turbine Rotors

Mayank Chetan, Shulong Yao, and D. Todd Griffith Mayank Chetan et al.
  • UTD Center for Wind Energy, Department of Mechanical Engineering, The University of Texas at Dallas, Richardson, Texas, USA

Abstract. With the progression of novel design, material, and manufacturing technologies, the wind energy industry has successfully produced larger and larger wind turbine rotor blades while driving down the Levelized Cost of Energy (LCOE). Though the benefits of larger turbine blades are appealing, larger blades are prone to aero-elastic instabilities due to their long, slender, highly flexible nature, and this effect is accentuated as rotors further grow in size. In addition to the trend of larger rotors, new rotor concepts are emerging including two-bladed rotors and downwind configurations. In this work, we introduce a comprehensive evaluation of flutter behavior including classical flutter, edgewise vibration, and flutter mode characteristics for two-bladed, downwind rotors. Flutter speed trends and characteristics for a series of both two- and three-bladed rotors are analyzed and compared in order to illustrate the flutter behavior of two-bladed rotors relative to more well-known flutter characteristics of three-bladed rotors. In addition, we examine the important problem of blade design to mitigate flutter and present a solution to mitigate flutter in the structural design process. A study is carried out evaluating the effect of leading edge and trailing edge reinforcement on flutter speed and hence demonstrates the ability to increase the flutter speed and satisfy structural design requirements (such as fatigue) while maintaining or even reducing blade mass.

Mayank Chetan et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on wes-2021-132', Anonymous Referee #1, 05 Feb 2022
  • RC2: 'Reviewer comment on wes-2021-132', Anonymous Referee #2, 23 May 2022

Mayank Chetan et al.

Mayank Chetan et al.

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Short summary
Though large wind turbines are appealing to reduce costs, larger blades are prone to aero-elastic instabilities due to their long, slender, highly flexible nature. And, new rotor concepts are emerging including two-bladed rotors and downwind configurations. We introduce a comprehensive evaluation of flutter behavior including classical flutter and edgewise vibration for large-scale two-bladed rotors. The study aims to provide designers with insights to mitigate flutter in future designs.