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Gravo-aeroelastically-scaled demonstrator field tests to represent blade response of a flexible extreme-scale downwind turbine

Author

Listed:
  • Kaminski, Meghan
  • Simpson, Juliet
  • Loth, Eric
  • Fingersh, Lee Jay
  • Scholbrock, Andy
  • Johnson, Nick
  • Johnson, Kathryn
  • Pao, Lucy
  • Griffith, Todd

Abstract

Operational experimental testing results for a 44.5 m diameter wind turbine rotor were obtained to investigate moments and deflections of a downwind, coned wind turbine with lightweight flexible blades. These results were non-dimensionally compared against OpenFAST predictions of the manufactured sub-scale rotor as well as the full-scale concept rotor. The full-scale, 13-MW Segmented Ultralight Morphing Rotor is a 2-bladed downwind rotor with load aligned blades. The 1/5th sub-scale demonstrator rotor (SUMR-D) was designed to match the nondimensional gravo-aeroelastic flapwise loads, deflections, and dynamics of its full-scale counterpart. The sub-scale model was tested at the National Renewable Energy Laboratory's Flatirons Campus (NREL FC) with gusts that are 2.6 times higher than that of a scaled environment. To withstand the site conditions, the manufactured SUMR-D rotor employed higher inboard mass density and stiffness relative to that of an ideally-scaled model. The experimental results are compared against computational non-dimensional characteristics: tip-speed ratios, RPM, tip deflections, and flapwise bending moments. Despite the robust blades for NREL FC testing, the sub-scale experimental model was found to reasonably represent the dynamics predicted by OpenFAST. These results demonstrate the potential of low-cost high-fidelity sub-scale testing for novel extreme-scale turbine designs.

Suggested Citation

  • Kaminski, Meghan & Simpson, Juliet & Loth, Eric & Fingersh, Lee Jay & Scholbrock, Andy & Johnson, Nick & Johnson, Kathryn & Pao, Lucy & Griffith, Todd, 2023. "Gravo-aeroelastically-scaled demonstrator field tests to represent blade response of a flexible extreme-scale downwind turbine," Renewable Energy, Elsevier, vol. 218(C).
    • Handle: RePEc:eee:renene:v:218:y:2023:i:c:s0960148123011321
    DOI: 10.1016/j.renene.2023.119217
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    References listed on IDEAS

    as
    1. Kaminski, Meghan & Loth, Eric & Griffith, D. Todd & Qin, Chao (Chris), 2020. "Ground testing of a 1% gravo-aeroelastically scaled additively-manufactured wind turbine blade with bio-inspired structural design," Renewable Energy, Elsevier, vol. 148(C), pages 639-650.
    2. Yao, Shulong & Griffith, D. Todd & Chetan, Mayank & Bay, Christopher J. & Damiani, Rick & Kaminski, Meghan & Loth, Eric, 2020. "A gravo-aeroelastically scaled wind turbine rotor at field-prototype scale with strict structural requirements," Renewable Energy, Elsevier, vol. 156(C), pages 535-547.
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