Experimental and Numerical Study of Rotor Dynamics of a Two- and Three-Bladed Wind Turbine

Torben J. Larsen, Taeseong Kim

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In this paper the dynamics of a two-bladed turbine is investigated numerically as well as experimentally with respect to how the turbine frequencies change with the rotor speed. It is shown how the turbine frequencies of a two-bladed rotor change with the azimuthal position at standstill and how the frequencies change due to rotor rotation. The frequency of the asymmetric rotor modes changes with multiple P contributions, not only with ±1P, as has previously been seen for threebladed wind turbine rotors. A three-bladed turbine is also analyzed in a similar way, and the results are compared. This turbine is investigated both in a perfect isotropic condition, where all blades have identical properties, and in an imbalanced edition, where one blade had increased mass.
Original languageEnglish
JournalInternational Journal of Offshore and Polar Engineering
Issue number4
Pages (from-to)355–361
Publication statusPublished - 2016


  • Wind turbine
  • Dynamics
  • Experiment
  • Imbalanced rotor
  • Campbell diagram
  • Two blades
  • Three blades


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