Experimental and Numerical Study of a New Dynamic Phenomenon for Two-bladed Wind Turbines

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 start whirling during rotor rotation. The whirling for two-bladed rotors change with multiple P contributions and not only ±1P as is previously seen for three-bladed wind turbine rotors. A three-bladed turbine was also analyzed in similar way and results were compared. This turbine was investigated both in a perfect isotropic condition where all blades have identical properties as well as an imbalanced edition where one blade had increased mass.
Original languageEnglish
JournalProceedings of the International Offshore and Polar Engineering Conference
Pages (from-to)547-553
Publication statusPublished - 2015
Event25th International Ocean and Polar Engineering Conference - Kona, United States
Duration: 21 Jun 201526 Jun 2015


Conference25th International Ocean and Polar Engineering Conference
Country/TerritoryUnited States
Internet address


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


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