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Fundamental study on aerodynamic force of floating offshore wind turbine with cyclic pitch mechanism

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  • Li, Qing'an
  • Kamada, Yasunari
  • Maeda, Takao
  • Murata, Junsuke
  • Iida, Kohei
  • Okumura, Yuta

Abstract

Wind turbines mounted on floating platforms are subjected to completely different and soft foundation properties, rather than onshore wind turbines. Due to the flexibility of their mooring systems, floating offshore wind turbines are susceptible to large oscillations such as aerodynamic force of the wind and hydrodynamic force of the wave, which may compromise their performance and structural stability. This paper focuses on the evaluation of aerodynamic forces depending on suppressing undesired turbine's motion by a rotor thrust control which is controlled by pitch changes with wind tunnel experiments. In this research, the aerodynamic forces of wind turbine are tested at two kinds of pitch control system: steady pitch control and cyclic pitch control. The rotational speed of rotor is controlled by a variable speed generator, which can be measured by the power coefficient. Moment and force acts on model wind turbine are examined by a six-component balance. From cyclic pitch testing, the direction and magnitude of moment can be arbitrarily controlled by cyclic pitch control. Moreover, the fluctuations of thrust coefficient can be controlled by collective pitch control. The results of this analysis will help resolve the fundamental design of suppressing undesired turbine's motion by cyclic pitch control.

Suggested Citation

  • Li, Qing'an & Kamada, Yasunari & Maeda, Takao & Murata, Junsuke & Iida, Kohei & Okumura, Yuta, 2016. "Fundamental study on aerodynamic force of floating offshore wind turbine with cyclic pitch mechanism," Energy, Elsevier, vol. 99(C), pages 20-31.
    • Handle: RePEc:eee:energy:v:99:y:2016:i:c:p:20-31
    DOI: 10.1016/j.energy.2016.01.049
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    References listed on IDEAS

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