Model experiment of a SPAR type Offshore Wind Turbine in storm condition

Kentaroh Kokubun, Shigesuke Ishida, Tadashi Nimura, Toshiki Chujo, Shigeo Yoshida, Tomoaki Utsunomiya

Research output: Chapter in Book/Report/Conference proceedingConference contribution

14 Citations (Scopus)

Abstract

Wind power has the primary potential among renewable energies. Because Japan consists of little flat land and little shallow coast, floating wind turbine must be developed to make wind farms in Japan. Therefore, Japanese national demonstration project of Floating Offshore Wind Turbine (FOWT) was started in 2010FY by Ministry of the Environment and a SPAR-type FOWT is under construction at present. The floater is planned to be hybrid, consists of upper part by steal and lower part by pre-stressed concrete. Four fins are attached around the floater to suppress yaw motion. The floater is moored by three catenary chains. In order to confirm the safety of the FOWT in storm condition, experiments of a scale of 1/34.5 model were carried out at Ocean Engineering Basin of National Maritime Research Institute (NMRI), Japan. The draft of SPAR, the height of hub above sea level and the diameter of rotor of the model are 1.07m, 0.68m and 0.64m, respectively. In all experiments, blades are fixed to the hub under feathering condition and the hub is irrotational and fixed to the tower because this wind turbine is assumed to be under the storm condition, but wind blows transversely to the nacelle to give the maximum wind force. Water depth of the basin is smaller than the planned sea area on a reduced scale of model, therefore, springs and wires were used instead of chains in order to correspond to characteristics of horizontal mooring tension. Environmental forces are wind, wave and current in 50-year return period. Tensions of the 3 moorings and the motion of the model are measured in condition of wind and/or wave and/or current. Three kinds of direction of wind are adopted. One is the same direction as the wave and current, another is perpendicular to the wave and current, and the other is against to the wave and current. Besides the intact conditions a mooring-line-cut experiment in a storm condition was also conducted. Moreover, the effect of vortex induced motion (VIM), which occurs in current, was discussed. The results of the model experiment are reported to show the sufficient safety of this FOWT.

Original languageEnglish
Title of host publicationASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2012
Pages569-576
Number of pages8
Volume7
DOIs
Publication statusPublished - Dec 1 2012
Externally publishedYes
EventASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2012 - Rio de Janeiro, Brazil
Duration: Jul 1 2012Jul 6 2012

Other

OtherASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2012
CountryBrazil
CityRio de Janeiro
Period7/1/127/6/12

All Science Journal Classification (ASJC) codes

  • Ocean Engineering
  • Energy Engineering and Power Technology
  • Mechanical Engineering

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  • Cite this

    Kokubun, K., Ishida, S., Nimura, T., Chujo, T., Yoshida, S., & Utsunomiya, T. (2012). Model experiment of a SPAR type Offshore Wind Turbine in storm condition. In ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2012 (Vol. 7, pp. 569-576) https://doi.org/10.1115/OMAE2012-83993