Lead Session Chair:
Stephan Barth, Managing Director, ForWind - Center for Wind Energy Research, Germany
Zhengshun Cheng (2) F P Kai Wang (3) Zhen Gao (4) Torgeir Moan (4)
(1) Norwegian University of Science and Technology, Trondheim, Norway (2) Department of Marine Technology/CeSOS, NTNU, Trondheim, Norway (3) NOWITECH/CeSOS, NTNU, Trondheim, Norway (4) CeSOS/AMOS, NTNU, Trondheim, Norway
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Presenter's biographyBiographies are supplied directly by presenters at OFFSHORE 2015 and are published here unedited
Mr. Zhengshun Cheng is currently a Ph.D. candidate at the Department of Marine Technology and Centre for Ships and Ocean Structures in Norwegian University of Science and Technology, Norway. He received his BSc and MSc in Ocean Engineering from Shanghai Jiao Tong University, China in 2010 and 2013, respectively. His research is mainly focusing on the integrated modelling and analysis of floating horizontal and vertical axis wind turbine.
Comparative study of Spar type floating horizontal and vertical axis wind turbines subjected to constant winds
As wind farms are moving forward to deep waters, different floating horizontal axis wind turbine (FHAWT) concepts have been put forward and have been widely investigated. Floating vertical axis wind turbines (FVAWT) are also very promising for harvesting wind energy in deep waters. It’s therefore very interesting to comparatively study the global performance of FHAWT and FVAWT.
In the present study, a FVAWT with a 5MW Darrieus rotor mounted the OC3 Hywind Spar platform was proposed. Comparative study of the FHAWT with a 5MW NREL wind turbine and the FVAWT with a 5MW Darrieus rotor, both supported by the OC3 Hywind Spar, were carried out. The ballast of the Spar platform supporting the FVAWT was rearranged to retain the same draft and displacement. The state-of-the-art time domain code Simo-Riflex-AeroDyn and Simo-Riflex-DMS were adopted for fully coupled nonlinear time domain simulations.
Main body of abstract
A number of load cases were selected to calculate the dynamic responses of the FHAWT system and the FVAWT system, including free decay cases, wind only cases, wave only cases and combined wind and wave cases. The free decay simulations show the natural periods of the FHAWT and FVAWT systems. The steady wind only simulations could be used to study the dynamic responses of the floating wind turbines due to the aerodynamic loads. The irregular wave only cases shows the effects of hydrodynamic loads on the dynamic responses for the floating wind turbines. The simulations with steady wind and irregular wave illustrates the combined effects of aerodynamic loads and hydrodynamic loads on the dynamic responses. The simulations with turbulent wind and irregular wave reveal the global dynamic responses of the FHAWT and FVAWT systems in the met-ocean environment.
The present study addresses the global dynamic response analysis of the FHAWT and the FVAWT with the same Spar floater. Comparative study of the FHAWT and FVAWT captures and demonstrates the different characteristics of the floating wind turbines.
The present research gives more insights into the difference between the FHAWT and the FVAWT concepts and can serve as a basis for the further developments of these two concepts.