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Experimental investigation of aerodynamic-effect-induced dynamic characteristics of an OC4 semi-submersible floating wind turbine

Lookup NU author(s): Professor Zhiqiang Hu

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This is the authors' accepted manuscript of an article that has been published in its final definitive form by Sage Publications Ltd, 2018.

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Abstract

Compared to onshore wind turbines, aerodynamics-induced dynamic characteristics of a floating wind turbine are more complicated due to its coupled aero-hydro-servo-elastic behaviours. The study investigates these aerodynamics-induced dynamic characteristics using an OC4 semi-submersible floating wind turbine. In this research, a high-fidelity wind field and a 1/50^th scale model were tested. The dynamic characteristics induced by the aerodynamic effects were investigated in detail via the experimental results, including aerodynamic damping effect, gyroscopic effect, dynamic responses of the Rotor-Nacelle-Assembly and dynamic responses of the mooring system. It was found that aerodynamic damping is active in reducing surge and pitch resonant responses and probably increases with the inflow wind speed and the rotating-blades induced induction coefficient; the gyroscopic effect intensifies the yaw motion and increases with therotate speed of a rotor; the significant responses from Rotor-Nacelle-Assembly may occur when the natural frequencies of the tower are close to some of the aerodynamic periodic frequencies; and the mooring system is more sensitive to the wave exciting forces than to the aerodynamic loads. This study presents the complexity of the dynamic characteristics induced by the aerodynamic effects in the floating wind turbine, and in the design code, using a time-domain analysis software, which considers the coupling between the wind- and wave-induced loads and responses are suggested.

Publication metadata

Author(s): Chen J, Hu Z

Publication type: Article

Publication status: Published

Journal: Journal of Engineering for the Maritime Environment

Year: 2018

Volume: 232

Issue: 1

Pages: 19-36

Print publication date: 01/02/2018

Online publication date: 29/04/2017

Acceptance date: 23/03/2017

Date deposited: 30/03/2017

ISSN (print): 1475-0902

ISSN (electronic): 2041-3084

Publisher: Sage Publications Ltd

URL: https://doi.org/10.1177/1475090217706194

DOI: 10.1177/1475090217706194

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