11 Sep 2023
 | 11 Sep 2023
Status: this preprint is currently under review for the journal WES.

Floating wind turbine motions signature in the far-wake spectral content – A wind tunnel experiment

Benyamin Schliffke, Boris Conan, and Sandrine Aubrun

Abstract. The growing interest in floating offshore wind turbines (FOWTs) is rooted in the potential source for increased offshore energy production. As the technology is still in a pre-industrial state, several questions remain to be addressed where little field data is available. This study uses physical modelling at a reduced scale to investigate the signature of the floating motions into the wake spectral content of a simplified FOWT model. A wind turbine model based on the actuator disc concept is placed in an atmospheric boundary layer wind tunnel and subjected to a range of surge, heave and pitch motions. The signatures of idealised sinusoidal motion and realistic broad-band motion on the model’s wake at distance of 4.6 D (D being the disc diameter) and 8 D are measured through the use of a rake of single hot-wires. The spectral analysis shows that harmonic motion leaves to clear signatures in the far-wake's energy spectra, mainly in the top tip region, while broad-band motion does not leave easily detectable signatures.

Benyamin Schliffke et al.

Status: open (until 14 Oct 2023)

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Benyamin Schliffke et al.

Benyamin Schliffke et al.


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Short summary
The paper studies the consequences of floater motions on the wake properties of a floating wind turbine. Since wakes interactions are responsible of power production loss in wind farms, it is important de know whether the tools that are used to predict this production loss need to be upgraded to take into account these aspects. Our wind tunnel study shows that the signature of harmonic floating motions can be observed in the far-wake of a wind turbine, when motions have strong amplitudes.