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Wake structures and performances of wind turbine rotor with harmonic surging motions under laminar and turbulent inflows
  • Wei YU,
  • YuanTso Li,
  • Hamid Sarlak Chivaee
Wei YU
Technische Universiteit Delft Faculteit Luchtvaart- en Ruimtevaarttechniek

Corresponding Author:[email protected]

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YuanTso Li
Danmarks Tekniske Universitet - Riso Campus
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Hamid Sarlak Chivaee
Danmarks Tekniske Universitet - Riso Campus
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Abstract

Previous numerical studies suggested the motions of Floating Offshore Wind Turbines (FOWTs) may enhance their wake recovery rates due to having different modes of wake dynamics from the bottom-mounted counterparts. However, the majority of previous research were conducted with models having relatively low fidelities and/or focusing on laminar inflow conditions. Models with lower fidelities are not able to capture the dynamics of tip-vorticies reliably while inflow conditions without turbulence are unrealistic out in the fields. In light of this, this paper performed high fidelity numerical simulations (large eddy simulation with actuator line technique) using full scale surging (prescribed and harmonic) FOWT rotor with different inflow turbulence intensities and multiple surging settings systematically to better understand the wake dynamics of FOWT. The results showed that the differences of wake structures between fixed and (harmonic) surging rotors were pronounced when under laminar inflow conditions, where the Surging Induced Periodic Coherent Structures (SIPCS) could be detected straightforwardly; while the differences were much less significant when under inflow conditions with realistic turbulence intensities, and the SIPCS were clearly revealed only after phase-locked averaging. Moreover, when under laminar inflow conditions, the values of mean disk-averaged streamwise velocity at x/D=8 could be above 30% larger for the surging cases than the fixed case, while the increases were down to around 0 .5∼2% when under inflow conditions with realistic turbulence intensities.
Submitted to Wind Energy
25 Jan 20241st Revision Received
26 Jan 2024Submission Checks Completed
26 Jan 2024Assigned to Editor
26 Jan 2024Review(s) Completed, Editorial Evaluation Pending
01 Jul 20242nd Revision Received
04 Jul 2024Submission Checks Completed
04 Jul 2024Assigned to Editor
04 Jul 2024Review(s) Completed, Editorial Evaluation Pending
01 Aug 2024Reviewer(s) Assigned
10 Aug 2024Editorial Decision: Accept