Wake topology and energy recovery in floating horizontal-axis wind turbines with harmonic surge motion

Lei Duan, Qinghong Sun, Zanyang He and Gen Li

Energy, 2022, vol. 260, issue C

Abstract: Floating horizontal-axis wind turbines (FHAWTs) enable us to harvest offshore wind energy in deep water area. Although the wake structure of an FHAWT causes secondary effects on its own aerodynamic performance, the wake characteristics are significant in both the performance of rear FHAWTs and the layout of floating wind farms, however, not sufficiently understood so far. To this end, a parametric numerical study is conducted to investigate the FHAWT's wake characteristics influenced by platform's surge motion. An improved delayed detached eddy simulation (IDDES) is applied on a 1/50 scale rotor of NREL 5 MW wind turbine, showing that surge motion evidently influences FHAWT's wake structure, as well as its' energy recovery. Specifically, the surge period is the predominant factor that influences FHAWT's wake topology. In addition, the unique vortex ring structures in the wake of the FHAWT under surge motion is reported for the first time. Moreover, the energy recovery of the FHAWT's wake depends on the surge period principally, and may be faster or slower than that of fixed-bottom wind turbines at different positions, indicating that the interval between two adjacent FHAWTs in floating wind farms should be considered carefully depending on prevailing or unprevailing wind directions.

Keywords: Floating horizontal-axis wind turbine; Surge motion; Wake topology; Energy recovery; Computational fluid dynamics; Improved delayed detached eddy simulation (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (7)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:260:y:2022:i:c:s0360544222018096

DOI: 10.1016/j.energy.2022.124907

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