| Onset of wake meandering for a floating offshore wind turbine under side-to-side motion | |
Li ZB(李曌斌); Dong GD(董国丹); Yang XL(杨晓雷)
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| Corresponding Author | Yang, Xiaolei([email protected]) |
| Source Publication | JOURNAL OF FLUID MECHANICS
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| 2022-01-18 | |
| Volume | 934Pages:43 |
| ISSN | 0022-1120 |
| Abstract | Wind turbine wakes, being convectively unstable, may behave as an amplifier of upstream perturbations and make downstream turbines experience strong inflow fluctuations. In this work, we investigate the effects of the side-to-side motion of a floating offshore wind turbine (FOWT) on wake dynamics using large-eddy simulation and linear stability analysis (LSA). When the inflow turbulence intensity is low, simulation results reveal that the turbine motion with certain Strouhal numbers St = fD/U-infinity is an element of (0.2, 0.6) (where f is the motion frequency, D is the rotor diameter, and U-infinity is the incoming wind speed), which overlap with the Strouhal numbers of wake meandering induced by the shear layer instability, can lead to wake meandering with amplitudes being one order of magnitude larger than the FOWT motion for the most unstable frequency. For high inflow turbulence intensity, on the other hand, the onset of wake meandering is dominated by the inflow turbulence. The probability density function of the spanwise instantaneous wake centres is observed being non-Gaussian and closely related to that of the side-to-side motion. This complements the existing wake meandering mechanisms, that the side-to-side motion of an FOWT can be a novel origin for the onset of wake meandering. It is also found that LSA can predict the least stable frequencies and the amplification factor with acceptable accuracy for motion amplitude 0.01D. Effects of nonlinearity are observed when motion amplitude increases to 0.04D, for which the most unstable turbine oscillations shift slightly to lower frequencies and the amplification factor decreases. |
| Keyword | wakes shear-flow instability |
| DOI | 10.1017/jfm.2021.1147 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000744444300001 |
| WOS Keyword | LARGE-EDDY SIMULATION ; BOUNDARY-LAYER ; STABILITY ANALYSIS ; TUNNEL ; DYNAMICS ; AERODYNAMICS ; PITCH ; FARM |
| WOS Research Area | Mechanics ; Physics |
| WOS Subject | Mechanics ; Physics, Fluids & Plasmas |
| Classification | 一类/力学重要期刊 |
| Ranking | 1 |
| Contributor | Yang, Xiaolei |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/88406 |
| Collection | 非线性力学国家重点实验室 |
| Recommended Citation GB/T 7714 | Li ZB,Dong GD,Yang XL. Onset of wake meandering for a floating offshore wind turbine under side-to-side motion[J]. JOURNAL OF FLUID MECHANICS,2022,934:43.Rp_Au:Yang, Xiaolei |
| APA | 李曌斌,董国丹,&杨晓雷.(2022).Onset of wake meandering for a floating offshore wind turbine under side-to-side motion.JOURNAL OF FLUID MECHANICS,934,43. |
| MLA | 李曌斌,et al."Onset of wake meandering for a floating offshore wind turbine under side-to-side motion".JOURNAL OF FLUID MECHANICS 934(2022):43. |
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| Jp2022FA553_2022_Ons（2891KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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