Onset of wake meandering for a floating offshore wind turbine under side-to-side motion

doi:10.1017/jfm.2021.1147

CORC > 力学研究所 > 中国科学院力学研究所 > 非线性力学国家重点实验室

	Onset of wake meandering for a floating offshore wind turbine under side-to-side motion
	Li, Zhaobin 1,2; Dong, Guodan 1,2; Yang, Xiaolei 1,2
刊名	JOURNAL OF FLUID MECHANICS
	2022-01-18
卷号	934 页码:43
关键词	wakes shear-flow instability
ISSN号	0022-1120
DOI	10.1017/jfm.2021.1147
通讯作者	Yang, Xiaolei(xyang@imech.ac.cn)
英文摘要	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.
WOS关键词	LARGE-EDDY SIMULATION ; BOUNDARY-LAYER ; STABILITY ANALYSIS ; TUNNEL ; DYNAMICS ; AERODYNAMICS ; PITCH ; FARM
WOS研究方向	Mechanics ; Physics
语种	英语
WOS记录号	WOS:000744444300001
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/88405]
专题	力学研究所_非线性力学国家重点实验室
通讯作者	Yang, Xiaolei
作者单位	1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Mech, Stale Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Li, Zhaobin,Dong, Guodan,Yang, Xiaolei. Onset of wake meandering for a floating offshore wind turbine under side-to-side motion[J]. JOURNAL OF FLUID MECHANICS,2022,934:43.
APA	Li, Zhaobin,Dong, Guodan,&Yang, Xiaolei.(2022).Onset of wake meandering for a floating offshore wind turbine under side-to-side motion.JOURNAL OF FLUID MECHANICS,934,43.
MLA	Li, Zhaobin,et al."Onset of wake meandering for a floating offshore wind turbine under side-to-side motion".JOURNAL OF FLUID MECHANICS 934(2022):43.