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Numerical investigation of the influence of shear and thermal stratification on the wind turbine tipâvortex stability
- Source :
- Wind Energy. 25:1270-1289
- Publication Year :
- 2022
- Publisher :
- Wiley, 2022.
-
Abstract
- The interaction between wind turbine wakes and atmospheric turbulence is characterised by complex dynamics. In this study, two major components of the atmospheric boundary layer dynamics have been isolated, namely, the mean velocity profile shear and the thermal stratification, to examine their impact on the near-wake development by undertaking a series of highly resolved large-eddy simulations. Subsequently, instantaneous flow fields are extracted from the simulations and used to conduct Fourier analysis and proper orthogonal decomposition (POD) and compute the mean kinetic energy fluxes by different POD modes to better understand the tip-vortex instability mechanisms. Our findings indicate that shear can significantly affect the breakup of the wind turbine tip-vortices as well as the shape and stable length of the wake, whereas thermal stratification seems to only have limited contribution to the spatial development of the near-wake field. Finally, our analysis shows that the applied perturbation frequency determines the tip-vortex breakup location as it controls the onset of the mutual inductance instability.
- Subjects :
- Technology
near-wake field
Science & Technology
LARGE-EDDY SIMULATION
Energy
Energy & Fuels
IMPACT
Renewable Energy, Sustainability and the Environment
stable wake length
tip-vortex stability
SCHEMES
BOUNDARY-LAYER
shear
0915 Interdisciplinary Engineering
Physics::Fluid Dynamics
Engineering, Mechanical
thermal stratification
WAKES
0906 Electrical and Electronic Engineering
Engineering
MULTIPLE
TURBULENCE
VORTICES
0913 Mechanical Engineering
Subjects
Details
- ISSN :
- 10991824 and 10954244
- Volume :
- 25
- Database :
- OpenAIRE
- Journal :
- Wind Energy
- Accession number :
- edsair.doi.dedup.....1fd62694a05ec185dc9bcb3dcf57974d