Turbulence and wind turbines

Brand, A.J.; Peinke, Joachim; Mann, Jakob

doi:10.1088/1742-6596/318/7/072005

Cited by 21 publications

(18 citation statements)

References 20 publications

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“…Time could be a key factor for investigating how the changes induced by wind turbines on microclimate (Baidya Roy and Traiteur, 2010) may cascade to changes in vegetation structure (Brand et al 2011). Here, we reported the absence of wind turbine impact after five years of wind farm operation.…”

Section: Discussionmentioning

confidence: 63%

Do wind turbines impact plant community properties in mountain region?

et al. 2019

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The emergence of renewable energy infrastructures calls for a better understanding of their impact on biodiversity. The aim of the present study was to investigate in a mountain region the impact of a wind turbine on plant communities in their vicinity. A field survey was conducted in a wind farm situated in the Southern Romanian Carpathians, five years after the turbines were installed. We tested for the effects of the presence of the turbine and the distance to the turbine on plant species richness, on five plant ecological indicators and on the quality of the pastures. Overall, 33 plant species belonging to 16 families were recorded, and among them 21 were recorded in both the presence and the absence of wind turbine. The presence of a turbine did not affect the structure of the plant community, as the majority of the plots exhibited similar plant species richness and composition. Finally, the values of the ecological indicators and the pasture quality were not altered by the presence of the turbine. Such analyses could be extended over longer time periods so as to capture potential long-term effects and by integrating other environmental factors such as microclimatic conditions or soil properties.

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Section: Discussionmentioning

confidence: 63%

Do wind turbines impact plant community properties in mountain region?

et al. 2019

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“…The constant factor, K, represents contact stiffness and is determined from material properties and the geometry of the contact patch which forms between the bodies. Various analytical approximations have been developed (Antoine et al, 2006;Brewe and Hamrock, 1977) which allow for fast evaluation of the terms necessary for determining contact geometry and K itself with minimal error. Tangential forces due to friction and lubrication conditions are then given by…”

Section: Hertzian Elastic Contact Theorymentioning

confidence: 99%

A review of wind turbine main bearings: design, operation, modelling, damage mechanisms and fault detection

et al. 2020

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This paper presents a review of existing theory and practice relating to main bearings for wind turbines. The main bearing performs the critical role of supporting the turbine rotor, with replacements typically requiring its complete removal. The operational conditions and loading for wind turbine main bearings deviate significantly from those of more conventional power plants and other bearings present in the wind turbine power train, i.e. those in the gearbox and generator. This work seeks to thoroughly document current main-bearing theory in order to allow for appraisal of existing design and analysis practices, while also seeking to form a solid foundation for future research in this area. The most common main-bearing setups are presented along with standards for bearing selection and rating. Typical loads generated by a wind turbine rotor, and subsequently reacted at the main bearing, are discussed. This is followed by the related tribological theories of lubrication, wear and associated failure mechanisms. Finally, existing techniques for bearing modelling, fault diagnosis and prognosis relevant to the main bearing are presented.Published by Copernicus Publications on behalf of the European Academy of Wind Energy e.V.

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“…Here the modeling of the rotor is less critical, and the flow is dominated by convective and turbulent diffusion. The wake deficit is primarily Gaussian and the turbulence are isotropic [12]. The research topics associated with this regime primarily focus on wake evolution, wake interference, and turbulence modeling [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Validation of Tidal Stream Turbine Wake Predictions and Analysis of Wake Recovery Mechanism

Salunkhe

Fajri

O'Doherty

et al. 2019

JMSE

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This paper documents the predictive capability of rotating blade-resolved unsteady Reynolds averaged Navier-Stokes (URANS) and Improved Delayed Detached Eddy Simulation (IDDES) computations for tidal stream turbine performance and intermediate wake characteristics. Ansys/Fluent and OpenFOAM simulations are performed using mixed-cell, unstructured grids consisting of up to 11 million cells. The thrust, power and intermediate wake predictions compare reasonably well within 10% of the experimental data. For the wake predictions, OpenFOAM performs better than Ansys/Fluent, and IDDES better than URANS when the resolved turbulence is triggered. The primary limitation of the simulations is under prediction of the wake diffusion towards the turbine axis, which in return is related to the prediction of turbulence in the tip-vortex shear layer. The shear-layer involves anisotropic turbulent structures; thus, hybrid RANS/LES models, such as IDDES, are preferred over URANS. Unfortunately, IDDES fails to accurately predict the resolved turbulence in the near-wake region due to the modeled stress depletion issue.

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Turbulence and wind turbines

Abstract: Abstract. The nature of turbulent flow towards, near and behind a wind turbine, the effect of turbulence on the electricity production and the mechanical loading of individual and clustered wind turbines, and some future issues are discussed.

Cited by 21 publications

References 20 publications

Do wind turbines impact plant community properties in mountain region?

Do wind turbines impact plant community properties in mountain region?

A review of wind turbine main bearings: design, operation, modelling, damage mechanisms and fault detection

Validation of Tidal Stream Turbine Wake Predictions and Analysis of Wake Recovery Mechanism

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