Wind turbine wake aerodynamics

Vermeer, L. J.; Sørensen, Jens Nørkær; Crespo, António

doi:10.1016/s0376-0421(03)00078-2

Cited by 1,089 publications

(700 citation statements)

References 89 publications

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“…The region immediately after the rotor blade is called the near wake which influences the flow field around the rotor and the power extraction of a turbine (Vermeer et al, 2003). The fluid passing through a turbine rotor contributes its kinetic energy to the turbine shaft and forms a low energy wake region behind the rotor blade.…”

Section: Selection Of Area Ratios and Half Anglesmentioning

confidence: 99%

“…The effect of such complicated flows can be implemented in an approximate way in the BEM methods using empirical values from experimental results (Gaonkar and Peters, 1986;Hansen, 1992;Hasegawa et al, 1996;van Bussel, 1994). A better understanding of such flows however needs more representative models based on the experimental studies (Vermeer et al, 2003). To account for the effect of yaw angle in semi-empirical models like the prescribed wake description model (Robinson et al, 1995) and to use such a tool with confidence in designing horizontal axis turbines, experimental results need to be implemented in the models (Grant et al, 1997).…”

Section: Forewordmentioning

confidence: 99%

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Effect of shroud on the performance of horizontal axis hydrokinetic turbines

2015

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Section: Selection Of Area Ratios and Half Anglesmentioning

confidence: 99%

Section: Forewordmentioning

confidence: 99%

Effect of shroud on the performance of horizontal axis hydrokinetic turbines

2015

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“…In the far wake these vortices break down, and the smoke trails do not yield much useful data. Some experiments have been conducted using particle image velocimetry but these are also currently focused on near-wake measurements (Vermeer et al 2003). Wind tunnel tests have also been performed to show the effects of the tower on wake development, but measurements across the whole turbine were not taken (Nygard 2011).…”

Section: Wake Structure and Propagationmentioning

confidence: 99%

“…Due to this complexity most studies only analytically model parameters in a one-dimensional or axisymmetric fashion (Vermeer et al 2003). These simplified models are suitable for typical power prediction and layout optimisation but are too simple to properly predict unsteady loading and noise.…”

Section: Introductionmentioning

confidence: 99%

A discussion of wind turbine interaction and stall contributions to wind farm noise

Laratro

Arjomandi

Kelso

et al. 2014

Journal of Wind Engineering and Industrial Aerodynamics

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Elsevier's Policy: An author may use the preprint for personal use, internal institutional use and for permitted scholarly posting. ... Elsevier's AAM Policy: Authors retain the right to use the accepted author manuscript for personal use, internal institutional use and for permitted scholarly posting provided that these are not for purposes of commercial use or systematic distribution. Elsevier believes that individual authors should be able to distribute their AAMs for their personal voluntary needs and interests, e.g. posting to their websites or their institution's repository, e-mailing to colleagues. However, our policies differ regarding the systematic aggregation or distribution of AAMs to ensure the sustainability of the journals to which AAMs are submitted. Therefore, deposit in, or posting to, subject-oriented or centralized repositories (such as PubMed Central), or institutional repositories with systematic posting mandates is permitted only under specific agreements between Elsevier and the repository, agency or institution, and only consistent with the publisher's policies concerning such repositories. Voluntary posting of AAMs in the arXiv subject repository is permitted. ... Highlights-Rotor-wake interaction plays a role in wind farm noise -More wake data needs to be collected -Dynamic stall noise needs to be characterised AbstractWind farms have recently been reported to produce a noise signature that is described as possessing a "thumping" quality. Measurements of these signatures are limited and their effects are debated but their effect on public opinion and complaints make them a concern for researchers in this field. Proposed reasons for these noise signatures include amplitude modulation, interference patterns and wake-rotor interaction. This paper discusses these effects and concludes that wake-rotor interaction plays a role by causing variations in turbulent-inflow noise and dynamic stall. The current state of research into stall noise and wind turbine wake structure is also reviewed and it is concluded that the available information and collected data on wind turbine wake are insufficient to determine how strong this role is. More information on the velocity and turbulence fields in the wake of horizontal-axis wind turbines as well as a characterisation of the noise produced by an airfoil experiencing dynamic stall is required in order to make a full assessment of rotor-wake contributions to wind farm noise.2

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“…The distance downstream where the shear layer becomes thick enough to meet the turbine wake axis is used to mark the end of the near wake region and the start of the far wake. In wind turbine wake studies this transition point has been detected between two to five rotor diameters downstream of the turbine (Vermeer et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

A large scale model experimental study of a tidal turbine in uniform steady flow

2015

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An experimental study measuring the performance and wake characteristics of a 1:10 th scale horizontal axis turbine in steady uniform flow conditions is presented in this paper.Large scale towing tests conducted in a lake were devised to model the performance of the tidal turbine and measure the wake produced. As a simplification of the marine environment, towing the turbine in a lake provides approximately steady, uniform inflow conditions. A 16m long x 6m wide catamaran was constructed for the test programme. This doubled as a towing rig and flow measurement platform, providing a fixed frame of reference for measurements in the wake of a horizontal axis tidal turbine. Velocity mapping was conducted using Acoustic Doppler Velocimeters.The results indicate varying the inflow speed yielded little difference in the efficiency of the turbine or the wake velocity deficit characteristics provided the same tip speed ratio is used. Increasing the inflow velocity from 0.9 m/s to 1.2 m/s influenced the turbulent wake characteristics more markedly. The results also demonstrate that the flow field in the wake of a horizontal axis tidal turbine is strongly affected by the turbine support structure.

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Wind turbine wake aerodynamics

Cited by 1,089 publications

References 89 publications

Effect of shroud on the performance of horizontal axis hydrokinetic turbines

Effect of shroud on the performance of horizontal axis hydrokinetic turbines

A discussion of wind turbine interaction and stall contributions to wind farm noise

A large scale model experimental study of a tidal turbine in uniform steady flow

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