Low-dimensional representations and anisotropy of model rotor versus porous disk wind turbine arrays

Camp, Elizabeth; Cal, Raúl Bayoán

doi:10.1103/physrevfluids.4.024610

Cited by 22 publications

(14 citation statements)

References 44 publications

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“…Journal of Renewable and Sustainable Energy ARTICLE scitation.org/journal/rse Cal. 50,51 They used a 3 Â 4 array of turbines and disks, and did particle image velocimetry (PIV) around the center turbine in the last row. In the far wake, the mean kinetic energy transport is captured well by the PD.…”

Section: Wind Farmmentioning

confidence: 99%

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The far wake of porous disks and a model wind turbine: Similarities and differences assessed by hot-wire anemometry

Vinnes

Gambuzza

Ganapathisubramani

et al. 2022

Journal of Renewable and Sustainable Energy

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The wakes of two different porous disks have been evaluated experimentally. Such disks are commonly used as physical actuator disk analogs for wind turbines. One disk is made of a uniform wire mesh, while the other has a nonuniform design with radial spars connected by rings. The disks have the same solidity and produce approximately the same drag. The wakes have also been compared to the wake of a model wind turbine and a solid disk. In contrast to earlier studies, the far wake, up to 30 diameters downstream, is included in the comparison. In the near wake, the velocity deficit and turbulence intensity profiles of the disk wakes differ significantly. High levels of turbulence intensity in the wake of the nonuniform disk increase the transverse transport in the wake, which leads to faster spreading and lower velocity deficits in the far wake, compared to the uniform disk and the wind turbine. High velocity gradients in the wake of the uniform disk give rise to turbulence production farther downstream, maintaining higher turbulence levels in the far wake. In addition, coherent vortex shedding is only identified in the wake of the nonuniform disk. None of the disks were able to replicate the asymmetric features of the wind turbine wake. Nonetheless, the results highlight important flow physics that should be considered in the design process of a porous disk used as a wind turbine surrogate.

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Section: Wind Farmmentioning

confidence: 99%

“…The design is based on the nonuniform disk used by Aubrun et al 53 and Camp and Cal. 50,51 The ND was machined from a 5 mm thick acrylic sheet to match the diameter and solidity of the UD. Schematics of the UD and ND are shown in Fig.…”

Section: Experimental Setup a Disks And Wind Turbinementioning

confidence: 99%

The far wake of porous disks and a model wind turbine: Similarities and differences assessed by hot-wire anemometry

Vinnes

Gambuzza

Ganapathisubramani

et al. 2022

Journal of Renewable and Sustainable Energy

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“…The application of appropriate orthogonal decomposition (POD) puts more emphasis on intermediate scales in the wake close to the rotor case compared to the disk case. These differences are attenuated in the far wake 6 …”

Section: Introductionmentioning

confidence: 99%

“…Characterization of the wake has therefore been the subject of numerous studies 3,4 . Following an experimental study in a wind tunnel, the mean kinetic energy transport within the wakes and the wake structures generated by an array of porous disks and three‐bladed wind turbines were analyzed 5,6 . The application of appropriate orthogonal decomposition (POD) puts more emphasis on intermediate scales in the wake close to the rotor case compared to the disk case.…”

Section: Introductionmentioning

confidence: 99%

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Numerical study of the wake induced by a porous disk under deflected inflow

2022

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This study examines the wake of a porous disk that generates a velocity deficit equivalent to that of a wind turbine. Three-dimensional unsteady numerical simulations based on the finite volume method are performed. The URANS-SST (k-ω) model is applied for the turbulence closure. Two investigations are carried out in this study: (i) the influence of the disk porosity on the wake, for porosities values (p) ranging from 0 to 0.55 in the case of a perpendicular flow; and (ii) the influence of the yaw angle on the wake deviation, for yaw angles ranging from 5°to 30°. Good agreements with the available experimental data are obtained for the mean x-velocity component. The results confirm that wake length increases as porosity decreases. For nonporous disks, most part of the fluid is deflected toward the mast and above the disk. The y-velocity contours highlight two contra-rotating vortices in the vicinity of the disk. In both cases (nonporous and porous disks), a high turbulent kinetic energy is obtained near the disk area, with a higher maximum value for the nonporous disk.

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The flow in the induction and entrance regions of lab‐scale wind farms

et al. 2023

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With the increasing demand for wind energy, it is important to be able to understand and predict the available wind resources. To that end, the present wind tunnel study addresses the flow in the induction and entrance region of wind farms through particle image velocimetry, with focus on differences between actuator disks and two‐bladed rotating wind turbine models. Both staggered and aligned farm layouts are examined for three different incoming wind directions. For each layout, 69 disks or turbines are used, and the field of view ranges from 12 rotor diameters upstream of the farms to 8 diameters downstream of the first row. The results show that the induction, or blockage effect, is higher for the disks, even though the thrust (or drag) coefficient is the same. In contrast, the wake is stronger downstream of the turbines. The orientation and layout of the farm do not have a major impact on the results. Modal decomposition of the flow shows that the flow structure similarity between the disk and turbines improves downstream of the second row of wake generating objects, indicating that the substitution of wind turbines by actuator disks is more appropriate for wind farms than for the investigation of single wakes.

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Low-dimensional representations and anisotropy of model rotor versus porous disk wind turbine arrays

Cited by 22 publications

References 44 publications

The far wake of porous disks and a model wind turbine: Similarities and differences assessed by hot-wire anemometry

The far wake of porous disks and a model wind turbine: Similarities and differences assessed by hot-wire anemometry

Numerical study of the wake induced by a porous disk under deflected inflow

The flow in the induction and entrance regions of lab‐scale wind farms

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