Effect of chord-to-diameter ratio on vertical-axis wind turbine wake development

Parker, Colin M.; Araya, Daniel; Leftwich, Megan C.

doi:10.1007/s00348-017-2451-6

Cited by 18 publications

(12 citation statements)

References 23 publications

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“…In the center of this deflected wake, a reverse flow region, which extends from the rotor is observed. Similar reverse flow regions have been observed in previous studies of VAWTs [13,15,29,31].…”

Section: Velocity Field Around An Isolated Turbinesupporting

confidence: 88%

“…The majority of previous flow field measurements around VAWTs have been limited to planar techniques [2,12,[26][27][28][29]. A study by Caridi et al [30] investigated the tip vortices shed by single blades of a VAWT in three dimensions using time-resolved tomographic PIV, but the small field of view meant that properties of the overall flow field around the turbine were not measured.…”

Section: Introductionmentioning

confidence: 99%

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Aerodynamically Interacting Vertical-Axis Wind Turbines: Performance Enhancement and Three-Dimensional Flow

2019

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This study examined three-dimensional, volumetric mean velocity fields and corresponding performance measurements for an isolated vertical-axis wind turbine (VAWT) and for co- and counter-rotating pairs of VAWTs with varying incident wind direction and turbine spacings. The purpose was to identify turbine configurations and flow mechanisms that can improve the power densities of VAWT arrays in wind farms. All experiments were conducted at a Reynolds number of R e D = 7.3 × 10 4 . In the paired arrays, performance enhancement was observed for both the upstream and downstream turbines. Increases in downstream turbine performance correlate with bluff–body accelerations around the upstream turbine, which increase the incident freestream velocity on the downstream turbine in certain positions. Decreases in downstream turbine performance are determined by its position in the upstream turbine’s wake. Changes in upstream turbine performance are related to variations in the surrounding flow field due to the presence of the downstream rotor. For the most robust array configuration studied, an average 14% increase in array performance over approximately a 50° range of wind direction was observed. Additionally, three-dimensional vortex interactions behind pairs of VAWT were observed that can replenish momentum in the wake by advection rather than turbulent diffusion. These effects and their implications for wind-farm design are discussed.

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Section: Velocity Field Around An Isolated Turbinesupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Aerodynamically Interacting Vertical-Axis Wind Turbines: Performance Enhancement and Three-Dimensional Flow

2019

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“…The deployment of stereoscopic particle-image velocimetry (stereo-PIV) has allowed some three-dimensional effects to be captured (Tescione et al. 2014; Rolin & Porté-Agel 2015, 2018), as has the use of planar PIV with multiple imaging planes (Parker & Leftwich 2016; Araya, Colonius & Dabiri 2017; Parker, Araya & Leftwich 2017). These planar techniques have been successful in identifying characteristic vortex phenomena, such as dynamic stall on turbine blades (Ferreira et al.…”

Section: Introductionmentioning

confidence: 99%

“…Brochier, Fraunie & Beguierj 1986;Ferreira et al 2009;Battisti et al 2011). The deployment of stereoscopic particle-image velocimetry (stereo-PIV) has allowed some three-dimensional effects to be captured (Tescione et al 2014;Rolin & Porté-Agel 2015, 2018, as has the use of planar PIV with multiple imaging planes Araya, Colonius & Dabiri 2017;Parker, Araya & Leftwich 2017). These planar techniques have been successful in identifying characteristic vortex phenomena, such as dynamic stall on turbine blades (Ferreira et al 2009;Buchner et al 2015;Dunne & McKeon 2015;Buchner et al 2018) and tip-vortex shedding from the ends of individual blades (Hofemann et al 2008;Tescione et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Near-wake structure of full-scale vertical-axis wind turbines

Wei

Brownstein²,

Cardona

et al. 2021

J. Fluid Mech.

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“…VAWTs perform competitive advantages over their counterparts [1], especially a faster wake recovery leading to a more compact turbine arrangement and higher power density of wind farms [2]. However, strong blade-vortex interactions and complex unsteady wake structures are inherent attributes of VAWTs, which exert a significant influence on performance of wind turbines and wind farms [2][3][4]. Much research has been carried out and reported in previous literature that focuses on the wake of VAWTs.…”

Section: Introductionmentioning

confidence: 99%

Flow Characteristics of a Straight-Bladed Vertical Axis Wind Turbine with Inclined Pitch Axes

Guo

Lei

2020

Energies

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Currently, vertical axis wind turbines (VAWT) are considered as an alternative technology to horizontal axis wind turbines in specific wind conditions, such as offshore farms. However, complex unsteady wake structures of VAWTs exert a significant influence on performance of wind turbines and wind farms. In the present study, instantaneous flow fields around and downstream of an innovative VAWT with inclined pitch axes are simulated by an actuator line model. Unsteady flow characteristics around the wind turbine with variations of azimuthal angles are discussed. Several fluid parameters are then evaluated on horizontal and vertical planes under conditions of various fold angles and incline angles. Results show that the total estimated wind energy in the shadow of the wind turbine with an incline angle of 30° and 150° is 4.6% higher than that with an incline angle of 90°. In this way, appropriate arrangements of wind turbines with various incline angles have the potential to obtain more power output in a wind farm.

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Effect of chord-to-diameter ratio on vertical-axis wind turbine wake development

Cited by 18 publications

References 23 publications

Aerodynamically Interacting Vertical-Axis Wind Turbines: Performance Enhancement and Three-Dimensional Flow

Aerodynamically Interacting Vertical-Axis Wind Turbines: Performance Enhancement and Three-Dimensional Flow

Near-wake structure of full-scale vertical-axis wind turbines

Flow Characteristics of a Straight-Bladed Vertical Axis Wind Turbine with Inclined Pitch Axes

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