Experimental study of the mean wake of a tidal stream rotor in a shallow turbulent flow

Stallard, Tim; Tao, Feng; Stansby, Peter

doi:10.1016/j.jfluidstructs.2014.10.017

Cited by 101 publications

(59 citation statements)

References 19 publications

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“…This deficit is within the range of values measured in other experimental studies in the wake of a tidal turbine, along the wake centreline between 4 to 5D downstream of the rotor (Maganga et al, 2010;Rose et al, 2011;Stallard et al, 2015). A full recovery of the wake is not expected by 5D downstream.…”

Section: Overview Of Wake Characteristicssupporting

confidence: 80%

“…Near wake experimental studies also support identification of the beginning of the far wake region (i.e. a self-similar twodimensional wake) downstream of a device (Stallard et al, 2015).…”

Section: Introductionmentioning

confidence: 71%

“…Good et al, 2011;Rose et al, 2011;Stallard et al, 2015) or at small scale in the field (Birjandi et al, 2012;Sun, 2008). Porous discs have been used in small scale investigations to study the far wake characteristics of horizontal axis turbines on the assumption that the far wake characteristics are similar to a full scale rotor if the thrust on the rotor and channel properties are correctly scaled (Harrison et al, 2008;Myers and Bahaj, 2010).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Overview Of Wake Characteristicssupporting

confidence: 80%

“…Near wake experimental studies also support identification of the beginning of the far wake region (i.e. a self-similar twodimensional wake) downstream of a device (Stallard et al, 2015).…”

Section: Introductionmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%

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

2015

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“…These turbines will be referred to by the institute at which the experimental work has been carried out. Thus, we have the rotors designed by Cardiff University [6] and tested in the recirculating flume at Liverpool, which are reported in [7,8]; the IFREMER turbine, reported in [9]; and the Manchester turbine, reported in [10,11]. All rotors have a three-bladed configuration, and the blade geometries for each are shown in Figure 1.…”

Section: Bemtmentioning

confidence: 99%

“…Note that the IFREMER results have been corrected for blockage using the method of Glauert [2]. In order to apply this correction, the power and thrust coefficients must correspond to the same TSR values; the experimental values provided by Stallard et al [11] do not satisfy this condition, and thus, the correction cannot be carried out in this case. However, the blockage in this experiment was only 2.5% and, thus, would not greatly alter the results reported.…”

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confidence: 99%

A Comparison of Numerical Modelling Techniques for Tidal Stream Turbine Analysis

et al. 2015

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To fully understand the performance of tidal stream turbines for the development of ocean renewable energy, a range of computational models is required. We review and compare results from several models of horizontal axis turbines at different spatial scales. Models under review include blade element momentum theory (BEMT), blade element actuator disk, Reynolds averaged Navier Stokes (RANS) CFD (BEM-CFD), blade-resolved moving reference frame and coastal models based on the shallow water equations. To evaluate the BEMT, a comparison is made to experiments with three different rotors. We demonstrate that, apart from the near-field wake, there are similarities in the results between the BEM-CFD approach and a coastal area model using a simplified turbine fence at a headland case.

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Device Design

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Weller

Thies

et al. 2018

Wave and Tidal Energy

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Experimental study of the mean wake of a tidal stream rotor in a shallow turbulent flow

Cited by 101 publications

References 19 publications

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

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

A Comparison of Numerical Modelling Techniques for Tidal Stream Turbine Analysis

Device Design

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