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

Atcheson, Mairéad; MacKinnon, Pauline; Elsaesser, Bjoern

doi:10.1016/j.oceaneng.2015.09.052

Cited by 26 publications

(5 citation statements)

References 24 publications

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“…Due to the orientation of the ADV and the fact that the in-axis flow component is correlated from two signals, the vertical velocity component is inherently less noisy than the horizontal components. This explains why the horizontal spectra flatten due to noise at lower frequency than the vertical spectrum [25], [26]. Although not directly comparable in magnitude, the ADV data shown in Fig.…”

Section: Overlapping Adv and Microrider Spectral Outputmentioning

confidence: 83%

Current and turbulence measurement with collocated ADP and turbulence profiler data

Torrens-Spence

Schmitt

MacKinnon

et al. 2015

2015 IEEE/OES Eleveth Current, Waves and Turbulence Measurement (CWTM)

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This paper presents a current and turbulence measurement campaign conducted at a test site in an energetic tidal channel known as Strangford Narrows, Northern Ireland. The data was collected as part of the MaRINET project funded by the EU under their FP7 framework. It was a collaborative effort between Queen's University Belfast, SCHOTTEL and Fraunhofer IWES. The site is highly turbulent with a strong shear flow. Longer term measurements of the flow regime were made using a bottom mounted Acoustic Doppler Profiler (ADP). During a specific turbulence measurement campaign, two collocated instruments were used to measure incoming flow characteristics: an ADP (Aquadopp, Nortek) and a turbulence profiler (MicroRider, Rockland Scientific International). The instruments recorded the same incoming flow, so that direct comparisons between the data can be made. In this study the methodology adopted to deploy the instruments is presented. The resulting turbulence measurements using the different types of instrumentation are compared and the usefulness of each instrument for the relevant range of applications is discussed. The paper shows the ranges of the frequency spectra obtained using the different instruments, with the combined measurements providing insight into the structure of the turbulence across a wide range of scales.978-1-4799-8419-0/15/$31.00 ©2015 IEEE

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Section: Overlapping Adv and Microrider Spectral Outputmentioning

confidence: 83%

Current and turbulence measurement with collocated ADP and turbulence profiler data

Torrens-Spence

Schmitt

MacKinnon

et al. 2015

2015 IEEE/OES Eleveth Current, Waves and Turbulence Measurement (CWTM)

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“…Further, the identified location by TSE index is tested by Ramos and Iglesias on two different types of turbines, ie, Gorlov helicoidal turbine and Evopod. Evopod is an axial‐flow horizontal‐axis turbine that operates under buoyant mooring arrangement as shown in Figure . Turbine efficiency, availability, capacity factor, and total energy output are the four parameters considered for comparison.…”

Section: Review On Hydrokinetic Potential Assessmentmentioning

confidence: 99%

“…Evopod is an axial-flow horizontal-axis turbine that operates under buoyant mooring arrangement as shown in Figure 6. 54 Turbine efficiency, availability, capacity factor, and total energy output are the four parameters considered for comparison. It was observed that although being an axial-flow turbine, Evopod has higher efficiency and thus generates higher output but has less availability and capacity factor than does Gorlov helicoidal turbine.…”

Section: Types Of Hydrokinetic Devicesmentioning

confidence: 99%

Development of hydrokinetic energy technology: A review

Sood

Singal

2019

Int J Energy Res

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Summary The drastic change in climatic conditions has led to shift towards the review of sustainable strategies in the renewable energy sector. Hydrokinetic technology has various benefits over the conventional methods, which can be helpful in achieving the desired sustainable development. In the present study, an outline for the conversion of hydrokinetic energy along with its challenges has been discussed. The study comprises of three steps involving collection of properties required for site characterization followed by selection of the suitable hydrokinetic device as per the site characteristics and the determination of impact on the flow condition due to device installation. The characteristics of the site govern the selection of the device, its mooring arrangements, and augmentation. The arrangement of devices as a single unit or in an array will have an impact on the flow conditions. The altered flow condition will in turn affect and change the characteristics of the site. This three‐step process is interlinked and will have a cumulative impact on the environment. The influence of environmental impact and cost of energy, which are the two major factors for the success of this technology, are also discussed. Further, various challenges faced by hydrokinetic technology in its development are explored. It is concluded that only the optimization of a hydrokinetic device for its efficiency improvement will not be fruitful until its impact on flow condition is considered for optimization.

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“…Deployment of tidal energy devices are planned to harness energy in the tidal channel of Ria Formosa, Portugal, although the same challenge is faced as the site is limited to a current velocity of 1.4 m/s. Initial deployment tests were performed showing underutilisation of the small-scale Evopod turbine [14,15], with a maximum output below 25% of the rated power output [16].…”

Section: Introductionmentioning

confidence: 99%

Design of a Horizontal Axis Tidal Turbine for Less Energetic Current Velocity Profiles

Encarnacion

Johnstone

Ordóñez-Sánchez

2019

JMSE

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Existing installations of tidal-stream turbines are undertaken in energetic sites with flow speeds greater than 2 m/s. Sites with lower velocities will produce far less power and may not be as economically viable when using "conventional" tidal turbine designs. However, designing turbines for these less energetic conditions may improve the global viability of tidal technology. Lower hydrodynamic loads are expected, allowing for cost reduction through downsizing and using cheaper materials. This work presents a design methodology for low-solidity high tip-speed ratio turbines aimed to operate at less energetic flows with velocities less than 1.5 m/s. Turbines operating under representative real-site conditions in Mexico and the Philippines are evaluated using a quasi-unsteady blade element momentum method. Blade geometry alterations are undertaken using a scaling factor applied to chord and twist distributions. A parametric filtering and multi-objective decision model is used to select the optimum design among the generated blade variations. It was found that the low-solidity high tip-speed ratio blades lead to a slight power drop of less than 8.5% when compared to the "conventional" blade geometries. Nonetheless, an increase in rotational speed, reaching a tip-speed ratio (TSR) of 7.75, combined with huge reduction in the torque requirement of as much as 30% paves the way for reduced costs from generator downsizing and simplified power take-off mechanisms.

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

Cited by 26 publications

References 24 publications

Current and turbulence measurement with collocated ADP and turbulence profiler data

Current and turbulence measurement with collocated ADP and turbulence profiler data

Development of hydrokinetic energy technology: A review

Design of a Horizontal Axis Tidal Turbine for Less Energetic Current Velocity Profiles

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