Tidal Energy Round Robin Tests: A Comparison of Flow Measurements and Turbine Loading

Martínez, Rodrigo; Gaurier, Benoît; Ordóñez-Sánchez, Stephanie; Facq, Jean-Valéry; Germain, Grégory; Johnstone, Cameron; Santic, Ivan; Salvatore, Francesco; Davey, Thomas; Old, Chris; Sellar, Brian

doi:10.3390/jmse9040425

Cited by 12 publications

(7 citation statements)

References 27 publications

(51 reference statements)

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“…For example, a 10% difference in the flow velocity between facilities can generate differences in the turbine performance coefficients of up to 25%. A detailed analysis of the tests and facilities can be found in [53,71].…”

Section: Testing Procedures and Preliminary Findingsmentioning

confidence: 99%

Standardising Marine Renewable Energy Testing: Gap Analysis and Recommendations for Development of Standards

Noble

O’Shea

Judge

et al. 2021

JMSE

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Marine renewable energy (MRE) is still an emerging technology. As such, there is still a lack of mature standards and guidance for the development and testing of these devices. The sector covers a wide range of disciplines, so there is a need for more comprehensive guidance to cover these. This paper builds on a study undertaken in the MaRINET2 project to summarise recommendations and guidance for testing MRE devices and components, by reviewing the recently published guidance. Perceived gaps in the guidance are then discussed, expanding on the previous study. Results from an industry survey are also used to help quantify and validate these gaps. The main themes identified can be summarised as: the development progression from concept to commercialisation, including more complex environmental conditions in testing, accurately modelling and quantifying the power generated, including grid integration, plus modelling and testing of novel moorings and foundation solutions. A pathway to a standardised approach to MRE testing is presented, building on recommendations learnt from the MaRINET2 round-robin testing, showing how these recommendations are being incorporated into the guidance and ultimately feeding into the development of international standards for the marine renewable energy sector.

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Section: Testing Procedures and Preliminary Findingsmentioning

confidence: 99%

Standardising Marine Renewable Energy Testing: Gap Analysis and Recommendations for Development of Standards

Noble

O’Shea

Judge

et al. 2021

JMSE

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“…An electrical motor was connected to the hinge to generate a resisting torque to represent the power takeoff. The control law was a simple proportional law, given by Equation (1). All symbols and units are described in Table 2.…”

Section: Power Takeoffmentioning

confidence: 99%

“…As part of this process, a number of "round robin" testing programmes were conducted where nonproprietary wave, floating wind and tidal devices were tested in different infrastructures to assess the influence the facility and local test practices had on the experimental results. This project's predecessor, the EU FP7 MaRINET project, conducted a tidal round robin programme [1], but attempts to gain meaningful wave data were unsuccessful.…”

Section: Introductionmentioning

confidence: 99%

Round Robin Testing: Exploring Experimental Uncertainties through a Multifacility Comparison of a Hinged Raft Wave Energy Converter

Davey

Sarmiento

Ohana

et al. 2021

JMSE

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The EU H2020 MaRINET2 project has a goal to improve the quality, robustness and accuracy of physical modelling and associated testing practices for the offshore renewable energy sector. To support this aim, a round robin scale physical modelling test programme was conducted to deploy a common wave energy converter at four wave basins operated by MaRINET2 partners. Test campaigns were conducted at each facility to a common specification and test matrix, providing the unique opportunity for intercomparison between facilities and working practices. A nonproprietary hinged raft, with a nominal scale of 1:25, was tested under a set of 12 irregular sea states. This allowed for an assessment of power output, hinge angles, mooring loads, and six-degree-of-freedom motions. The key outcome to be concluded from the results is that the facilities performed consistently, with the majority of variation linked to differences in sea state calibration. A variation of 5–10 % in mean power was typical and was consistent with the variability observed in the measured significant wave heights. The tank depth (which varied from 2–5 m) showed remarkably little influence on the results, although it is noted that these tests used an aerial mooring system with the geometry unaffected by the tank depth. Similar good agreement was seen in the heave, surge, pitch and hinge angle responses. In order to maintain and improve the consistency across laboratories, we make recommendations on characterising and calibrating the tank environment and stress the importance of the device–facility physical interface (the aerial mooring in this case).

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“…Furthermore, the relative effect of the wave was slightly smaller in both the rotor and BRBM quantities in comparison with the low frequency energy developed due to the turbulent flow fluctuations associated with larger turbulent flow structures. The observed relative contributions of low frequency turbulent energy and wave energy to the loading transients will clearly differ depending on the parameters of the turbulence and the waves being considered [41].…”

Section: Power Spectral Densitymentioning

confidence: 99%

A Phenomenological Study of Lab-Scale Tidal Turbine Loading under Combined Irregular Wave and Shear Flow Conditions

Allmark

Martínez

Ordóñez-Sánchez

et al. 2021

JMSE

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Tidal devices are likely to faced with shear flows and subjected to various wave climates. The paper presents an experimental study of the combined impacts of shear profile and irregular waves on the loading of a 1/20th scale device operating at peak power extraction. The experiments presented were conducted at various depths to facilitate analysis of the effects of the shear flow and wave impact on the device at various positions in the water column. The fluid field was measured at three different upstream positions and at three depths (top, middle and bottom of the rotor) for each experiment; in doing so, data from the device were captured three times. The fluid measurements were of a high quality and were analysed to present the structure flow upstream of the device, which contained velocity and turbulence profiles. The upstream measurement was utilised to understand the development of flow structures in the approach to the device, and the impact of the flow structures measured was confirmed via cross-covariance calculations. The long datasets gathered were used to produce full rotational probability density functions for the blade-root-bending moments for three blades. The spectral characteristics were also considered, and showed that rotor loading quantities are less reactive to smaller scale flow structures.

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Tidal Energy Round Robin Tests: A Comparison of Flow Measurements and Turbine Loading

Cited by 12 publications

References 27 publications

Standardising Marine Renewable Energy Testing: Gap Analysis and Recommendations for Development of Standards

Standardising Marine Renewable Energy Testing: Gap Analysis and Recommendations for Development of Standards

Round Robin Testing: Exploring Experimental Uncertainties through a Multifacility Comparison of a Hinged Raft Wave Energy Converter

A Phenomenological Study of Lab-Scale Tidal Turbine Loading under Combined Irregular Wave and Shear Flow Conditions

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