Tidal Energy Update 2009

O'Rourke, Fergal; Boyle, Fergal; Reynolds, Anthony P.

doi:10.4324/9781315793245-112

Cited by 14 publications

(14 citation statements)

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“…Despite the potential, the industry has not prospered as rapidly as had been predicted. This outcome has been deemed to be due to engineering challenges within extreme operating conditions, in combination with political and environmental factors [2]. Despite the drawbacks observed within the tidal industry, European, North American, and Asian states have largely invested in the deployment of full-scale tidal turbine arrays.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Swallowing-Capacity Analysis of a Vacant, Cylindrical, Bi-Directional Tidal Turbine Duct in Aligned & Yawed Flow Conditions

Borg

Xiao

Allsop

et al. 2021

JMSE

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Introducing a duct along the perimeter of a rotor has been acknowledged to augment turbine performance. The outcome causation due to a bi-directional, cylindrical shroud, however, is uncertain. This study analyses the hydrodynamic swallowing capacity of a true-scale, vacant duct for tidal turbine applications in aligned and yawed inlet flow conditions by utilising three-dimensional unsteady computational fluid dynamics. The performance is investigated within free-stream magnitudes of 1 to 7 m.s−1, and a bearing angular range of 0° to 45° with the duct axis. In proportion to the free-stream magnitude, the normalised axial velocity through the duct increases as a result of a diminishment in pressure drag. Within yawed flow, the maximum capacity falls at a bearing of 23.2°, resulting in a performance increase of 4.13% above that at aligned flow conditions. The analysis concludes that the augmentation at yawed flow occurs due to the duct cross-sectional profile lift variation with angle-of-attack. Towards nominal yaw angle, the internal static pressure reduces, permitting a higher mass-flow rate. Beyond the nominal angle-of-attack, flow separation occurs within the duct, increasing pressure drag, thereby reducing the swallowing capacity.

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Section: Introductionmentioning

confidence: 99%

A Numerical Swallowing-Capacity Analysis of a Vacant, Cylindrical, Bi-Directional Tidal Turbine Duct in Aligned & Yawed Flow Conditions

Borg

Xiao

Allsop

et al. 2021

JMSE

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“…Some variations of tidal stream turbines with 16–18 m diameter, rated over 1 MW: (a) ALSTOM tidal stream turbines (http://www.alstom.com/products-services/product-catalogue/power-generation/renewable-energy/ocean-energy/tidal-energy/tidal-power/, dated 18 October 2015), (b) NEPTUNE Stream Device of Acquamarine 2.4 MW (Rourke et al, 2010), and (c) DCNS-OPENHYDRO 2 MW 16 m diameter rim type turbine (http://www.edf.com/html/biodiversite2011/uk/concilier/paimpol.html). …”

Section: Tidal Power Plantsmentioning

confidence: 99%

Reassessment of tidal energy potential in India and a decision-making tool for tidal energy technology selection

Murali

Sundar

2017

The International Journal of Ocean and Climate Systems

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Oceans have significant renewable energy options to provide environmental friendly and clean energy. Technology for ocean energy systems and the feasibility for extraction of the same is an important area on which research is being focused worldwide. This article covers a detailed review of available tidal energy conversion technologies and case studies, with specific focus on tidal power potential in India. The proven option for tidal energy conversion is barraging. Recently, open-type turbine (usually known as tidal stream turbines) has been studied by several researchers and pilot demonstrations have been made. While conventional turbines of 10-20 MW rating are used in barrages, the application of tidal stream turbines of 0.5-2.0 MW has been demonstrated in water depths between 40 and 60 m. A new scale is proposed for categorizing the tidal energy potential in terms of tidal velocity and tidal range which could be used to categorize the potential sites and their ranking. A new systematic approach proposed for the assessment of tidal energy conversion potential can facilitate the suitability of either tidal stream energy or tidal barrage for a location. Within this, one could also decide the site could be developed as a major project or minor project. Therefore, the present work will be useful for engineers and decision makers in technology selection investment potential identification.

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“…With good predictability and high energy density, tidal current energy has received wide attention. 1 Its CO 2 and energy payback and exhibited CO 2 intensity also compares favorably against other energy sources. 2 Tidal current turbines are the machines that extract energy from tidal current, and their principle is similar to wind turbines’.…”

Section: Introductionmentioning

confidence: 97%

Research on the end-plate for vertical axis tidal current turbine

Xie

Kang

Chen

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part M:

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Tidal current energy is one of the competitive alternative energy resources. Vertical axis turbine is the technology to extract energy from tidal current with some unique advantages. As the energy efficiency of vertical axis turbine is still relatively low, a blade tip device named end-plate is studied to improve the turbine's performance. The end-plate was intended to block the fluid from flowing across the tip and the shape of the end-plate was designed according to the influence area of the tip flow. The comparison of the turbine with and without end-plates was made by numerical and experimental methods. Good agreement was achieved, and the result showed that adding end-plates on the tip of the blade could increase the turbine's output power. On the basis of the former study, two kinds of end-plate enhancement were presented as inward-half end-plates and outward-half end-plates. The numerical research showed that both inward-half end-plates and outward-half end-plates had better output than the original end-plates. The numerical results also indicated that the blade with outward-half end-plates had the minimum amplitude of the torque over one rotational cycle among the three kinds of end-plates, while the blade with inward-half end-plates had the maximum amplitude of the torque. To obtain better power output and prolong the service life of turbine, the outward-half end-plate is recommended.

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Tidal Energy Update 2009

Cited by 14 publications

References 0 publications

A Numerical Swallowing-Capacity Analysis of a Vacant, Cylindrical, Bi-Directional Tidal Turbine Duct in Aligned & Yawed Flow Conditions

A Numerical Swallowing-Capacity Analysis of a Vacant, Cylindrical, Bi-Directional Tidal Turbine Duct in Aligned & Yawed Flow Conditions

Reassessment of tidal energy potential in India and a decision-making tool for tidal energy technology selection

Research on the end-plate for vertical axis tidal current turbine

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