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- Conference Paper:
Child and Venugopal
… A method is presented to analyse wave interactions with an array of simplified wave energy devices. The problem is formulated in terms of a group of heaving vertical circular cylinders floating in the ocean, whose motion is damped by their …
- Journal Article:
Draycott et al.
… energy sector has challenging requirements related to the physical simulation of the ocean environment for the purpose of evaluating energy generating technologies. In this paper the demands of the wave and tidal energy sectors are considered, with measurement and characterisation of the …
- Conference Paper:
Roberts et al.
… promising concepts which warrant further investigation. This paper focuses on the development of a model for assessing wave energy scenarios, combination of site, WEC and project specifications, on their commercial attractiveness. Quantitative evaluation is challenging due to the high degree of uncertainty at such an early development stage and the lack of design consensus within the …
- Journal Article:
Scarlett et al.
… blade can experience stall delay, load hysteresis and dynamic stall. Yet, the significance of these effects for a full-scale axial-flow turbine are unclear. To investigate, we develop a simple model for the unsteady hydrodynamics of the rotor and consider field measurements of the onset flow. We find that when the rotor operates in large, yet realistic wave conditions, …
- Journal Article: Noble et al.
Experimental Assessment of Flow, Performance, and Loads for Tidal Turbines in a Closely-Spaced Array
… array configurations where the downstream turbines are affected by the wake and/or bypass flow of upstream turbines. This work presents, for the first time, methods for and results from the physical testing of three 1/15 scale instrumented turbines configured in a closely-spaced staggered array, and … power extraction can be achieved through reduced array separation. A comprehensive set of flow measurements was taken during several weeks testing in the FloWave Ocean Energy Research … - Journal Article:
Chen et al.
… potential for local blockage effects and dynamic tuning strategies to enhance the performance of turbines in tidal channels. Full- and partial-width arrays of turbines, modelled using the volume-flux-constrained actuator disc and blade element momentum theories, are embedded within a two-dimensional channel with a naturally low ratio of drag to inertial forces. For steady flow, the local blockage effect observed by varying the …
- Conference Paper:
Dorward et al.
… with potential to make a significant contribution to our future energy needs. Development of the industry, from resource assessment to device design and operation, requires characterisation of the flow environment at a variety of spatial and temporal scales at tidal energy sites. Demand for flow characterisation arises …
- Journal Article:
Guy et al.
… for simulating tidal turbine non-steady hydrodynamic rotor load responses in the presence of turbulence, shear, and surface waves is developed. The model is validated using tank testing data from a lab-scale turbine. The validated model is then upscaled, to a power rating of 1.5 MW, and simulated in realistic wave–current conditions consistent with those of the MeyGen site. Mean torque and thrust are found to increase with turbine hub height, and the …
- Conference Paper:
Stallard et al.
… Although many marine energy technologies are presently being developed, only a small number of devices have generated electricity from the marine environment. From such a small experience base it is difficult to independently assess the economic feasibility of alternative technologies for large-scale electricity generation. With a few notable exceptions, much of the published work on marine energy costing concerns relatively small deployments (up to …
- Journal Article:
Radtke et al.
… the first detailed capacity value calculation for tidal barrage generation, based on modeling of operational modes for the proposed 8-GW Severn Barrage scheme in Great Britain. The key finding is that the effective load carrying capability is very low as a percentage of installed capacity (less than 10% for the example presented here). This is because of the high probability of having zero available output at time of peak demand, if peak demand …
- Journal Article:
Price et al.
… a commonly used performance indicator for a wave energy converter (WEC). The capture width of a linear WEC is shown to depend on two properties: the spectral power fraction (a property … on the sea state, and the monochromatic capture width, which is determined by the geometry of the WEC and the chosen power take off (PTO) coefficients. Each of these properties is examined in detail. Capture width is shown to be a measure of how well …
- Conference Paper:
Ewing et al.
… no published reliability data for Tidal Stream Turbines (TST’s). Thus, reliability assessments of failure critical components are highly uncertain. To reduce the Levelised cost of energy (LCoE) of TST technology it is critical to be able to perform accurate reliability assessments of …
- Conference Paper:
Stegman et al.
… This paper proposes a method that could be of use to developers when considering designs improvements, or to investors considering a range of opportunities. The methodology shows how improvements to designs can be developed using systematic problem solving tools and the Theory of Inventive Thinking (TRIZ). The methodology is demonstrated in this study, using high level …
- Conference Paper:
Bivol et al.
… PLAT-O #2 is a subsea floating tidal energy generator. A scaled-down physical model of this device was tested at FloWave in steady axial currents of up to 6.2 m/s (full-scale). The platform’s motion and mooring tensions were measured to … squat in an arc motion about the upstream lines to a stable lower depth, to balance the forces of drag, thrust, net buoyancy and lift. Hydrodynamic characteristics of the platform are derived …
- Conference Paper:
Mullings et al.
… Accurate assessment of the fatigue life of tidal stream turbines and components requires prediction of the unsteady loading of turbine components over a wide range of frequencies. This study …
- Journal Article:
Hassan et al.
… Erosion of tidal turbine blades in the marine environment is a major material challenge due to the high … can exhibit leading-blade edge erosion due to marine flows containing salt and solid particles of sand. Anti-erosion coatings can be used for more ductility at the blade surface, but the discontinuity between the coating and the stiffer composite can be a site of failure. Therefore, it is desirable to have a polymer matrix with a gradient of toughness, …
- Conference Paper:
Dooher et al.
… A great deal of energy can potentially be generated using underwater tidal current turbines. These operate in … is roughly 800 times denser than air can harvest more energy. Moreover, one major advantage of tidal current energy over other forms of renewable energy is that underwater currents and tides are predictable and the energy …
- Conference Paper:
Reynolds et al.
… A novel control strategy is proposed for the control of two fixed pitch tidal turbines subjected to discrete flow speeds whilst interconnected in an … Expenditure (OPEX) due to offshore equipment failure. An added benefit is utilisation of a single shared export cable for both turbines, thereby reducing Capital Expenditure (CAPEX). By lowering the cost of installing and maintaining an array it is anticipated that the commercial viability of the …
- Journal Article:
Draycott et al.
… The presence of waves exposes tidal stream turbines to large and cyclic hydrodynamic loads which significantly … field. The associated loads are found to be strongly correlated to the wavenumber. The nature of the rotational-sampling-effect is confirmed through analysis of the experimental results, where characteristic sidebands are effectively predicted in the …
- Journal Article:
Mueller and Baker
… stream devices, into electricity using direct drive electrical power take-off, without use of complex pneumatic, hydraulic or other mechanical linkages. In order to demonstrate the issues, two alternative topologies of linear electrical machines are investigated: the linear vernier hybrid permanent magnet … machine and the air-cored tubular permanent magnet machine. The electrical characteristics of these machines are described and compared in the context of mechanical integration. Potential …
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