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- Michele et al.
A mathematical model is developed to analyse the hydrodynamics of a novel oscillating water column (OWC) in a hybrid wind-wave energy system. The OWC has a coaxial cylindrical structure in which the internal cylinder represents the mono-pile of an offshore wind turbine while the external cylinder has a skirt whose scope is to guide the wave energy flux inside the chamber. This…
- Moretti et al.
This paper presents a summary of recent progress towards the development and upscaling of an emerging class of electrostatic power take-off (PTO) systems for wave energy converters (WECs), called dielectric elastomer generators (DEGs). DEGs are electromechanical devices able to convert mechanical energy into electrical energy by exploiting the deformation of rubber-like dielectric materials.…
- Bull and Jacob
This paper outlines a methodology to derive the rigid body motions from Morison Equation forces for a floating Backward Bent Duct Buoy (BBDB). This Wave Energy Converter (WEC) is a particular style of Oscillating Water Column (OWC). The methodology details how to decompose the BBDB into a series of `hydrodynamic bodies' to account for inertial and viscous effects, `structural bodies' to…
- Smith et al.
This paper presents work completed by The Applied Research Laboratory at The Pennsylvania State University, in conjunction with Sandia National Labs, on the optimization of the power conversion chain (PCC) design to maximize the Average Annual Electric Power (AAEP) output of an Oscillating Water Column (OWC) device. The design consists of two independent stages. First, the design of a floating…
- Bull
A stochastic approach is used to gain a sophisticated understanding of a nonaxisymmetric floating oscillating water column’s response to random waves. A linear, frequency domain performance model that links the oscillating structure to air-pressure fluctuations with a Wells Turbine in 3-dimensions is used to study the device performance at a northern California deployment location. Both short-…
- Brusca et al.
The present paper deals with a preliminary study on an Oscillating Water Column Wave Energy Converter (OWCWEC). The energy conversion is based on a straight-bladed Darrieus type wind turbine. The design of the turbine for maximum power coefficient is discussed.
A physical laboratory scale OWC wave energy converter model was built to measure velocity field in…
- Elhanafi
This research was performed with a focus on two key aspects of energy cost–reduction for offshore OWC devices; improving the power extraction efficiency and reducing the excess margin in structural safety factors by a better understanding of wave–induced loads on these devices. This study utilised information from three different resources. First, 2D and 3D numerical results from fully…
- Singh et al.
To investigate the dynamic response of a floating moored oscillating water column device under realistic sea states, a focused wave technique was developed in this study to generate user-defined wave trains in a wave basin equipped with a piston-type wavemaker. The experimental setup allowed for simultaneous measurements of the designed focused wave trains, internal chamber wave elevations and…
- Liu et al.
Oscillating water column (OWC) wave energy converters (WECs) have two energy conversion stages. In this study, an axial-flow impulse turbine was installed on an OWC model to replace the traditional substitute, such as the orifice plate. The OWC model was placed in a wave flume for the experimental tests under regular wave conditions. This experimental setup was expected to reflect more actual…
- Duckers
The Clam is an offshore toroidal structure housing 12 air cells which are sealed from the sea by means of reinforced rubber membranes. For the desirable membrane lifetime of between five and ten years to be realised there are a number of conditions which must be met, including large vertical strength together with horizontal elasticity which permits flexibility without buckles and kinks. To…
- Mauro et al.
The idea of investigating the fluid dynamic behavior of a ducted Savonius wind turbine derives from the research about the improvements of Oscillating Water Column Wave Energy Converters in which the air is forced to flow back and forth inside a duct. The Savonius rotors appeared to be very suitable for this kind of applications for many reasons. Indeed, these rotors are very simple to built,…
- Dai et al.
This paper presents a study of the effect of model scale on the performance of a fixed Oscillating Water Column (OWC) type Wave Energy Converter (WEC). Tank tests at two different scales, including the effect of scaling of the test tanks to minimise the bias introduced by different wave blockage effects. CFD simulations based on Reynolds Average Navier Stokes (RANS) method were then carried…
- Ashlin et al.
Wave energy is a renewable energy source that has an immense potential for exploitation as clean energy. Studies on the oscillating water column (OWC) widely pertain to the optimization of its geometries to enhance the wave power absorption; comparatively, the wave-induced loadings on such structures have received lesser attention. Hence, in this study, a detailed experimental investigation…
- Anbarsooz et al.
One of the main geometrical parameters of the fixed oscillating water column wave energy converters is the inclination angle of front wall. In this study, the effects of this parameter on the hydrodynamic performance of an oscillating water column is investigated using a fully nonlinear two-dimensional numerical wave tank, which is developed using the Ansys Fluent 15.0 commercial software. The…
- Wilbert et al.
The principle of oscillating water column within a chamber due to the propagating oscillatory ocean waves being converted into clean energy through wave energy convertor referred to as Oscillating water column (OWC) device is a well proven concept that still remains as one of the most promising alternate sources of energy from the Ocean. The OWC has single column of water oscillation, whereas…
- Setoguchi et al.
Bidirectional flow air turbines are used in association with oscillating water columns to convert wave energy available in the oceans into mechanical power. Radial turbines, among others, were studied for such an application. The efficiency of radial turbines using reaction blading was found to be extremely low. On the other hand, the efficiency of impulse-type radial turbines was found to be…
- Curran et al.
The matching of a Wells air turbine to an oscillating water column (OWC) is addressed, with particular reference to design synthesis at the Islay prototype wave power converter. The level of damping applied by the turbine must optimize the hydraulic performance of the OWC in order to facilitate efficient conversion from wave power to pneumatic power. Furthermore, a Wells turbine is only able…
- Park et al.
This paper presents a parametric study on oscillating water column (OWC) wave energy converter (WEC). The OWC is being planned to be placed on a breakwater in isolated islands remote from the land. Both of numerical analysis and model experiment were utilized for deciding a proper conceptual design that covers the purpose. Various design parameters including configurations and dimensions were…
- Jin et al.
In an oscillating water column (OWC)-type wave energy conversion system, the performance of the OWC chamber depends on the chamber shape, as well as the incident wave direction and pressure drop produced by the turbine. Although the previous studies on OWC chambers have focused on wave absorbing performance in ideal operating conditions, incident waves do not always arrive normally to the OWC…
- Fonseca and Pessoa
The paper presents a concept of a wave energy converter and the numerical model to calculate the hydrodynamic responses in waves and the power produced by the power take off system. The system consists of an asymmetric floater with an interior U-tank partially filled with water and two lateral air chambers connected by a duct. The motion of the U-shaped oscillating water column…
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