Journal ArticleDOI
Wave generation by an oscillating surface-pressure and its application in wave-energy extraction
TLDR
In this paper, a two-dimensional analysis based on linear surface-wave theory is developed for an oscillating-water-column wave-energy device in water of arbitrary constant depth, and the results show that air compressibility can be important in practice, and its effects may in general be satisfactorily represented by linearization.Abstract:
A two-dimensional analysis, based on linear surface-wave theory, is developed for an oscillating-water-column wave-energy device in water of arbitrary constant depth. The immersed part of the structure is assumed of shallow draught except for a submerged vertical reflecting wall. Both the cases of linear and nonlinear power take-off are considered. The results show that air compressibility can be important in practice, and its effects may in general be satisfactorily represented by linearization. The analysis indicates that using a turbine whose characteristic exhibits a phase difference between pressure and flow rate may be a method of strongly reducing the chamber length and turbine size with little change in the capability of energy extraction from regular waves. It was found in two examples of devices with strongly nonlinear power take-off that the maximum efficiency is only marginally inferior to what can be achieved in the linear case.read more
Citations
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Journal ArticleDOI
Nonlinear hydrodynamic and real fluid effects on wave energy converters
Hugh Wolgamot,C. J. Fitzgerald +1 more
TL;DR: In this article, the fundamental principles of wave energy extraction and converter modelling have been studied and great advances in the understanding of fundamental principles have been made in the field of ocean wave energy.
Journal ArticleDOI
Experimental investigation on the hydrodynamic performance of a cylindrical dual-chamber Oscillating Water Column device
TL;DR: In this paper, the hydrodynamic performance of a dual-chamber Oscillating Water Column (OWC) wave energy device was experimentally studied to assess conversion efficiency.
Book ChapterDOI
The Theory Behind the Conversion of Ocean Wave Energy: a Review
TL;DR: An attempt is made to provide an explanation as to these results were obtained, how they may be employed in a beneficial sense and the importance of designing a device to match the wave climate.
Journal ArticleDOI
Hydrodynamic principles of wave power extraction
TL;DR: The hydrodynamic principles common to many wave power converters are reviewed via two representative systems and a simple theory is given for a two-dimensional array of small buoys in well-separated rows parallel to a coast.
Journal ArticleDOI
Wave energy extraction by an oscillating water column with a gap on the fully submerged front wall
Utku Şentürk,Aydoğan Özdamar +1 more
TL;DR: In this article, the theoretical analysis of an alternative oscillating water column type wave energy converter is presented, where the problem geometry differs from earlier two dimensional studies by a modification on the front wall where the surface piercing barrier is replaced with a fully submerged barrier with a gap.
References
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Surface Waves
TL;DR: In this paper, the evanescent field structure over the wave front, as represented by equiphase planes, is identified as one of the most important and easily recognizable forms of surface wave.
Journal ArticleDOI
Wave-power absorption by systems of oscillating surface pressure distributions
TL;DR: In this article, the efficiency of energy absorption of a system of uniform oscillatory surface pressure distributions was derived based on linear water-wave theory and the results showed the close analogies which exist with theories for absorbing oscillatory rigid bodies and a number of new reciprocal relations for pressure distributions.
Journal ArticleDOI
On the Theory of the Wells Turbine
Luís M.C. Gato,A.F. de O. Falcão +1 more
TL;DR: In this article, the authors present an etude theorique du comportement thermodynamique de la turbine de Wells, a turbine a ecoulement axial adaptee a l'extraction d'energie a partir d'un energy alternatif, and obtention d'expressions for la forme d'ailette rendant maximal le rendement of the turbine.
Book ChapterDOI
Computer oriented algorithms for solving systems of simultaneous nonlinear algebraic equations
TL;DR: In this paper, the authors discuss the problem of solving N real equations in N real unknowns, and present the best algorithms for the various facets of the given system, such as getting into a region of local convergence from poor initial estimates, achieving guaranteed convergence to a root from anywhere within a specified region by suitably restricting the functions fi, using a technique in a vicinity of a root (local technique) which is fast, stable and which does not require the user to furnish derivatives of the function fi; and finally, obtaining additional roots of a nonlinear system without converging again to
Related Papers (5)
Hydrodynamic characteristics of an oscillating water column device
D. V. Evans,Richard Porter +1 more