Analysis of Wells turbine design parameters by numerical simulation of the OWC performance
TL;DR: In this article, the authors investigated the influence of the turbine aerodynamic design on the overall plant performance, as affected by the turbine peak efficiency and the range of flow rates within which the turbine can operate efficiently.
About: This article is published in Ocean Engineering.The article was published on 2002-09-01. It has received 109 citations till now. The article focuses on the topics: Wells turbine & Oscillating Water Column.
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TL;DR: In this article, a comprehensive classification of the synergies between offshore wind and wave energy, the different options for combining wave and offshore wind energy, and the technological aspects is presented.
Abstract: The sustainable development of the offshore wind and wave energy sectors requires optimising the exploitation of the resources, and it is in relation to this and the shared challenge for both industries to reduce their costs that the option of integrating offshore wind and wave energy arose during the past decade. The relevant aspects of this integration are addressed in this work: the synergies between offshore wind and wave energy, the different options for combining wave and offshore wind energy, and the technological aspects. Because of the novelty of combined wave and offshore wind systems, a comprehensive classification was lacking. This is presented in this work based on the degree of integration between the technologies, and the type of substructure. This classification forms the basis for the review of the different concepts. This review is complemented with specific sections on the state of the art of two particularly challenging aspects, namely the substructures and the wave energy conversion.
407 citations
Cites background from "Analysis of Wells turbine design pa..."
...reversing stream of high-velocity air, which is channelled through a turbine-generator group to produce electricity [90, 91]....
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11 Dec 2006
TL;DR: In this article, the point absorber and oscillating water column WEC devices are addressed with regards to commercial prospects, environmental concerns, current state-of-the-art, and further research areas.
Abstract: Ocean energy conversion has been of interest for many years. Recent developments such as concern over global warming have renewed interest in the topic. This paper gives a systematic and comprehensive overview of wave energy converters (WEC) as opposed to ocean current energy converters. The point absorber and oscillating water column WEC devices are addressed with regards to commercial prospects, environmental concerns, current state-of-the art, and further research areas. Thereby, the paper seeks to enhance investigation of results obtained in other fields in the ocean wave energy conversion setting and to stimulate research on topics that have not been in the focus so far.
179 citations
TL;DR: A survey of wave energy converters can be found in this paper, where the most important criteria that have to be kept in mind when designing a WEC are described and evaluated.
Abstract: The utilization of renewable energy sources is a vital aspect for development of sustainability. Currently, an unexploited energy source is ocean waves. Various types of wave energy converters (WECs) are able to transform the motion of the waves into electricity. During the last 30 years, a wide range of prototypes was presented with different rates of success. The aim of this survey is to give an overview of how WECs are categorized [operation principle and power takeoff (PTO) system] and show what are the most important criteria that have to be kept in mind when designing a WEC. A few important WECs are described and evaluated.
159 citations
TL;DR: In this paper, a time-domain numerical simulator of oscillating water column (OWC) wave power plants is presented, where the simulation of the movements of the inner free surface due to the excitation of the outer sea-waves is split into two subproblems: an outer one dealing with the incident, diffracted and radiated waves, solved once for all, and an inner one, concerning the inner water volume behavior.
122 citations
TL;DR: In this paper, the numerical analyses are carried out using Fluinco model that deals with incompressible flow problems based on the Navier-Stokes equations and employs the two-step semi-implicit Taylor-Galerkin method.
121 citations
Cites background from "Analysis of Wells turbine design pa..."
...Therefore, in this case, the turbine characteristic relation (kt) is assumed constant [50,51]....
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References
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01 Oct 1962
TL;DR: In this article, two new representations of the usual equations of motion for an oscillating ship are given, one makes use of the impulse response function and depends only upon the system being linear.
Abstract: : After a review of the deficiencies of the usual equations of motion for an oscillating ship, two new representations are given. One makes use of the impulse response function and depends only upon the system being linear. The response is given as a convolution integral over th past history of the exciting force with the impulse response funcion appearing as the kernel. The second representation is based upon a hydrodynamic study, and new forms for the equations of motion are exhibited. The equations resemble the usual equations, with the addition of convolution integrals over the past history of the velocity. However, the coefficients in these new equations are independent of frequency, as are the kernel functions in the convolution integrals. Both representations are quite general and apply to transient motions as well as periodic. The relations between the two representations are given. The treatment considers six degrees of freedom, with linear coupling between the various modes. (Author)
1,399 citations
316 citations
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01 Jan 1970
TL;DR: Applied mathematics for engineers and physicists as mentioned in this paper, applied mathematics for scientists and engineers, applied mathematics and physics for engineers, and applied mathematics in the field of computer science and engineering, etc.
Abstract: Applied mathematics for engineers and physicists , Applied mathematics for engineers and physicists , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
295 citations
TL;DR: 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.
286 citations