A modified Wells turbine for wave energy conversion
TL;DR: In this paper, the rotor blade pitch was set asymmetrically at a positive pitch to achieve a higher mean efficiency in a wave cycle and the performance characteristics of a turbine with different blade setting angles in steady flow were found by experimentation.
About: This article is published in Renewable Energy.The article was published on 2003-01-01. It has received 84 citations till now. The article focuses on the topics: Oscillating Water Column & Wells turbine.
Citations
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04 Jul 2013
TL;DR: In this paper, a recomendacao teorica a respeito de qual perfil aerodinâmico pode ser empregado for rotores de pequenos dispositivos de conversao de energia das ondas do mar em energia eletrica.
Abstract: O presente trabalho apresenta um estudo teorico a respeito da influencia de diversos perfis aerodinâmicos (NACA0012, NACA0015, NACA0018, NACA0020 e NACA0021) sobre a potencia e torque gerados em uma turbina Wells. Em todos os casos avaliados, o rotor possui um raio da turbina rt = 245 mm e uma razao de aspecto de AR = 0.7. O objetivo principal e obter uma recomendacao teorica a respeito de qual perfil aerodinâmico pode ser empregado para os rotores de pequenos dispositivos de conversao de energia das ondas do mar em energia eletrica, mais especificamente coluna de agua oscilante com potencias inferiores a 1 kW. Para realizar a estimativa da potencia e torque foram utilizadas recomendacoes teorico-experimentais da literatura. Os resultados indicaram que o melhor perfil aerodinâmico (NACA0021) e capaz de conduzir a uma potencia mecânica de aproximadamente 319 W, apresentando um desempenho 36 % superior ao perfil NACA0020, que conduziu aos piores resultados.
3 citations
TL;DR: In this paper, a self-rectifying turbine for reciprocating flows is proposed, which has a rotor with fan blades set on the hub by a pivot equipped near the leading edge and is free to oscillate between two preset angles determined by mechanical stops.
3 citations
01 Jan 2017
TL;DR: In this article, numerical modeling of wave energy converters (WECs) of the wave activated body type (WAB) is based on Newton's second law, which states that the inertial force is balanced by all forces acting on the WEC's captor.
Abstract: Numerical modelling of wave energy converters (WECs) of the wave activated body type (WAB, see Chap. 2) is based on Newton’s second law, which states that the inertial force is balanced by all forces acting on the WEC’s captor.
3 citations
Cites methods from "A modified Wells turbine for wave e..."
...Nevertheless, there are other alternatives such as Wells turbines with variable-pitch angle blades [34] and axial [35] or radial [36] impulse turbines....
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01 Jan 2012
TL;DR: In this article, the authors present distintas tecnologias for extraer energia renovable a partir de las olas del mar, in particular the oscillating water column (OWC).
Abstract: Las energias renovables ayudaran a alcanzar importantes objetivos economicos,
ambientales y sociales en las primeras decadas del siglo XXI. En este articulo se presentan
distintas tecnologias para extraer energia renovable a partir de las olas del mar. En particular se describe la tecnologia OWC (Oscillating Water Column), explicando su funcionamiento,
estructura, las problematicas que plantea y propuestas de estrategias de control para solucionarlas.
3 citations
21 Aug 2009
TL;DR: In this article, the authors proposed a wave energy source that has a potential world-wide contribution to the electricity market estimated in the order of 2,000 TWh/year, which represents about 10% of the world's electricity consumption with an investment cost of EUR 820 billion.
Abstract: Wave energy is a renewable and pollution-free energy source that has a potential world-wide contribution to the electricity market estimated in the order of 2,000 TWh/year, which represents about 10% of the world’s electricity consumption with an investment cost of EUR 820 billion. Sea waves have one of the highest energy densities among the Renewable Energy Sources (RES). Today, the largest problem in harvesting wave energy is obtaining reliability of the technology and bringing the cost down.
3 citations
References
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TL;DR: In this article, the performance of a single plane biplane Wells turbine with or without guide vanes is compared with a wave energy device based on the principle of the oscillating water-air column.
286 citations
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.
109 citations
01 Jan 2002
TL;DR: The Mighty Whale is a floating wave power device based on the Oscillating Water Column (OWC) principle, which converts wave energy into electric energy, and produces a relatively calm sea area behind.
Abstract: Mighty Whale is a floating wave power device based on the Oscillating Water Column (OWC) principle. It converts wave energy into electric energy, and produces a relatively calm sea area behind. The open sea tests were begun in September 1998 in Gokasho Bay, Nansei Town, Mie Prefecture. Measurements collected since then include performance data in typhoon seasons. This paper presents the measurements of wave energy absorption, floating body motion, and wave height dissipation. It is expected that these results will be useful in the design of offshore wave power devices in the future.
78 citations
01 Jan 2000
TL;DR: The Mighty Whale as mentioned in this paper was used for open sea tests to investigate the use of wave energy for power generation in Mie Prefecture, Japan, and the results of the tests were summarized in a recent paper.
Abstract: JAMSTEC completed the construction of the prototype device Mighty Whale by May 1998 for open sea tests to investigate practical use of wave energy. Following construction, the prototype was towed to the test location near the mouth of Gokasho Bay in Mie Prefecture. The open sea tests were begun in September 1998, after final positioning and mooring operations were completed. The tests are expected to continue for approximately 2 years. This paper presents an overview of the open sea tests, and summarizes the characteristics of power generation based on the results so far.
59 citations
Journal Article•
TL;DR: In this paper, the performance of the impulse turbine with fixed guide vanes was compared with that of the Wells turbine with a fixed guide vane, and it was shown that the running and starting characteristics of the latter were superior to those of the former under irregular wave conditions.
Abstract: The objective of this paper is to clarify the performance of impulse turbine with fixed guide vanes and to compare it with that of Wells turbine with guide vanes. As a result, a suitable choice of the design factors for the impulse turbine was shown for the inlet angle of rotor blade and the shape of guide vane. Furthermore, it was found that the running and starting characteristics of the impulse turbine were superior to those of the Wells turbine under irregular wave condition.
56 citations