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Journal ArticleDOI

A modified Wells turbine for wave energy conversion

Toshiaki Setoguchi1, S. Santhakumar, Manabu Takao, T.H. Kim1, Kenji Kaneko1 
01 Jan 2003-Renewable Energy (Pergamon)-Vol. 28, Iss: 1, pp 79-91
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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Journal ArticleDOI
09 Jan 2018-Energies
TL;DR: In this article, a comparative analysis on FA and leading-adjustment (LA) in aerodynamic performance, including the adjusted angle of blades, total pressure, efficiency, system-efficiency, adjustment efficiency, and energy-saving rate, was carried out.
Abstract: The current paper mainly focuses on finding a more appropriate way to enhance the fan performance at off-design conditions. The centrifugal fan (CF) based on flap-adjustment (FA) has been investigated through theoretical, experimental, and finite element methods. To obtain a more predominant performance of CF from the different adjustments, we carried out a comparative analysis on FA and leading-adjustment (LA) in aerodynamic performances, which included the adjusted angle of blades, total pressure, efficiency, system-efficiency, adjustment-efficiency, and energy-saving rate. The contribution of this paper is the integrated performance curve of the CF. Finally, the results showed that the effects of FA and LA on economic performance and energy savings of the fan varied with the blade angles. Furthermore, FA was feasible, which is more sensitive than LA. Moreover, the CF with FA offered a more extended flow-range of high economic characteristic in comparison with LA. Finally, when the operation flow-range extends, energy-saving rate of the fan with FA would have improvement.

7 citations


Cites background from "A modified Wells turbine for wave e..."

  • ...How to improve its overall efficiency [2], total pressure [3], and energy utilization [4,5] should be significantly understood....

    [...]

Journal ArticleDOI
TL;DR: In this article, a submersible axial turbine is used to overcome the low performance and limited operating range of the conventional Wells turbine, and the turbine performance is demonstrated according to the flow coefficient, pressure coefficient, torque coefficient and turbine efficiency.

7 citations

Journal ArticleDOI
TL;DR: The purpose of the present work is to propose a new geometry, not focused on improving the rotor efficiency, but on reducing losses downstream of the rotor, based on the classical 2-D angle computations optimizing the flow and blade angles for both inflow and outflow modes.

6 citations

01 Sep 2013
TL;DR: Science Foundation Ireland (Charles Parsons Award at Hydraulics and Maritime Research Centre (HMRC) as mentioned in this paper, Ireland. But the winner of the Parsons Award was chosen by the authors of this paper.
Abstract: Science Foundation Ireland (Charles Parsons Award at Hydraulics and Maritime Research Centre (HMRC)).

6 citations


Additional excerpts

  • ...the pneumatic power into mechanical power, different design strategies for the power take-off have been proposed, but the most popular types of the pneumatic power conversion are the air turbines, such as the Wells turbine [21-23], impulse turbine [24-26], and the self-pitch controlled air turbine [27] et al....

    [...]

Proceedings ArticleDOI
01 Mar 2017
TL;DR: A model for Wells turbine is developed using Xilinx system generator (XSG) toolbox of Matlab and a PI control scheme is suggested for controlling the DC motor so as to emulate the Wells turbine efficiently.
Abstract: This paper develops a model for Wells turbine using Xilinx system generator (XSG)toolbox of Matlab. The Wells turbine is very popular in oscillating water column (OWC) wave energy converters. Mostly, the turbine behavior is emulated in a controlled DC or AC motor coupled with a generator. Therefore, it is required to model the OWC and Wells turbine in real time software like XSG. It generates the OWC turbine behavior in real time. Next, a PI control scheme is suggested for controlling the DC motor so as to emulate the Wells turbine efficiently. The overall performance of the system is tested with asquirrel cage induction generator (SCIG). The Pierson-Moskowitz and JONSWAP irregular wave models have been applied to validate the OWC model. Finally, the simulation results for Wells turbine and PI controller have beendiscussed.

6 citations


Cites background from "A modified Wells turbine for wave e..."

  • ...Most of the OWC plants are mounted with self-rectifying type turbines such as Wells turbine and impulse turbine [6-7]....

    [...]

References
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Journal ArticleDOI
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

Journal ArticleDOI
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