Book ChapterDOI
8.05 – Air Turbines
A.F.O. Falcão,L.M.C. Gato +1 more
- Vol. 8, pp 111-149
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TLDR
In this paper, the authors presented the aerodynamic theory of axial-flow turbines and applied it to the Wells turbine and the impulse turbine, including their variants, in order to analyze their integration into the OWC wave energy converter.Abstract:
Air turbines are used to equip oscillating water column wave energy converters. In almost every case, self-rectifying turbines have been adopted which do not require non-return valves to rectify the reciprocating air flow induced by the water column oscillations. The most frequently used or proposed self-rectifying air turbines are the Wells turbine and the impulse turbine, both of axial-flow type. The fundamentals of the aerodynamic theory of axial-flow turbines are presented and then applied to the Wells turbine and the impulse turbine, including their variants. Information is given on methods of, and results from, air turbine model testing, as well as on self-rectifying air turbines that equipped or equip prototypes tested in the sea. The final part of the chapter is devoted to the analysis of turbine integration into OWC wave energy converter.read more
Citations
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Journal ArticleDOI
Wells turbine for wave energy conversion: a review
TL;DR: In this article, the authors provide an updated and a comprehensive account of the state of the art research on Wells turbine and draw a roadmap for the contemporary challenges which may hinder future reliance on such systems in the renewable energy sector.
Journal ArticleDOI
Design of oscillating-water-column wave energy converters with an application to self-powered sensor buoys
João C.C. Henriques,J.C.C. Portillo,Luís M.C. Gato,R.P.F. Gomes,Deisemara Ferreira,António F.O. Falcão +5 more
TL;DR: In this article, the authors present a new systematic methodology for optimum design of wave energy converters, which is applied to design two self-powered sensor buoys for long term monitoring based on the oscillating water column principle.
Journal ArticleDOI
Testing and control of a power take-off system for an oscillating-water-column wave energy converter
João C.C. Henriques,R.P.F. Gomes,Luís M.C. Gato,António F.O. Falcão,E. Robles,Salvador Ceballos +5 more
TL;DR: In this article, a power take-off control of an OWC (oscillating-water-column) spar-buoy wave energy converter was investigated. And the experimental results allowed the dynamic behaviour of the PTO to be characterized and provided validation of the proposed control algorithms that ensure operation within safe limits.
Journal ArticleDOI
Improved design of a Wells turbine for higher operating range
TL;DR: In this article, a numerical work relying on design optimization is reported to show the dependency of power extraction capability to the operating range of the turbine, and a surrogate approximation model was constructed to find an optimal design.
Journal ArticleDOI
Dynamics and control of air turbines in oscillating-water-column wave energy converters: Analyses and case study
TL;DR: In this article, a detailed analysis of the dynamics and control of air turbines and electrical generators in oscillating-water-columns (OWCs) is presented to explain the performance of an OWC device based on the physical behaviour of each system component.
References
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Journal ArticleDOI
Performance of the Islay Wells Air Turbine
TL;DR: A comparison of predicted and measured performance of the bi-directional Islay Wells air turbine is presented in this paper, where reasonable agreement was evident for pressure, converted power and efficiency, at lower flow rates for higher flow rates.
Journal Article
The Performance of Wells Turbine With 3D Guide Vanes
Journal ArticleDOI
Performance of the biplane wells turbine
Luís M.C. Gato,Richard Curran +1 more
TL;DR: In this article, the performance of the biplane turbine was investigated in unidirectional steady air flow by varying the model configurations using solidity, gap to chord ratio and stagger angle.
Tip Clearance Effect On the Flow Pattern of a Radial Impulse Turbine For Wave Energy Conversion
TL;DR: In this paper, three different tip clearance sizes have been simulated to compare the influence of the tip clearance size on the performance of a radial impulse turbine for wave energy conversion, and it was shown that changing the size of tip clearance from 0% to 4% of the blade span reduces the turbine maximum efficiency by up to 8%.
Journal ArticleDOI
Study of turbine with self-pitch-controlled blades for wave energy conversion
TL;DR: In this article, the authors clarified the performance of a Wells air turbine using self-pitch-controlled blades under real sea conditions and obtained the useful information about the optimum setting angle.