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Proceedings ArticleDOI

Effect of Guide Vane Angle on Wells Turbine Performance

15 Dec 2014-

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Citations
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Journal ArticleDOI

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TL;DR: In this article, the effects of the gap between rotor and guide vane and the solidity of the guide vanes on the performance of a Wells turbine have been investigated by model testing.
Abstract: In order to improve the performance of a Wells turbine, the effects of the gap between rotor and guide vane and solidity of the guide vane have been investigated by model testing. The results have been compared with those of the case without guide vanes. It is found that the overall characteristics of the turbine are considerably improved by the guide vanes. Furthermore, a suitable choice of design parameters such as the gap and the solidity of the guide vane has been suggested.

34 citations

Journal ArticleDOI

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TL;DR: In this paper, an oscillating water column wave energy harvesting system uses pneumatic power to run a turbine and generate power, both reaction (mainly Wells turbine) and impulse type turbines are tested in oscilla.
Abstract: Oscillating water column wave energy harvesting system uses pneumatic power to run a turbine and generate power. Both reaction (mainly Wells turbine) and impulse type turbines are tested in oscilla...

17 citations


Cites background from "Effect of Guide Vane Angle on Wells..."

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Journal ArticleDOI

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TL;DR: In this paper, a concept of different orientations of GVs in between a two-row biplane wells turbine (BWT) was introduced and analyzed for the performance improvement, and the fluid flow was simulated numerically with a commercial software ANSYS CFX 16.1.
Abstract: Guide vanes (GVs) improve the performance of a turbine in terms of efficiency, torque, or operating range. In this work, a concept of different orientations of GVs in between a two-row biplane wells turbine (BWT) was introduced and analyzed for the performance improvement. The fluid flow was simulated numerically with a commercial software ANSYS CFX 16.1. The Reynolds-averaged Navier–Stokes equations with the k-ω turbulence closure model were solved for different designs and flow conditions. For the base model, the results from simulation and experiments are in close agreement. Among the designs considered, the configuration, where the blades are in one line (zero circumferential angle between blades of two plane) and the midplane guide vane has concave side to the leading edge of the blade, performed relatively better. However, the performance was still less compared to the base model. The reason behind the reduction in performance from the base model is attributed to the blockage of flow and the change of flow path occurring due to the presence of the midplane GVs. The flow analysis of different cases and the comparison with the base model are presented in the current study.

7 citations

Book ChapterDOI

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01 Jan 2022
TL;DR: A comprehensive review of the state-of-the-art of the Wells turbine is presented in this article to familiarize the reader with the state of the art of Wells turbine.
Abstract: Wells turbine is an axial flow bi-directional turbine used for wave energy conversion by Oscillating Water Column (OWC) system. Different variations of Wells turbine have been studied and tested to find out the best rotor geometry. A comprehensive review of Wells turbine is presented here to familiarize the reader with the state of the art of Wells turbine. Turbines are broadly classified into two types: monoplane and biplane, with further classifications including attachment of guide vanes and variation of blade pitch angles. Numerical optimization works carried out on air turbines for wave energy system are also presented in this chapter. Turbines with optimized geometry give a better performance compared to standard turbines in terms of overall system performance, efficiency, and energy absorption.

3 citations


References
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Journal ArticleDOI

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TL;DR: In this paper, two new two-equation eddy-viscosity turbulence models are presented, which combine different elements of existing models that are considered superior to their alternatives.
Abstract: Two new two-equation eddy-viscosity turbulence models will be presented. They combine different elements of existing models that are considered superior to their alternatives. The first model, referred to as the baseline (BSL) model, utilizes the original k-ω model of Wilcox in the inner region of the boundary layer and switches to the standard k-e model in the outer region and in free shear flows. It has a performance similar to the Wilcox model, but avoids that model's strong freestream sensitivity

12,746 citations

Journal ArticleDOI

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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.
Abstract: The wave energy devices currently in operation in the United Kingdom and India and those that are to be built in Europe are based on the principle of the oscillating water-air column. In these devices the pneumatic energy of the oscillating air column is converted to mechanical energy of rotation by a Wells turbine. A monoplane (single plane) Wells turbine can absorb only a certain maximum pneumatic pressure amplitude due to tip speed limitations. For wave energy devices which produce large amplitudes of pneumatic pressure a biplane Wells turbine with or without guide vanes can be used. The prediction methods currently available and parameters controlling the aerodynamic performance of the Wells turbines are reviewed. Some novel techniques to improve the performance of Wells turbine are suggested.

253 citations

Journal ArticleDOI

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TL;DR: In this article, the state of the art in self-rectifying impulse air turbines is reviewed and the optimum parameters for the fixed-guide-vane impulse turbine are also presented.
Abstract: Oscillating Water Column based wave energy plants convert wave energy into low pressure pnuematic power in the form of bi-directional air flows. Air turbines which are capable of rotating uni-directionally in bi-directional air flow, otherwise also known as self-rectifying turbines, are used to extract mechanical shaft power which is further converted into electrical power by a generator. This paper reviews the state of the art in self-rectifying impulse air turbines. New results on optimum parameters for the fixed-guide-vane impulse turbine are also presented. Starting characteristics and conversion efficiencies of two types of impulse turbines are compared with the well known Wells turbine.

185 citations


Additional excerpts

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Journal ArticleDOI

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01 Mar 1997
TL;DR: Several types of single-plane and multiplane Wells turbines are investigated and compared in this paper, where the turbines' aerodynamic losses and overall performances are presented and two successful methods of swirl energy recovery are studied in detail.
Abstract: Several types of single-plane and multiplane Wells turbines are investigated and compared. The turbines’ aerodynamic losses and overall performances are presented and two successful methods of swirl energy recovery are studied in detail. Guide vanes were fitted to a monoplane turbine whereas the rotors of a biplane turbine were contra-rotated. A double-shaft biplane turbine was also tested. The contra-rotating turbine had an operational range which was similar to that of the monoplane turbine with guide vanes, achieved a similar peak efficiency, but performed better in the post-stall region and also was found to be able to accommodate a much higher pressure-flow ratio.

131 citations

Journal ArticleDOI

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TL;DR: In this paper, the effects of tip-gap size on the tip-leakage vortical structures and velocity and pressure fields were investigated using large-eddy simulation, with the objective of providing guidelines for controlling tip-Leakage cavitation and viscous losses associated with the tip leakage flow.
Abstract: The effects of tip-gap size on the tip-leakage vortical structures and velocity and pressure fields are investigated using large-eddy simulation, with the objective of providing guidelines for controlling tip-leakage cavitation and viscous losses associated with the tip-leakage flow The effects of tip-gap size on the generation and evolution of the end-wall vortical structures are discussed by investigating their evolutionary trajectories and the mean velocity field The tip-leakage jet and tip-leakage vortex are found to produce significant mean velocity gradients, leading to the production of vorticity and turbulent kinetic energy Inside the cascade passage, the peak streamwise velocity deficit and magnitudes of vorticity and turbulent kinetic energy in the tip-leakage vortex are reduced as the tip-gap size decreases The present analysis indicates that the mechanisms for the generation of vorticity and turbulent kinetic energy are mostly unchanged by the tip-gap size variation However, larger tip-ga

98 citations