Effect of Guide Vane Angle on Wells Turbine Performance
15 Dec 2014-
TL;DR: In this article, a commercial code ANSYSCFX v14.0 was used for the simulations at different flow coefficients, different angles and a constant rotational speed, and the turbulence model was k-ω SST.
Abstract: Wells turbines are used in oscillating water column wave energy system and the turbine has a stagger angle of 90 o . Numerical analysis is performed to analyze the performance of the turbine in the present work. A commercial code ANSYSCFX ® v14.0 was used for the simulations at different flow coefficient, different angles and a constant rotational speed. The turbulence model was k-ω SST. Higher guide vane angle produced higher efficiency of the turbine and the efficiency (enhanced) change was contributed because of the vortex formation in different locations in the flow passage or near the blade surface.
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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
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...
33 citations
Cites background from "Effect of Guide Vane Angle on Wells..."
...Halder and Samad (2014) carried out numerical analysis to study the effect of guide vane angle on the performance of Wells turbine....
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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.
8 citations
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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TL;DR: In this paper, an unsteady 3-dimensional Navier-Stokes numerical simulation of the Wells turbine was performed and the authors found that the hysteretic behavior was associated with a streamwise vortical flow appearing near the blade suction surface.
56 citations
TL;DR: In this article, the effect of 3D guide vanes on the performance of the Wells turbine has been investigated experimentally by testing a model under steady flow conditions, and the running and starting characteristics under irregular flow conditions have been obtained by a computer simulation using quasi-steady analysis.
53 citations
TL;DR: In this article, the performance of a Wells turbine with various non-uniform tip clearances was investigated using computational fluid dynamics (CFD) using numerical models of a NACA0020 blade profile under steady flow conditions.
51 citations
"Effect of Guide Vane Angle on Wells..." refers background in this paper
...Although the non-uniform TC performance was better but manufacturing difficulty may arise [10]....
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01 Jan 2002
TL;DR: In this paper, an unsteady 3-dimensional Navier-Stokes numerical simulation of the Wells turbine was performed and the authors found that the hysteretic behavior was associated with a streamwise vortical flow appearing near the blade suction surface.
Abstract: A Wells turbine blade for wave power conversion has hysteretic characteristics in a reciprocating flow. The hysteretic loop is opposite to the well-known dynamic stall of an airfoil. In this paper, the mechanism of the hysteretic behavior was elucidated by an unsteady 3-dimensional Navier-Stokes numerical simulation. It was found that the hysteretic behavior was associated with a streamwise vortical flow appearing near the blade suction surface. And also the effects of solidity, setting angle and blade thickness on the hysteretic characteristics of the Wells turbine have been discussed.
48 citations
"Effect of Guide Vane Angle on Wells..." refers background in this paper
...[16] investigated that the hysteretic behavior and the mechanism to change the vortex intensity....
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TL;DR: In this article, the authors proposed the use of a symmetrical duct in the form of a venturi tube with turbine rotor located at throat to enhance the turbine performance, and the effects of duct area ratio and duct angle are investigated in order to optimize Wells turbine performance.
46 citations