Numerical investigation on the performance of Wells turbine with non-uniform tip clearance for wave energy conversion

Taha, Zahari; Sugiyono, .; Ya, Tuan Mohammad Yusoff Shah Tuan; Sawada, Tatsuo

doi:10.1016/j.apor.2011.07.002

Cited by 57 publications

(22 citation statements)

References 16 publications

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“…Taha et al [27] reported a uniform TC with different chord length ratios. Although a non-uniform TC has a better performance [9], the manufacturing difficulty may arise.…”

Section: Introductionmentioning

confidence: 99%

“…Efforts have been made to increase the performance of the Wells turbine by changing duct geometry [2], designing monoplane and biplane Wells turbine [3], optimizing blade profile and thickness [4], modifying airfoil profile [5e7], making non-symmetric airfoil blade shape [8] and non-uniform tip gap [9], inserting end plate [10], sweeping [11,12], changing blade pitch angle [13,14], etc. Other efforts involve modification of guide vane angle [15e17], bidirectional flow [18], variable chord [19], bi-plane unidirectional blade [20], counter rotating blade [21,22], hysteretic behavior with unsteady flow [23], etc.…”

Section: Introductionmentioning

confidence: 99%

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High performance ocean energy harvesting turbine design–A new casing treatment scheme

Halder

Samad

Kim

et al. 2015

Energy

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“…Taha et al [27] reported a uniform TC with different chord length ratios. Although a non-uniform TC has a better performance [9], the manufacturing difficulty may arise.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High performance ocean energy harvesting turbine design–A new casing treatment scheme

Halder

Samad

Kim

et al. 2015

Energy

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“…A large number of W-T CFD models relied on solutions of the steady averaged Navier-Stokes equation [37,113,139,140]. A large number of W-T CFD models relied on solutions of the steady averaged Navier-Stokes equation [37,113,139,140].…”

Section: Cfd Modeling Goals Of W-tmentioning

confidence: 99%

“…The experimental work is performed at a test rig capable of producing reversing air flows. Many of CFD investigations employ this experimental work as a validation case such as T. H. Kim, et al [76,113] and Zahari Taha, et al [139,140], in addition to several other CFD works in [77,81,82,129,134,135]. The piston can be driven back and forth by means of three ball screws acted upon by a DC servomotor.…”

Section: Validation Of Cfd Modelsmentioning

confidence: 99%

Wells turbine for wave energy conversion: a review

Shehata

Xiao

Saqr

et al. 2016

Int. J. Energy Res.

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Summary In the past 20 years, the use of wave energy systems has significantly increased, generally depending on the oscillating water column concept. Wells turbine is one of the most efficient oscillating water column technologies. This article provides an updated and a comprehensive account of the state‐of‐the‐art research on Wells turbine. Hence, it draws a roadmap for the contemporary challenges, which may hinder future reliance on such systems in the renewable energy sector. In particular, the article is concerned with the research directions and methodologies, which aim at enhancing the performance and efficiency of Wells turbine. The article also provides a thorough discussion of the use of CFD for performance modeling and design optimization of Wells turbine. It is found that a numerical model using the CFD code can be employed successfully to calculate the performance characteristics of W‐T as well as other experimental and analytical methods. The increase of research papers about CFD, especially in the last 5 years, indicates that there is a trend that considerably depends on the CFD method. Copyright © 2016 John Wiley & Sons, Ltd.

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“… studied the effect of the blade aspect ratio and the rotor hub‐to‐tip ratio on the performance of Wells turbines. Authors have also investigated other geometrical parameters like the effect of inlet guide vanes , blade setting angle , end plates , and tip clearance . Shaaban and Abdel Hafiz presented numerical optimization of the Wells turbine duct geometry.…”

Section: Introductionmentioning

confidence: 99%

Wave energy harvesting using a novel turbine rotor geometry

Shaaban

2016

Int. J. Energy Res.

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Summary Wells turbines provide a practical solution for wave energy harvesting. The low aerodynamic efficiency of Wells turbines tangibly reduces their output power. Both the turbine efficiency and output power depend on the turbine solidity. The turbine solidity decreases from rotor hub to rotor tip for the commonly used rotors with constant chord‐length blades. The present work introduces a novel Wells turbine rotor geometry. This geometry was obtained by numerically optimizing the rotor's radial solidity distribution. The turbine performance with different rotor geometries was numerically simulated by solving the three‐dimensional Reynolds‐averaged Navier–Stocks equation under incompressible and steady state flow conditions. Simple and multi‐objective optimization were implemented in order to obtain the optimum rotor geometry. The present work showed that an improved turbine performance can be achieved by optimizing the turbine radial solidity distribution. Two different optimized rotor geometries were obtained and presented. The first rotor geometry improved the turbine efficiency by up to 4.7% by reducing its pressure drop. The second rotor geometries enhanced the turbine output power by up to 10.8%. Copyright © 2016 John Wiley & Sons, Ltd.

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Numerical investigation on the performance of Wells turbine with non-uniform tip clearance for wave energy conversion

Cited by 57 publications

References 16 publications

High performance ocean energy harvesting turbine design–A new casing treatment scheme

High performance ocean energy harvesting turbine design–A new casing treatment scheme

Wells turbine for wave energy conversion: a review

Wave energy harvesting using a novel turbine rotor geometry

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