Wells turbine
The Wells turbine is a low-pressure air turbine that rotates continuously in one direction in spite of the direction of the air flow. Its blades feature a symmetrical airfoil with its plane of symmetry in the plane of rotation and perpendicular to the air stream.
It was developed for use in oscillating-water-column wave power plants, in which a rising and falling water surface moving in an air compression chamber produces an oscillating air current. The use of this bidirectional turbine avoids the need to rectify the air stream by delicate and expensive check valve systems.
Its efficiency is lower than that of a turbine with constant air stream direction and asymmetric airfoil. One reason for the lower efficiency is that symmetric airfoils have a higher drag coefficient than asymmetric ones, even under optimal conditions. Also, in the Wells turbine, the symmetric airfoil is used with a high angle of attack (i.e., low blade speed / air speed ratio), as it occurs during air velocity maxima in volatile flow. A high angle of attack causes a condition known as "stall" in which the airfoil loses lift. The efficiency of the Wells turbine in oscillating flow reaches values between 0.4 and 0.7.
This simple but ingenious device was developed by Prof. Alan Arthur Wells of Queen's University Belfast in the late 1970s.

This is an excerpt from the article Wells turbine from the Wikipedia free encyclopedia. A list of authors is available at Wikipedia.
The article Wells turbine at en.wikipedia.org was accessed 981 times in the last 30 days. (as of: 11/19/2013)
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Wells turbine - Wikipedia, the free encyclopedia
The Wells turbine is a low-pressure air turbine that rotates continuously in one direction independent of the direction of the air flow. Its blades feature a ...
en.wikipedia.org/wiki/Wells_turbine
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Wells Turbine for Wave Energy Conversion —Improvement of the ...
captured by Wells turbine at low flow coefficient and that the impulse turbine gets the energy at high flow coefficient. As the first step of this study on the proposed ...
www.scirp.org/journal/PaperDownload.aspx?paperID=35161
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Air Turbines for Wave Energy Conversion
Apr 11, 2012 ... Figure 4 shows the Wells turbines with guide vanes [2, 3, 13]. The turbine (turbine diameter of 1.7 m, 2 tandem turbines, NACA0021, 8 blades ...
www.hindawi.com/journals/ijrm/2012/717398/
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A modified Wells turbine for wave energy conversion - ScienceDirect
Wells turbine with its zero blade pitch setting has been used to convert this pneumatic power into uni-directional mechanical shaft power. Measurements in OWC ...
www.sciencedirect.com/science/article/pii/S096014810200006X
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Aerodynamics of the wells turbine - ScienceDirect
The paper describes a theoretical and experimental investigation concerning the aerodynamic performance of the Wells turbine, a self-rectifying axial-flow turbi.
www.sciencedirect.com/science/article/pii/0020740388900124
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NUMERICAL ANALYSIS OF WELLS TURBINE FOR WAVE POWER ...
The Wells turbine as the main part of Oscillating Water Column energy plant is analyzed in this paper. The Wells turbine uses air flow produced by the pressure  ...
hrcak.srce.hr/file/135694
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Guide Vanes Effect of Wells Turbine on OWC Wave Power Plant ...
Index Terms² Wave power plant, Wells turbine with guide vanes, Power fluctuations. I. INTRODUCTION cean wave energy is a renewable energy source with a ...
www.iaeng.org/publication/WCE2007/WCE2007_pp465-469.pdf
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Performance of Wells Turbines for use in Small-Scale Oscillating ...
information about the column dynamics and turbine sizing is obtained. KEY WORDS: Oscillating Water Column, Wells turbine,. Computational Fluid Dynamics.
opus.lib.uts.edu.au/research/bitstream/handle/10453/10958/2008005959.pdf?sequence=1
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Wells turbine customizable by Parkinbot - Thingiverse
Jan 12, 2014 ... This is my own design of a 3D printable model of the classical Wells turbine. Turbines of this kind may be operated in bidirectional airflows and ...
www.thingiverse.com/thing:224320
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Detailed CFD analysis of the steady flow in a Wells turbine under ...
By Sergio Camporeale in Wave Energy and Wells turbine. "This paper presents the results of the numerical simulations carried out to evaluate the performance ...
www.academia.edu/229122/Detailed_CFD_analysis_of_the_steady_flow_in_a_Wells_turbine_under_incipient_and_deep_stall_conditions
Search results for "Wells turbine"
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Wells turbine in science
Wells turbine - Wikipedia, the free encyclopedia
The Wells turbine is a low-pressure air turbine that rotates continuously in one direction ... Alan Arthur Wells of Queen's University Belfast in the late 1970s.
Oscillating Water Column - Wikipedia, the free encyclopedia
The Wells turbine, designed in the late 1970s by professor Alan Arthur Wells at Queen's University Belfast, is a bidirectional turbine that uses symmetrical airfoils  ...
[PDF]Download Sample pages 1 PDF - Springer
design of a Wells air turbine for OWC ocean wave energy plants. In particular, the ... Since the conception of the Wells turbine [1] at Queen's University Belfast.
[PDF]Improved Design of High Solidity Wells Turbine - ResearchGate
Abstract— The Wells turbine is a self-rectifying axial-flow ... high solidity Wells turbines are considered, it is crucial to take .... University of Belfast in the 80's.
[PDF]Guide Vanes Effect of Wells Turbine on OWC Wave Power Plant ...
Index Terms² Wave power plant, Wells turbine with guide vanes, Power fluctuations. ... University of Technology,Iran (e-mail:Darabi_ahmad@hotmail. com).
[PDF]NUMERICAL ANALYSIS OF WELLS TURBINE FOR WAVE POWER ...
The Wells turbine is the oldest concept of the self- rectifying air type turbine. It was introduced in 1976 by Prof. A. A. Wells from the Queen's University in. Belfast .
[PDF]Performance of Wells Turbines for use in Small-Scale Oscillating ...
Electronics and Electrical Engineering, University of Glasgow. Glasgow, G12 ... This paper will assess the viability of small Wells turbines for oscillating water ...
[PDF]Aerodynamics of Monoplane Wells Turbine - A Review - Isope
Department of Aeronautical Engineering, Queen's University, Belfast, United Kingdom ... The Wells turbine is an air turbine suitable for wave energy conversion.
Books on the term Wells turbine
Fluid Mechanics and Thermodynamics of Turbomachinery
Sydney Lawrence Dixon, 1998
Arrangement of Wells turbine and oscillating water column (adapted from Raghunathan era/. 1995). efficient and economical means of converting an oscillating flow of energy into a unidirectional rotary motion for driving an electrical generator ...
Ocean Engineering Research Advances
Alan I. Prescott, 2008
An air turbine which rotates in a single direction and extracts mechanical shaft power from such bi-directional air flow is required to drive a generator to produce electricity. Such a turbine is also called a self-rectifying turbine. The Wells turbine  ...
Fluid Mechanics and Thermodynamics of Turbomachinery
S Larry Dixon, 2005
and also blade thickness ratio, turbulence level at inlet to turbine, frequency of waves and the relative Mach number. It was observed by Raghunathan et al. ( 1987) that the Wells turbine has a characteristic feature which makes it significantly ...
Ocean Wave Energy: Current Status and Future Prespectives
Joao Cruz, 2007
6.1.4 Operational Findings for the Wells turbine Conclusions and designs derived from numerical and laboratory-based modelling of air turbines can only be partially valid. When a turbine is mounted in an oscillating water column, the real ...
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Blog posts on the term
Wells turbine
Wells turbine - Wikipedia, the free encyclopedia
en.wikipedia.org/wiki/Wells_turbine
Effect of duct geometry on Wells turbine performance
www.sciencedirect.com/science/article/pii/S0196890412001690
Aerodynamics of the wells turbine
www.sciencedirect.com/science/article/pii/0020740388900124
Wells turbine customizable by Parkinbot - Thingiverse
This is my own design of a 3D printable model of the classical Wells turbine. Turbines of this kind may be operated in bidirectional airflows and ar
www.thingiverse.com/thing:224320
Ingrid Wells ‹ Pitchside Report
www.pitchsidereport.com/category/ingrid-wells-blog/
Wells Turbine for Wave Energy Conversion —Improvement of the Performance by Means of Impulse Turbine for Bi-Directional Flow
Wells turbine has inherent disadvantages in comparison with conventional turbines: relative low efficiency at high flow coefficient and poor starting characteristics. To solve these problems, the authors propose Wells turbine with booster turbine for wave energy conversion, in order to improve the performance in this study. This turbine consists of three parts: a large Wells turbine, a small impulse turbine with fixed guide vanes for oscillating airflow, and a generator. It was conjectured that, by coupling the two axial flow turbines together, pneumatic energy from oscillating airflow is captured by Wells turbine at low flow coefficient and that the impulse turbine gets the energy at high flow coefficient. As the first step of this study on the proposed turbine topology, the performance of turbines under steady flow conditions has been investigated experimentally by model testings. Furthermore, we estimate mean efficiency of the turbine by quasi-steady analysis.
www.scirp.org/journal/PaperInformation.aspx?PaperID=35161
Detailed CFD analysis of the steady flow in a Wells turbine under incipient and deep stall conditions | Sergio Camporeale - Academia.edu
By Sergio Camporeale in Wave Energy and Wells turbine. "This paper presents the results of the numerical simulations carried out to evaluate the performance of a high solidity Wells turbine designed for an oscillating water column wave energy
www.academia.edu/229122/Detailed_CFD_analysis_of_the_steady_flow_in_a_Wells_turbine_under_incipient_and_deep_stall_conditions
ROTOR BLADE DESIGN FOR A WELLS TURBINE
View Technologies and Patents for sale or license: ROTOR BLADE DESIGN FOR A Wells turbine
www.ideaconnection.com/patents/15103-ROTOR-BLADE-DESIGN-FOR-A-WELLS-TURBINE.html
Wells Turbine Simulation -- CFD Online Discussion Forums
Hi, I am trying to set up a Wells turbine simulation so that i can analyse different shaped nose cones and see what effect they may have upon the
www.cfd-online.com/Forums/main/147228-wells-turbine-simulation.html
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