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 1,232 times in the last 30 days. (as of: 06/09/2013)
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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 in spite of the direction of the air flow. Its blades feature a symmetrical ...
en.wikipedia.org/wiki/Wells_turbine
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Wells turbine | Facebook - Log In
Wells turbine. 12 likes · 1 talking about this. ... Content from the Wikipedia article Wells turbine (contributors) licensed under CC-BY-SA. Freebase. Content from ...
www.facebook.com/pages/Wells-turbine/111313058919483
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Performance of Wells turbine with guide vanes for wave energy ...
In order to improve the performance of a Wells turbine, the effect of guide vanes with various gaps between turbine rotor and guide vane has been clarified by ...
link.springer.com/article/10.1007%2Fs11630-996-0002-1
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Improved Design of High Solidity Wells Turbine
4pascazio@poliba.it. Abstract— The Wells turbine is a self-rectifying axial-flow ... high solidity Wells turbines are considered, it is crucial to take into account that ...
www.see.ed.ac.uk/~shs/EWTEC%202011%20full/papers/129.pdf
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numerical analysis of wells turbine for wave power conversion
The Wells turbine is the oldest concept of the self- ... profiles for the Wells turbine due to high efficiency ... to determine performance curves of Wells turbines ...
hrcak.srce.hr/file/135694
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Insight analysis of biplane Wells turbine performance
Wells turbines are very promising in converting wave energy. Improving the design and performance of Wells turbines requires deep understanding of the ...
www.sciencedirect.com/science/article/pii/S0196890412000519
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Aerodynamics of the wells turbine
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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IEEE Xplore - Wells turbine control in wave power generation plants
In this paper a Wells turbine control is presented. For this purpose, a control scheme for the flow coefficient is derived based on the addition of external ...
ieeexplore.ieee.org/xpl/articleDetails.jsp?reload=true&arnumber=5075202
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IEEE Xplore - Neural control of the Wells turbine-generator module
Wave energy is one of the most promising forms of ocean renewable sources because of its high availability. The Wells turbine has been one of the defining ...
ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5400638
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Dynamic Response of Variable Pitch Wells Turbines - Wavegen
experimental investigation concerning the aerodynamic performance of a variable pitch. Wells turbine. Initial comparisons are made with steady state tests which ...
www.wavegen.co.uk/pdf/variablepitchwellsturbine.pdf
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 in ... Alan Arthur Wells of Queen's University Belfast in the late 1970s.
[PDF]numerical analysis of wells turbine for wave power conversion
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 .
Flow on blades of wells turbine for wave power generation - Springer
Mar 1, 2006 ... Wells turbine has the cascade whose stagger angle is 90°, namely the ... in Mechanical Engineering in 2002 from the University of Tokyo.
[PDF]Aero-Acoustic Analysis of the Wells Turbine with Guide ... - ICOE 2012
Oct 17, 2012 ... Aero-Acoustic Analysis of the Wells turbine with Guide Vanes. R. Starzmann, T. Zhu, C. Moisel, Th. Carolus. University of Siegen,. Institute of ...
[PDF]Improved Design of High Solidity Wells Turbine
rectifying Wells turbine (Fig. 2). The latter is a peculiar wind turbine invented by Prof. Alan Wells of the Queen's. University of Belfast in the 80's. Its uniqueness ...
AERODYNAMICS OF MONOPLANE WELLS TURBINE-A REVIEW
Title, AERODYNAMICS OF MONOPLANE Wells turbine-A REVIEW. Authors, S.Raghunathan, Department of Aeronautical Engineering, Queen's University; ...
Study On a Wells Turbine For Wave Power Conversion ... - OnePetro
Authors, T. Setoguchi, M. Takao, K. Kaneko, Saga University, Saga, Japan; ... In order to improve the performance of a Wells turbine, porous fences have been ...
Wells turbine | Facebook - Log In
Wells turbine. ... Queen's University Belfast · Wind turbine. Wikipedia. Content from the Wikipedia article Wells turbine (contributors) licensed under CC-BY-SA ...
Performance investigations of the LIMPET counter-rotating Wells ...
Queen's University Belfast · Study at Queen's · Research · Business ... Performance investigations of the LIMPET counter-rotating Wells turbine. Research output: ...
Performance of the Islay Wells Air Turbine
Prediction of performance of the Wells wave power turbine. Department of Engineering, University of Cambridge (see also IEE Conference, 1980, paper 192, ...
Books on the term Wells turbine
Fluid Mechanics and Thermodynamics of Turbomachinery
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 Engineering Research Advances
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 ...
Ocean Wave Energy: Curent Status and Future Perspectives ; with ...
Ocean Wave Energy: Curent Status and Future Perspectives ; with ...
Joāo Cruz, 2008
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 ...
Renewable Energy Made Easy: Free Energy from Solar, Wind, ...
Renewable Energy Made Easy: Free Energy from Solar, Wind, ...
David Craddock, 2008
During the air's tumultuous journey back and forth between the air chamber, some of the air travels through a turbine generator that produces electricity. Perhaps the most common type of turbine is the Wells turbine, which is used in several ...
The Seventh Asian Congress of Fluid Mechanics
The Seventh Asian Congress of Fluid Mechanics
National Aerospace Laboratories (India), 1997
Introduction A Wells turbine is a self-rectifying air turbine which is expected to be widely used in wave energy devices with ... There are many reports which describe the performance of the Wells turbine both at starting and at running conditions ...
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Blog posts on the term
Wells turbine
www.windaction.org | Ocotillo Wells: Blade breaks off wind-powered turbine, prompts investigation
No injuries were reported, according to the El Centro newspaper. But worldwide use of that model of turbine has been suspended while the mishap is investigated by its manufacturer, Siemens. ...In April, a blade broke from a similar Siemens turbine at an Iowa wind energy facility, the Imperial Valley Press reported.
www.windaction.org/news/38391
Experimental investigation in a Wells turbine under bi-directional flow | mhktechpapers
by bpolagye | March 2013 · 1:08 am.
mhktechpapers.wordpress.com/2013/03/28/experimental-investigation-in-a-wells-turbine-under-bi-directional-flow/
King Island wind farm: Wells Haslem, PR firm, joins fight | Crikey
The PR war over wind turbines on King Island is heating up as professional operatives jump on board. Ben Haslem and John Wells are backing the No TasWind Farm Group to run the project off the island.
www.crikey.com.au/2013/05/17/sydney-spinners-sail-to-king-island-for-anti-turbine-fight/
Comparison of 0.6m Impulse and Wells Turbines for Wave Energy Conversion Under Similar Conditions
This paper presents a comparison of 0.6m Impulse and Wells turbines with same hub to tip ratio of 0.6 for wave energy power conversion under similar conditions. A 0.6m Wells turbine rotor with a solidity of 0.
www.slashdocs.com/kpuypm/comparison-of-6m-impulse-and-wells-turbines-for-wave-energy-conversion-under-similar-conditions.html
PrairiePundit: Company uses old chopper engines for fracking wells
prairiepundit.blogspot.com/2013/05/company-uses-old-chopper-engines-for.html
wells turbine by random - Thingiverse
Thingiverse is a universe of things. Download our files and build them with your lasercutter, 3D printer, or CNC.
www.thingiverse.com/thing:1233
Wells to mull new wind plan; Apex has revised project first unveiled in 2010 | Wind Energy News
When Apex Wind Energy initially looked into developing a wind farm in Wells County, it talked about spending $336 million on a complex that would have 87 ...
www.wind-watch.org/news/2013/05/05/wells-to-mull-new-wind-plan-apex-has-revised-project-first-unveiled-in-2010/
UK public favours wind turbines over shale gas wells, poll finds | marketspace
More than two-thirds of people would rather have a wind turbine than a shale gas well near their home
marketspace.thinktosustain.com/2012/10/uk-public-favours-wind-turbines-over-shale-gas-wells-poll-finds-2/
Crikey: Sydney spinners sail to King Island for ... - Tasmanian Times
Tasmanian Times is a forum of discussion and dissent - a cheeky, irreverent challenge to the mass media’s obsession with popularity, superficiality and celebrity.
tasmaniantimes.com/index.php/article/crikey-sydney-spinners-sail-to-king-island-for-anti-turbine-fight
There Exist Interesting Things: Wells Turbine
The Wells turbine rotates continuously in one direction in spite of the direction of the airflow (http://en. wikipedia.
existentialquantification.blogspot.com/2011/06/wells-turbine.html
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