Circulation Control Applied to Wind Turbines

McGrain, David; Angle, Gerald M.; Graham, Henry; Pertl, Emily D.; Smith, James E.

doi:10.1115/imece2010-39028

Cited by 3 publications

(3 citation statements)

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“…This research considers the technical feasibility of utilizing active CC technology for improving VAWT aerodynamic efficiency, particularly at low wind speeds when performance is compromised relative to HAWTs. Although CC technology has previously been considered for wind turbine applications [19][20][21][22][23][24][25][26][27][28][29] few researchers consider the system requirements essential to determine if the technology is feasible for deployment on medium to large VAWTs.…”

Section: Introductionmentioning

confidence: 99%

Application of Circulation Controlled Blades for Vertical Axis Wind Turbines

Shires

Kourkoulis

2013

Energies

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Abstract:The blades of a vertical axis wind turbine (VAWT) rotor see an inconsistent angle of attack through its rotation. Consequently, VAWT blades generally use symmetrical aerofoils with a lower lift-to-drag ratio than cambered aerofoils tailored to maximise horizontal axis wind turbine rotor performance. This paper considers the feasibility of circulation controlled (CC) VAWT blades, using a tangential air jet to provide lift and therefore power augmentation. However CC blade sections require a higher trailing-edge thickness than conventional sections giving rise to additional base drag. The choice of design parameters is a compromise between lift augmentation, additional base drag as well as the power required to pump the air jet. Although CC technology has been investigated for many years, particularly for aerospace applications, few researchers have considered VAWT applications. This paper considers the feasibility of the technology, using Computational Fluid Dynamics to evaluate a baseline CC aerofoil with different trailing-edge ellipse shapes. Lift and drag increments due to CC are considered within a momentum based turbine model to determine net power production. The study found that for modest momentum coefficients significant net power augmentation can be achieved with a relatively simple aerofoil geometry if blowing is controlled through the blades rotation.

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Section: Introductionmentioning

confidence: 99%

Application of Circulation Controlled Blades for Vertical Axis Wind Turbines

Shires

Kourkoulis

2013

Energies

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“…Interest was lost as other energy technologies outpaced development of the VAWT, but renewed investigations in the effort picked up at WVU in 2008 due to availability of pneumatic values that could be located within the blade. Recently, the concept of using CC to augment lift for increased energy capture was overviewed by Smith [25] and a blade shape and internal pneumatic design was investigated by Graham and Panther [15] [26]. The combination of CC and a VAWT that contains a valving system with upper and lower trailing edge jets has become known as the CC-VAWT within the current effort.…”

Section: Circulation Controlmentioning

confidence: 99%

Dynamic Circulation Control for a Vertical Axis Wind Turbine using Virtual Solidity Matching

Wilhelm¹,

Nix²,

Panther³

et al. 2017

SGRE

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Vertical Axis Wind Turbines (VAWTs) with fixed pitch blades have a limited power capture performance envelope as the Tip Speed Ratio (TSR) changes. Circulation Control (CC) has been proposed and simulated to possibly increase power capture of a VAWT using constant CC jet momentum, but a practical method of minimizing CC usage has yet to be explored. In addition, VAWTs are typically limited in power capture performance either by a maximum peak at a small set of TSR or wide operating TSR at fractions of the peak performance based on the design solidity. Both the reduced jet usage and solidity limitation were addressed by developing a method of dynamically using CC to perform a virtual solidity change. The developed method described within this work used CC to change blade aerodynamics to specifically match a maximum performing static solidity or wake shape at a given TSR. Simulation results using an existing aerodynamics model indicated a significant reduction in the required CC jet momentum compared to a constant CC system along with control over power capture for a CC-VAWT.

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“…The ongoing need for improved extraction methods to harvest renewable resources, including wind power, have prompted research by the Center for Industrial Research Applications at West Virginia University (herein "CIRA" and "WVU", respectively). Recent work at CIRA and WVU revealed proof of concept that circulation control (CC) can be applied to VAWT blades to expand the operational envelope and performance (31) (32). Large aerodynamic improvements were proven for a conventional NACA0018, modified to include TE circulation control (herein described as "CCNACA0018"), with computational (33) (34), analytical (31) (35) (36) (37), and experimental methods (38).…”

Section: Circulation Control Vertical Axis Wind Turbine (Ccvawt)mentioning

confidence: 99%

Aerodynamic Response of a Pitching Airfoil with Pulsed Circulation Control for Vertical Axis Wind Turbine Applications

Panther¹

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Vertical Axis Wind Turbines (VAWTs) have experienced a renewed interest in development for urban, remote, and offshore applications. Past research has shown that VAWTs cannot compete with Horizontals Axis Wind Turbines (HAWTs) in terms of energy capture efficiency. VAWT performance is plagued by dynamic stall (DS) effects at low tip-speed ratios (), where each blade pitches beyond static stall multiple times per revolution. Furthermore, for <2, blades operate outside of stall during over 70% (plus) year sabbatical, and the unhesitant welcome on my return. You know who you are. I love and appreciate you all more than you will ever know. I would like to thank my family for their support for the duration of this process, especially Uma, Pap, and Noni for their dependability and endless (and affordable) daycare services for Bode. I would particularly like to thank my Mom and Dad for unbounded support and encouragement to get me here. I would also like to especially thank Jess for her own selfless and enduring support, patience, and love while I completed this final degree. I could not have finished this without her behind me. There should be an honorary degree for such people. A small army of people made sacrifices to complete this project, but unfortunately only one person gets the credit. Finally, I would like to thank Bode Odie, the dinosaur boy, for unknowingly motivating me with constant laughter, innocence, curiosity, and love. Thank You. v

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Circulation Control Applied to Wind Turbines

Cited by 3 publications

References 0 publications

Application of Circulation Controlled Blades for Vertical Axis Wind Turbines

Application of Circulation Controlled Blades for Vertical Axis Wind Turbines

Dynamic Circulation Control for a Vertical Axis Wind Turbine using Virtual Solidity Matching

Aerodynamic Response of a Pitching Airfoil with Pulsed Circulation Control for Vertical Axis Wind Turbine Applications

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