Aerodynamic performance of vertical and horizontal axis wind turbines

Maydew, R.C.; Klimas, Paul C.

doi:10.2514/3.48033

Cited by 19 publications

(6 citation statements)

References 4 publications

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“…Several designs of VAWTs have in the past achieved maximum power coefficients in line with current horizontal axis wind turbines (HAWTs) (see Ashwill Maydew and Klimas ). However, to decrease the cost of energy of VAWTs, it is necessary to design aerofoils that are both aerodynamically and structurally efficient.…”

Section: Introductionmentioning

confidence: 99%

Aerofoil optimization for vertical‐axis wind turbines

Ferreira

Geurts

2014

Wind Energy

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An expression for the aerodynamic optimization of aerofoils for 2D lift driven vertical-axis wind turbines is derived as a function of lift slope and drag. As lift slope is proportional to aerofoil thickness, the aerodynamic optimum is found in thick aerofoils, which are also structurally advantageous. Using a genetic optimization algorithm, the objective function is used to generate aerofoils whose performance in a vertical-axis wind turbine is calculated using a potential flow solution of the induction field and 2D polars calculated with XFOIL. The results demonstrate power and structural gains. This approach can lead to reductions in rotor mass due to the thicker and thus stiffer aerofoils, without compromising aerodynamic performance. Copyright © 2014 John Wiley & Sons, Ltd. weighted average of the drag coefficient distribution over a rotation, C l lift coefficient, C l˛s lope of the C l -˛-curve,

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Section: Introductionmentioning

confidence: 99%

Aerofoil optimization for vertical‐axis wind turbines

Ferreira

Geurts

2014

Wind Energy

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“…Similar relation can be obtained for yaw-direction power P y and C' p . The relations are given by 3 …”

Section: B Wind Turbine Modelmentioning

confidence: 99%

“…Traditionally, there are two categories of wind turbines, called HAWT (horizontal axis wind turbine) and VAWT (vertical axis wind turbine) [3]. VAWTs have the following advantages; no yaw mechanism is required since only the rotor rotates, and all components related to generator are located at the ground level [4].…”

Section: Introductionmentioning

confidence: 99%

MPPT and yawing control of a new horizontal-axis wind turbine with two parallel-connected generators

Lee

Choy

et al. 2011

8th International Conference on Power Electronics - ECCE Asia

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Commonly used horizontal-axis wind turbines (HAWT) have the following structure: two or three blades, a nacelle which contains power converting equipments, generators, and a tower which supports the nacelle. The generated power is transmitted from the nacelle to the ground. Due to this structure, the power transmission lines are twisted when the nacelle is yawing. Thus, slip ring or additional yaw control mechanism is required. We propose a new structure of HAWT which is free of this transmission line problem. Moreover, the size of inverter can be reduced since two generators are connected in parallel in our mechanism so that power is distributed. A controller for yawing is developed so that it works in harmony with the controller for power generation. An MPPT (Maximum Power Point tracking) algorithm is implemented for the proposed system and is validated by simulation.

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“…VAWT designs have gone through considerable evolution (Figure ), including extensive test campaigns to demonstrate that both HAWTs and VAWTS have comparable peak performance . Commercial and research activity, particularly for utility scale machines, has been limited since the early 1990s, although recent efforts by Sandia National Laboratories (SNL), the EU DeepWind program and others have begun to investigate the application of VAWTs to offshore energy production.…”

Section: Variable Geometry Vertical Axis Wind Turbinementioning

confidence: 99%

Variable geometry wind turbine for performance enhancement, improved survivability and reduced cost of energy

et al. 2014

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The conceptual design and proof‐of‐concept testing of a furling vertical axis wind turbine, suited to large‐scale offshore deployment, is described. Through the implementation of variable geometry capabilities, extreme storm loads can be reduced, and unsteady flow‐related fatigue loads can be minimized thereby reducing capital (structural) and maintenance costs. Moreover, annual power generation can be optimized in real‐time to account for unsteady wind effects related to weather and siting thus improving efficiency and annual power generation. Copyright © 2014 John Wiley & Sons, Ltd.

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Aerodynamic performance of vertical and horizontal axis wind turbines

Cited by 19 publications

References 4 publications

Aerofoil optimization for vertical‐axis wind turbines

Aerofoil optimization for vertical‐axis wind turbines

MPPT and yawing control of a new horizontal-axis wind turbine with two parallel-connected generators

Variable geometry wind turbine for performance enhancement, improved survivability and reduced cost of energy

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