Straight Wing Vertical Axis Wind Turbines: A Flow Analysis

Horiuchi, Kenji; Ushiyama, Izumi; Seki, Kazuichi

doi:10.1260/030952405774354840

Cited by 16 publications

(9 citation statements)

References 3 publications

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“…compared 2D and 3D results using the unsteady RNG k-ε turbulence model and claimed that an appropriate time step is required to obtain the accurate solution. Horiuchi, Ushiyama, and Seki (2005) examined the H-rotor performance using the detached eddy simulations (DES). Comparing the calculated and experimentally measured wind velocity, they concluded that the numerical simulation was applicable to the flow analysis for H-rotors.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of vortex dynamics in an H-rotor vertical axis wind turbine

Chen

Lian

2015

Engineering Applications of Computational Fluid Mechanics

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We study the vortex dynamics of a two-dimensional H-rotor wind turbine using a Navier-Stokes solver. The k-ε turbulence model with the wall function is used as the turbulence closure. A sliding mesh technique is employed to handle the blade rotation. The vortex-blade interaction is systematically investigated and its influence on the force generation is discussed. Our simulations show that the vortex-blade interaction largely depends on the solidity and tip speed ratio. We further study the impact of solidity on the turbine performance. Our simulations show that the peak torque per blade decreases with the solidity while the peak torque azimuthal angle increases with the solidity. Our simulations also show that the increase in the azimuthal angle is more significant at low tip speed ratios than at high tip speed ratios. The impact of blade thickness is studied. Our simulations show that a thicker airfoil has a higher torque coefficient than a thinner airfoil. However, because for the thinner airfoil its peak torque occurs at a high tip speed ratio, the thinner airfoil has an overall higher power coefficient than the thicker airfoil.

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Section: Introductionmentioning

confidence: 99%

Numerical investigation of vortex dynamics in an H-rotor vertical axis wind turbine

Chen

Lian

2015

Engineering Applications of Computational Fluid Mechanics

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“…In recent years, however, improvements in the availability of high‐performance computing have allowed the aerodynamics of wind turbines to be computed from first principles using the Navier‐Stokes equations. Hansen and Sørensen,7 as well as Simão Ferreira et al ,8 have used computational schemes that solve the Reynolds‐Averaged Navier‐Stokes (RANS) equations to simulate the two‐dimensional aerodynamics of an aerofoil while in a planar, cyclic motion designed to emulate that of the blades of a vertical‐axis wind turbine, whilst detached‐eddy simulations of a similar aerofoil configuration have been performed by Horiuchi et al 9…”

Section: Introductionmentioning

confidence: 99%

Simulating the aerodynamic performance and wake dynamics of a vertical‐axis wind turbine

Scheurich¹,

Fletcher²,

Brown³

2011

Wind Energy

100

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The accurate prediction of the aerodynamics and performance of vertical-axis wind turbines is essential if their design is to be improved but poses a signifi cant challenge to numerical simulation tools. The cyclic motion of the blades induces large variations in the angle of attack of the blades that can manifest as dynamic stall. In addition, predicting the interaction between the blades and the wake developed by the rotor requires a high-fi delity representation of the vortical structures within the fl ow fi eld in which the turbine operates. The aerodynamic performance and wake dynamics of a Darrieus-type vertical-axis wind turbine consisting of two straight blades is simulated using Brown’s Vorticity Transport Model. The predicted variation with azimuth of the normal and tangential force on the turbine blades compares well with experimental measurements. The interaction between the blades and the vortices that are shed and trailed in previous revolutions of the turbine is shown to have a signifi cant effect on the distribution of aerodynamic loading on the blades. Furthermore, it is suggested that the disagreement between experimental and numerical data that has been presented in previous studies arises because the blade–vortex interactions on the rotor were not modelled with sufficient fidelity

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“…Hansen and Sørensen [5], as well as Simão Ferreira et al [6] have used computational schemes that solve the Reynolds-averaged Navier-Stokes equations to simulate the twodimensional aerodynamics of an airfoil while in a planar, cyclic motion designed to emulate that of the blades of a vertical-axis wind turbine. Detached-eddy simulations of a similar airfoil configuration have been performed by Horiuchi et al [7]. Although these conventional computational fluid dynamics (CFD) methods have yielded, to some extent, reasonable predictions of the behavior of simple airfoil and rotor geometries, there have been no publications in the literature, to the authors' knowledge, in which the full threedimensional flowfield of a complex rotor system with curved, helically twisted blades has accurately been modeled from first principles.…”

mentioning

confidence: 99%

Effect of Dynamic Stall on the Aerodynamics of Vertical-Axis Wind Turbines

Brown

Scheurich

2011

AIAA Journal

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Accurate simulations of the aerodynamic performance of vertical-axis wind turbines pose a significant challenge for computational fluid dynamics methods. The aerodynamic interaction between the blades of the rotor and the wake that is produced by the blades requires a high-fidelity representation of the convection of vorticity within the wake. In addition, the cyclic motion of the blades induces large variations in the angle of attack on the blades that can manifest as dynamic stall. The present paper describes the application of a numerical model that is based on the vorticity transport formulation of the Navier-Stokes equations, to the prediction of the aerodynamics of a verticalaxis wind turbine that consists of three curved rotor blades that are twisted helically around the rotational axis of the rotor. The predicted variation of the power coefficient with tip speed ratio compares very favorably with experimental measurements. It is demonstrated that helical blade twist reduces the oscillation of the power coefficient that is an inherent feature of turbines with nontwisted blade configurations.

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Straight Wing Vertical Axis Wind Turbines: A Flow Analysis

Cited by 16 publications

References 3 publications

Numerical investigation of vortex dynamics in an H-rotor vertical axis wind turbine

Numerical investigation of vortex dynamics in an H-rotor vertical axis wind turbine

Simulating the aerodynamic performance and wake dynamics of a vertical‐axis wind turbine

Effect of Dynamic Stall on the Aerodynamics of Vertical-Axis Wind Turbines

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