H-Darrieus Wind Turbine with Blade Pitch Control

Paraschivoiu, Ion; Trifu, O.; Saeed, Farooq

doi:10.1155/2009/505343

Cited by 141 publications

(105 citation statements)

References 3 publications

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“…Hwang showed that the performance can be improved by 25% with an optimized pitching angle motion. Paraschivoiu, Trifu, and Saeed (2009) computed the optimal variation of the blades' pitch angle to maximize the power coefficient at given conditions. The optimization was conducted by combining a genetic algorithm and a DMSM code.…”

Section: Engineering Applications Of Computational Fluid Mechanicsmentioning

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: Engineering Applications Of Computational Fluid Mechanicsmentioning

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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“…They stated that applying their pitch control model leads to large improvements in the amount of power extracted from the turbine, thus, highly increasing its overall efficiency. Paraschivoiu et al [18] proposed a procedure for computing the optimal variation of the blades' pitch angle of an H-Darrieus wind turbine that maximizes its torque at given operational conditions for a 7 kW prototype. They stated that a gain of almost 30% in the annual energy production was obtained with the polynomial optimal pitch control.…”

Section: Vawt (Blade Pitch-control Of Vertical-axis Wind Turbines)mentioning

confidence: 99%

New, Simple Blade-Pitch Control Mechanism for Small-Size, Horizontal-Axis Wind Turbines

Gawad¹

2013

JEPE

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Abstract:In the present research work, the pitch-control is carried out such that the rotor blades are rotated around their longitudinal axis while the rotor continues its normal rotation. It is really a challenge to produce a clever design to pitch the rotor blades by the optimal amount so as to maximize the power output at all wind speeds. The mechanism is implemented to a three-blade, horizontal-axis, home-scale wind turbine. The mechanism is powered by a suitable DC (direct-current) motor. The tests were carried out in the open section of a delivery wind tunnel. The air speed was measured by a suitable anemometer. The corresponding rotational speed (rpm) and output voltage at different wind speeds were measured and recorded for calibration of the control system. The mechanism proved to be successful in controlling the pitch angle over a wide range of wind speeds.

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“…Some studies for enhancing the performance of vertical axis tidal current turbine have been conducted previously by analytical, experimental and numerical methods [3][4][5][6][7][8][9]. Numerical method can be done by simulation using Computational Fluid Dynamics software [5][6][7]10].…”

Section: Introductionmentioning

confidence: 99%

The influence of time step setting on the CFD simulation result of vertical axis tidal current turbine

Satrio¹,

Utama²,

Mukhtasor³

2018

J. MECH. ENG. SCI.

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This paper investigates the influence of time step setting on the CFD simulation result of vertical axis tidal current turbine. Two main features of time step setting have been studied. The first feature concerns with time step size setting that representing the detailed calculation on each degree in one turbine rotation. The second feature deals with number of time step setting that representing how many turbine rotations need for achieving steadiness results. In this study, two-dimensional (2D) analysis of Computational Fluid Dynamics (CFD) simulation using ANSYS-Fluent code with Sliding Mesh technique is used to solve the incompressible Unsteady ReynoldsAveraged Navier-Stokes equations. The finite volume discretization method with second-order scheme and the SIMPLE algorithm are used for all transport equations. The steadiness calculation result is achieved at six turbine rotations and the rest has no significant effect.

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H-Darrieus Wind Turbine with Blade Pitch Control

Cited by 141 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

New, Simple Blade-Pitch Control Mechanism for Small-Size, Horizontal-Axis Wind Turbines

The influence of time step setting on the CFD simulation result of vertical axis tidal current turbine

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