Computational Fluid Dynamics Prediction of a Modified Savonius Wind Turbine with Novel Blade Shapes

Tian, Wenlong; Song, Baowei; VanZwieten, James H.; Pyakurel, Parakram

doi:10.3390/en8087915

Cited by 87 publications

(52 citation statements)

References 19 publications

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“…By adopting the O-grid generation technique [28], mesh refinement was generated near the blade surface to describe with sufficient precision the boundary layer flow, and the size of the first element in the wall-normal direction was fine enough to ensure y + < 5. This y + value made it suitable for the use of the enhanced wall function [29]. As a result of the thin twist blades with their highly complex shape of the FX93-2500 wind turbine, the difficulty and quantity of the structured mesh generation are greatly increased.…”

Section: Numerical Simulation Methods Based On Cfdmentioning

confidence: 99%

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Numerical Study of the Aerodynamic Loads on Offshore Wind Turbines under Typhoon with Full Wind Direction

2016

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Abstract:Super typhoon activity is likely to make the electric power network fail, or blow the wind-measuring device off, which all lead to the yaw control system of wind turbine being inactive. Under this condition, blades can be blown by the violent side wind from unfavorable directions, and the aerodynamic loads on the wind turbine will be increased by a large amount, which can lead to low-cycle fatigue damage and other catastrophic collapses. So far, not enough consideration has been given to the above problems in wind turbine design. Using the transient computational fluid dynamics (CFD), this study investigates the wind load characteristics of offshore wind turbines under typhoon condition with 360-degree full wind directions. Two primary influence factors of the aerodynamic characteristics of wind turbines are clarified: variation of the wind direction and different parking positions of the wind rotor. Using 3D-numerical simulation results, this study provides detailed references for the ultimate strength and fatigue life in wind turbine design, and presents the best parking position of the wind turbine with a free yawing strategy.

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Section: Numerical Simulation Methods Based On Cfdmentioning

confidence: 99%

“…The RNG k-ε turbulence model was adopted, which is widely used and has more data accumulation and considerable precision [29,35,36]. Additionally, the enhanced wall function was utilized to obtain the flow field characteristics in the wall region of the turbulent boundary layer.…”

Section: Numerical Simulation Methods Based On Cfdmentioning

confidence: 99%

Numerical Study of the Aerodynamic Loads on Offshore Wind Turbines under Typhoon with Full Wind Direction

2016

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“…Kacprzak et al studied the performance of modified turbines with spline-type and Bach-type blades, and an increment of 16% in the efficiency was found in the case of using spline-type blades [22]. Tian et al studied the performance of the Savonius turbine with new blades, including elliptical blades [23], and blades derived from the Myring Equation [24].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulations of a VAWT in the Wake of a Moving Car

Tian

Mao

2017

Energies

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Abstract:Wind energy generated from the wake of moving cars has a large energy potential that has not yet been utilized. In this study, a vertical axis wind turbine (VAWT) was used to recover energy from the wakes of moving cars. The turbine was designed to be planted by the side of the car lane and driven by the wake produced by the car. Transient computational fluid dynamics (CFD) simulations were performed to evaluate the performance of the VAWT. The influence of two main factors on the performance of the VAWT, the velocity of the car and the gap between the car and the rotor, were studied. The simulations confirmed the feasibility of this plan, and in the tested cases, the VAWT was able to generate a maximum energy output of 100.49 J from the wake of a car. The results also showed that the performance of the VAWT decreased with the velocity of the car, and the increased gap between the car and the VAWT.

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“…To predict the turbulence effects in the transient predictions, a standard two-equation k À e model was used, 20 which is based on the transport equations for the turbulence kinetic energy, k, and its dissipation rate, e. The standard k À e model has the advantages of robustness, economy, and reasonable accuracy, and is widely used and able to simulate many flow regimes:…”

Section: B Governing Equationsmentioning

confidence: 99%

“…17,18 As for the novel blades of the Savonius turbine, researchers have studied numerically the performance of the turbine with arc-type blades 19 and blades developed from Myring equations. 20 A numerical study was also carried out to investigate the interaction between multi-turbines. 21 Cooper and Kennedy developed a novel VAWT with actively pitched blades, called a Wollongong turbine.…”

Section: Introductionmentioning

confidence: 99%

Influence analysis of blade chord length on the performance of a four-bladed Wollongong wind turbine

Mao

Tian

Yan

2016

Journal of Renewable and Sustainable Energy

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The Wollongong wind turbine is a new kind of vertical axis wind turbine (VAWT) with its blades rotated by only 180° for each full revolution of the main rotor. A computational study on the effect of blade chord length on the turbine output performance of a four-bladed Wollongong turbine has been conducted using the commercial computational fluid dynamics (CFD) code ANSYS 13.0. A validation study was performed using a Savonius turbine and good agreement was obtained with experimental data. Both rotating and steady CFD simulations were conducted to investigate the performance of the VAWT. Rotating two-dimensional CFD simulations demonstrated that a turbine with a blade length of 550 mm has the highest power curve with a maximum averaged power coefficient of 0.3639, which is almost twice as high as that of a non-modified Savonius turbine. Steady two-dimensional CFD simulations indicated that the Wollongong turbine has a good self-starting capability with an averaged static torque coefficient of 1.09, which is about six times as high as that of a Savonius turbine.

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Computational Fluid Dynamics Prediction of a Modified Savonius Wind Turbine with Novel Blade Shapes

Cited by 87 publications

References 19 publications

Numerical Study of the Aerodynamic Loads on Offshore Wind Turbines under Typhoon with Full Wind Direction

Numerical Study of the Aerodynamic Loads on Offshore Wind Turbines under Typhoon with Full Wind Direction

Numerical Simulations of a VAWT in the Wake of a Moving Car

Influence analysis of blade chord length on the performance of a four-bladed Wollongong wind turbine

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