Unsteady Navier-Stokes studies on loads, wake, and dynamic stall characteristics of a two-bladed vertical axis wind turbine

Bangga, Galih; Lutz, Thorsten; Dessoky, Amgad; Krämer, Ewald

doi:10.1063/1.5003772

“…The increased fossil fuel depletion in past decades has led to a shortage in electricity production causing an increasing need in finding alternatives to fossil energy sources [1]. Wind energy has been identified as one of the most promising sources for renewable energy industry [2,3]. There are two main categories of wind turbines according to its rotational axis: Horizontal Axis Wind Turbines (HAWTs) and Vertical Axis Wind Turbines (VAWTs).…”

Section: Motivation and State Of The Artmentioning

confidence: 99%

Comparison of Blade Element Method and CFD Simulations of a 10 MW Wind Turbine

Bangga¹

2018

Preprint

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The present studies deliver the computational investigations of a 10 MW turbine with a diameter of 205.8 m developed within the framework of the AVATAR (Advanced Aerodynamic Tools for Large Rotors) project. The simulations were carried out using two methods with different fidelity levels, namely the computational fluid dynamics (CFD) and blade element and momentum (BEM) approaches. For this purpose, a new BEM code namely B-GO was developed employing several correction terms and three different polar and spatial interpolation options. Several flow conditions were considered in the simulations, ranging from the design condition to the off-design condition where massive flow separation takes place, challenging the validity of the BEM approach. An excellent agreement is obtained between the BEM computations and the 3D CFD results for all blade regions, even when massive flow separation occurs on the blade inboard area. The results demonstrate that the selection of the polar data can influence the accuracy of the BEM results significantly, where the 3D polar datasets extracted from the CFD simulations are considered the best. The BEM prediction depends on the interpolation order and the blade segment discretization.

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“…Increasing the angle of attack will modify the pressure distribution on the upper surface. This continues till separation of flow occurs [34][35], which is believed responsible for inducing noise emissions [36]. Uneven distribution of pressure on both surfaces of the airfoil considerably modifies the drag, lift and moment coefficient of the airfoil.…”

Section: Performance Of Savonius-darrieus Integrating Wind Turbinementioning

confidence: 99%

A Computational Fluid Dynamics Study of an Integrating Savonius-Darrieus Vertical Axis Wind Turbine

Mahrous

¹

2020

ARFMTS

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To combine the advantages of performance of both Savonius and Darrieus wind turbines, this paper aims to study computationally a novel design configuration of a Vertical Axis Wind Turbine (VAWT). The new design would help cover a broad range of performance parameters between both types of wind turbines as well as overcome drawbacks of the Savonius type at higher rotational speed. The proposed design is to integrate both of Savonius and straight blade Darrieus wind turbines in a single VAWT design configuration. In this design, the turbine rotor consists of a number of similar NACA0015 airfoil blades set in a particular arrangement. By regulating individual angles of rotor blades, the turbine would work as either Savonius or H-Darrieus VAWT. The turbine could also be set to work at different configurations between those for the Savonius and H-Darrieus ones. The computational results revealed that the performance of the proposed integrating wind turbine would be controlled and optimized to cover the operating range of both of Savonius and Darrieus wind turbines. Besides, the performance of Savonius VAWT would be modified when applying this design. When the proposed design is practically implemented, characteristics of both of Savonius and H-Darrieus based wind turbines would be found in a single design.

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“…The increased fossil fuel depletion in past decades has led to a shortage in electricity production causing an increasing need to find alternatives to fossil energy sources [1]. Wind energy has been identified as one of the most promising sources for the renewable energy industry [2,3]. There are two main categories of wind turbines according to its rotational axis: Horizontal Axis Wind Turbines (HAWTs) and Vertical Axis Wind Turbines (VAWTs).…”

Section: Motivation and State Of The Artmentioning

confidence: 99%

Comparison of Blade Element Method and CFD Simulations of a 10 MW Wind Turbine

Bangga

¹

2018

Fluids

Self Cite

View full text Add to dashboard Cite

The present studies deliver the computational investigations of a 10 MW turbine with a diameter of 205.8 m developed within the framework of the AVATAR (Advanced Aerodynamic Tools for Large Rotors) project. The simulations were carried out using two methods with different fidelity levels, namely the computational fluid dynamics (CFD) and blade element and momentum (BEM) approaches. For this purpose, a new BEM code namely B-GO was developed employing several correction terms and three different polar and spatial interpolation options. Several flow conditions were considered in the simulations, ranging from the design condition to the off-design condition where massive flow separation takes place, challenging the validity of the BEM approach. An excellent agreement is obtained between the BEM computations and the 3D CFD results for all blade regions, even when massive flow separation occurs on the blade inboard area. The results demonstrate that the selection of the polar data can influence the accuracy of the BEM results significantly, where the 3D polar datasets extracted from the CFD simulations are considered the best. The BEM prediction depends on the interpolation order and the blade segment discretization.

show abstract

Unsteady Navier-Stokes studies on loads, wake, and dynamic stall characteristics of a two-bladed vertical axis wind turbine

Cited by 31 publications

References 26 publications

Comparison of Blade Element Method and CFD Simulations of a 10 MW Wind Turbine

Comparison of Blade Element Method and CFD Simulations of a 10 MW Wind Turbine

A Computational Fluid Dynamics Study of an Integrating Savonius-Darrieus Vertical Axis Wind Turbine

Comparison of Blade Element Method and CFD Simulations of a 10 MW Wind Turbine

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