The Standard and Counter-Rotating VAWT Performances with LES

Dumitrescu, Horia; Dumiţrache, Alexandru; Mălăel, Ion; Bogateanu, Radu

doi:10.1007/978-3-030-11887-7_11

Cited by 2 publications

(2 citation statements)

References 7 publications

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“…In [24], both the starting behavior and power performance of a CR-VAWT with coaxial aerodynamically coupled rotors are outlined by comparing with an equivalent singlerotor VAWT by large eddy simulation (LES). The numerical results showed that the CR-VAWT offers self-start capabilities at a low tip-speed ratio (TSR) simultaneously with an improvement of the power coefficient at a high TSR.…”

Section: Cr-vawt With Co-axial Rotors When One Rotor Covers the Othermentioning

confidence: 99%

“…The numerical results showed that the CR-VAWT offers self-start capabilities at a low tip-speed ratio (TSR) simultaneously with an improvement of the power coefficient at a high TSR. The authors set "the effect of drag dynamic stall induced by successive flow-blade collisions" [24]. This effect provided an increase in power coefficient at a low TSR.…”

Section: Cr-vawt With Co-axial Rotors When One Rotor Covers the Othermentioning

confidence: 99%

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Design Features and Numerical Investigation of Counter-Rotating VAWT with Co-Axial Rotors Displaced from Each Other along the Axis of Rotation

et al. 2023

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In this paper, dual-rotor counter-rotating (CR) configurations of vertical axis wind turbines (VAWTs) are briefly inspected and divided into three types. This investigation was focused on one of these types—the CR-VAWT with co-axial rotors, in which two equal rotors are placed on the same shaft, displaced from each other along it and rotated in opposite directions. For this CR-VAWT with three-blade H-Darrieus rotors, the properties of the design in terms of aerodynamics, mechanical transmission and electric generator, as well as control system, are analyzed. A new direct-driven dual-rotor permanent magnet synchronous generator was proposed, in which two built-in low-power PM electric machines have been added. They perform two functions—starting-up and overclocking of the rotors to the angular velocity at which the lifting force of the blades is generated, and stabilizing the CR-VAWT work as wind gusts act on the two rotors. Detailed in this paper is the evaluation of the aerodynamic performance of the CR-VAWT via 3D computational fluid dynamics simulations. The evaluation was conducted using the CONVERGE CFD software with the inclusion of the actuator line model for the rotor aerodynamics, which significantly reduces the computational effort. Obtained results show that both rotors, while they rotate in opposite directions, had a positive impact on each other. At the optimal distance between the rotors of 0.3 from a rotor height, the power coefficients of the upper and lower rotors in the CR-VAWT increased, respectively, by 5.5% and 13.3% simultaneously with some increase in their optimal tip-speed ratio compared to the single-rotor VAWT.

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Section: Cr-vawt With Co-axial Rotors When One Rotor Covers the Othermentioning

confidence: 99%

Section: Cr-vawt With Co-axial Rotors When One Rotor Covers the Othermentioning

confidence: 99%

Design Features and Numerical Investigation of Counter-Rotating VAWT with Co-Axial Rotors Displaced from Each Other along the Axis of Rotation

et al. 2023

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Numerical Analysis of a Novel Vertical-Axis Wind Turbine Layout

PREDA,

DURAN,

PANDELE

et al. 2023

INMATEH

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Governmental incentives, technological progress, and lowering costs have made renewable energy more accessible and more affordable for residential areas. Switching to renewable energy sources not only reduces greenhouse gas emissions but also provides long-term financial gains, energy independence, and a cleaner environment for communities. In this study, a numerical analysis of a vertical-axis wind turbine layout that is easily adaptable to populated areas was conducted. Among the results are the variation of the torque coefficient during the course of a complete 360-degree rotation and the vorticity magnitude evolution at the nominal point. In order to validate the numerical results, a test campaign will be conducted inside the wind tunnel as part of further study. This campaign will be carried out using an experimental small-scale model.

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The Standard and Counter-Rotating VAWT Performances with LES

Cited by 2 publications

References 7 publications

Design Features and Numerical Investigation of Counter-Rotating VAWT with Co-Axial Rotors Displaced from Each Other along the Axis of Rotation

Design Features and Numerical Investigation of Counter-Rotating VAWT with Co-Axial Rotors Displaced from Each Other along the Axis of Rotation

Numerical Analysis of a Novel Vertical-Axis Wind Turbine Layout

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