CFD study of a vertical axis counter-rotating wind turbine

Ramos, D. Mikhail; Sauceda, C. Darnel

doi:10.1109/icrera.2017.8191273

Cited by 6 publications

(4 citation statements)

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“…Their counter-rotating movement increases the relative angular velocity of the DR-EG and decreases its size and weight. Another investigation in this area was carried out by Ramos et al [27], which concluded that the starting torque of a CR-VAWT with the DR-EG doubled that of a single VAWT. This improved the breaking inertia level and thus the self-starting capability of the turbine.…”

Section: Drivetrains For Cr-vawtmentioning

confidence: 99%

“…In this study, 3D Reynolds-averaged Navier-Stokes (RANS) simulation is integrated with the actuator line model (ALM) to study the working characteristics of the WT, for instance, the Cp(λ) characteristic. To best depict the physical processes that take place while the VAWT rotates, the k-ω shear stress transport (SST) turbulence model is implemented [27,47]. Dependencies, which are depicted in Figure 7, can be obtained either experimentally or with the use of CFD.…”

Section: Actuator Line Modeling For Vawt Simulationsmentioning

confidence: 99%

“…In a number of studies, the aerodynamic properties of CR-VAWTs of this type were compared with the corresponding properties of single-rotor VAWTs by both computer simulation and experimentally. In most cases, the CR-VAWTs consist of two identical Savonius rotors [26][27][28], but there are studies that use H-Darrieus rotors [17,19,29] or even a combination of these two types [30].…”

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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: Drivetrains For Cr-vawtmentioning

confidence: 99%

Section: Actuator Line Modeling For Vawt Simulationsmentioning

confidence: 99%

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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 order to achieve the most benefits from the wind energy resources, there is a need to develop and employ efficient wind turbine designs as a part of a sustainable energy mix in order to meet the growing energy demand. There is an increasing research interest in wind energy conversion and grid connections [3]- [7].…”

Section: Introductionmentioning

confidence: 99%