Performance Effects of Leading Edge Tubercles on the NREL Phase VI Wind Turbine Blade

Abate, Giada; Mavris, Dimitri N.; Sankar, Lakshmi N.

doi:10.1115/1.4042529

Cited by 20 publications

(15 citation statements)

References 19 publications

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“…Whereas Abate et al [9], and Lohry et al [11] results have an agreement with the study's optimum configuration, Hansen et al [3], and Paula et al [12] obtained a different optimum configuration of small amplitude and small wavelength.…”

Section: M39mentioning

confidence: 59%

“…Abate et al [9] tested the performance of wind turbines with different tubercles configurations and their effect on power and annual energy production. Abate et al [9] found a considerable improvement for all tubercles configurations in high wind speeds and stall conditions. At low speed, tubercles degraded the wind turbine performance.…”

Section: M22mentioning

confidence: 99%

“…At low speed, tubercles degraded the wind turbine performance. Abate et al [9] stated that tubercles generate counterrotating vortices that prevent spanwise flow. Ke et al [10] investigated the influence of wind velocity on a sinusoidal leadingedge wind turbine.…”

Section: M22mentioning

confidence: 99%

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An Investigation of the Dependence of 3D Semi-Span Wing Behaviour on the Leading-edge Tubercles Configuration

Abdelkader

Abdelsamie

Elsayed

2022

Engineering Research Journal

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Inspired by nature, experiments on the aerodynamic behavior of wings and wind turbines with sinusoidal leading-edge continued over the last two decades. The studies showed promising results at post-stall flow regimes as tubercles cause a more gradual lift loss and a higher stall angle of attack. This study aims to investigate numerically the dependence of the wing's aerodynamic coefficients on the tubercle's wavelength and amplitude at the stall angle of attack and 3D flow regime. The results show that increasing the tubercle's average amplitude up to 0.02 of the average chord increases the lift coefficient by 23.61% and decreases the drag coefficient by 4.61%. Similarly, decreasing the wavelength especially up to 1.1096 of the average chord increases the lift coefficient up to 21.55% and decreases the drag coefficient by 9.50%. Flow visualization shows that zones of attaching and separation flow form on the suction surface of the scalloped wings whereas the baseline wing is in a deep stall.

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Section: M39mentioning

confidence: 59%

Section: M22mentioning

confidence: 99%

See 1 more Smart Citation

An Investigation of the Dependence of 3D Semi-Span Wing Behaviour on the Leading-edge Tubercles Configuration

Abdelkader

Abdelsamie

Elsayed

2022

Engineering Research Journal

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show abstract

“…Although high wind speeds (more than 15 m/s) are often characterized by unsteady phenomena, the unsteady behavior of localized vortices has very little bearing on the overall aerodynamic performance of wind turbine blades [61]. The analysis is consequently conducted using stable Reynolds Averaged Navier-Stokes (RANS) Equations with the k-ω SST turbulence model, where convergence is obtained for all the simulations with an error of 10 −4 .…”

Section: Mesh Topology and Grid Independence Investigationmentioning

confidence: 99%

Aerodynamic Optimization of Trailing-Edge-Serrations for a Wind Turbine Blade Using Taguchi Modified Additive Model

Qaissi¹,

Elsayed²,

Faqir³

et al. 2023

Energies

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For the rotor, achieving relatively high aerodynamic performance in specific wind conditions is a long-term goal. Inspired by the remarkable flight characteristics of owls, an optimal trailing edge serration design is investigated and proposed for a wind turbine rotor blade. Fluid flow interaction with the proposed serrations is explored for different wind conditions. The result is supported by subsequent validation with three-dimensional numerical tools. The present work employs a statistical-numerical method to predict and optimize the shape of the serrations for maximum aerodynamic improvement. The optimal combination is found using the Taguchi method with three factors: Amplitude, wavelength, and serration thickness. The viability of the solution on an application is assessed using the Weibull distribution of wind in three selected regions. Results show that the presence of serration is capable of improving the annual power generation in all the investigated cities by up to 12%. The rated speed is also shifted from 10 m/s to 8 m/s for most configurations. Additionally, all configurations show similar trends for the instantaneous torque, where an increase is observed in pre-rated speed, whereas a decrease is noticed in the post-rated speed region. A look at the flow field pattern for the optimal design in comparison with the clean blade shows that the modified blade is able to generate more lift in the pre-stall region, while for the post-stall region, early separation and increased wake dominate the flow.

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“…In contrast, it is easier to realize the passive methods to change the characteristics of the main flow by adding auxiliary components on the external surface and mixing the airflow of the components with the main flow. For example, tip winglets [7][8][9][10], bionic leading edges [11][12][13], Gurney flaps [14][15][16], vortex generators [17][18][19][20][21][22][23][24], and other components have been added to the blades to improve the wind turbine's aerodynamic performance. Nobari et al [7] studied a wind turbine equipped with flat winglets by the finite volume method, and the wind turbine power increased by 16% after optimization.…”

Section: Introductionmentioning

confidence: 99%

A New Flow Control and Efficiency Enhancement Method for Horizontal Axis Wind Turbines Based on Segmented Prepositive Elliptical Wings

Bai,

Zhan,

2023

Aerospace

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Flow separation occurs when wind turbines operate under large inflow conditions, which seriously affects the utilization of wind energy and reduces the output power of the blade. Therefore, a composite flow control configuration for horizontal axis wind turbines, founded on segmented prepositive elliptical wings, is proposed for efficiency enhancement. Taking a typical NREL Phase VI wind turbine as the prototype, its separation effect is evaluated by the CFD method. Then, starting from the improvement of the two-dimensional airfoil flow, the prepositive elliptic wing is designed according to the airfoil flow, and the optimal two-dimensional flow control configuration of the blade airfoil is obtained by simulation analysis. Finally, the two-dimensional configuration is extended to three-dimensional, and the aerodynamic characteristics of the blade before and after flow control are simulated and compared. The results show that, at wind speeds of 10~20 m/s, flow separation on the blade is effectively inhibited; meanwhile, the pressure difference between the pressure surface and the suction surface increases. These characteristics greatly improve the performance of wind turbine and increase its torque by more than 30%. Moreover, when the flow control effect cannot be reached, the blade torque is only reduced by approximately 2%.

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Performance Effects of Leading Edge Tubercles on the NREL Phase VI Wind Turbine Blade

Cited by 20 publications

References 19 publications

An Investigation of the Dependence of 3D Semi-Span Wing Behaviour on the Leading-edge Tubercles Configuration

An Investigation of the Dependence of 3D Semi-Span Wing Behaviour on the Leading-edge Tubercles Configuration

Aerodynamic Optimization of Trailing-Edge-Serrations for a Wind Turbine Blade Using Taguchi Modified Additive Model

A New Flow Control and Efficiency Enhancement Method for Horizontal Axis Wind Turbines Based on Segmented Prepositive Elliptical Wings

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