Wind Turbine Aerodynamics from an Aerospace Perspective

Garrel, A. van; Pas, S. ten; Venner, Cornelis H.; Muijden, J. van

doi:10.2514/6.2018-0991

Cited by 20 publications

(30 citation statements)

References 23 publications

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“…This tool is an appealing alternative in the early stages of wind turbine design due to its simplicity of use and satisfactory accuracy provided at a lower computational cost than CFD tools. [18][19][20][21] A turbulent, viscous potential flow field around the wind turbine is resolved by QBlade. The Non-Linear Lifting Lines Free Vortex Wake (NLLFVW) method, in contrast to BEM techniques, relies on fewer assumptions and experimental corrections to resolve 3D flow structure around the blades.…”

Section: Methodsmentioning

confidence: 99%

Numerical investigation on the spanwise chord distribution effects on the performance of an H-darrieus vertical axis wind turbines

Souaissa,

Ghiss,

Bentaher

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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The efficiency of Darrieus wind turbines has increased significantly due to developments in blade design, albeit at the expense of the simplicity provided by simple straight blades. The purpose of this research is to gain insight into the influence of various curvatures embedded in the plan of the blade while maintaining its simple straight shape. A variation in chord length along the span defines the curvature. To assess their effect on performance and efficiency, concave, and convex Leading-Trailing Edged Blades (LTEB) are investigated and evaluated in comparison to straight blades. That is viable to gain valuable insight about these blade designs' potential advantages in various applications by studying their aerodynamic characteristics and flow characteristics. The Q-blade tool is used to simulate 3D unsteady Nonlinear Lifting Lines Free Vortex Wake (3D-NLLFVW). The virtual camber effect brought on by flow curvatures is implemented to improve the results' accuracy. According to the findings, H-Darrieus' aerodynamic efficiency climbed by 16% and 9.5% at high TSR. For the concave and convex LTEBs, the torque ripple is smoothed by 37% and 19%, respectively. Additionally, compared to the straight-bladed rotor, the chosen variations enable volume reductions of 53% and 28%.

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Section: Methodsmentioning

confidence: 99%

Numerical investigation on the spanwise chord distribution effects on the performance of an H-darrieus vertical axis wind turbines

Souaissa,

Ghiss,

Bentaher

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part A:

View full text Add to dashboard Cite

show abstract

“…Rotational effects were already included in the airfoil polar data thus no additional 3D correction was applied in AM. Snel's first-order model [11] was used to account for dynamic stall effects in both BEM and AWSM (AM's FVW model [12]) simulations. To compare with the experiment, the ensemble-averaged individual blade pitch and rotor speed time histories obtained from the wind tunnel measurements were prescribed in the simulations.…”

Section: Simulation Modelsmentioning

confidence: 99%

Investigation of the dynamic inflow effects due to collective and individual pitch steps on a wind tunnel setup

Langidis

Petrović

Mancini

et al. 2023

J. Phys.: Conf. Ser.

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Dynamic inflow effects occur due to the rapid change of the rotor loading under conditions such as fast pitch steps. The paper presents a setup suitable for the investigation of those effects for non-axisymmetric rotor conditions, namely individual pitch steps. Furthermore, insights into the relevant phenomena are gathered. An individual pitch control capable model wind turbine is set up in a wind tunnel in order to conduct measurement under controllable conditions. During the execution of the collective and individual pitch steps, the loads and the operational parameters are recorded by the onboard sensors. Meanwhile, simulations engineering aeroelastic codes are run in order to evaluate their accuracy for predicting the relevant phenomena. Results show distinct behaviour of the rotor loads during an individual pitch step, which differs from the loads under collective steps. The free vortex wake simulations are able to predict the turbines’ response satisfactory while the blade element momentum tools show deviations from the measurements. The findings serve as a basis for discussion and future work.

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“…The optimization technique that will be used to this end is Multi-objective Bayesian Optimization (MOBO). MOBO builds a probabilistic model of the objective function, where the objective function is the aerodynamic performance evaluated by the aerodynamic analysis tool, for which the lifting line code AWSM [11] is used. AWSM's free wake model is used where the wake length is set to three diameters.…”

Section: Optimization Setupmentioning

confidence: 99%

Vortex-model-based Multi-objective Optimization of Winglets for Wind Turbines using Machine Learning

Leenders

Gaunaa

et al. 2022

J. Phys.: Conf. Ser.

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Different Design Driving Load constraints (DDLs), are explored in this work to determine under which constraints and conditions a winglet can have an added value to the wind turbine blade design. Multi-objective Bayesian optimization is used to maximize the rotor’s power production while minimizing the flapwise DDLs. Surrogate models, created using machine learning techniques such as Gaussian Processes and Bayesian Neural Networks, are used in combination with an acquisition function, to determine what designs should be evaluated by the lifting line model AWSM, with the goal to obtain designs that lie on the Pareto front of two or more objectives. The recent Bayesian Neural Networks as surrogate model were able to find the Pareto-front most effectively in this work. Furthermore, the results show that different DDL constraints led to different winglet designs, with noticeable differences between upwind and downwind winglet designs. Winglet designs were found to be able to increase power without increasing the thrust, root flapwise bending moment and flapwise bending moment at radial locations on the blade. A noticeable increase in power was found when introducing sweep to the winglet design.

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Wind Turbine Aerodynamics from an Aerospace Perspective

Cited by 20 publications

References 23 publications

Numerical investigation on the spanwise chord distribution effects on the performance of an H-darrieus vertical axis wind turbines

Numerical investigation on the spanwise chord distribution effects on the performance of an H-darrieus vertical axis wind turbines

Investigation of the dynamic inflow effects due to collective and individual pitch steps on a wind tunnel setup

Vortex-model-based Multi-objective Optimization of Winglets for Wind Turbines using Machine Learning

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