CFD Prediction of Wind Turbine Blade Compressible Aerodynamics

Mezzacapo, A.; Vitulano, M. C.; Tomasso, A. D.; De Stefano, G.

doi:10.1007/978-3-031-36805-9_8

Lecture Notes in Computer Science

2023

DOI: 10.1007/978-3-031-36805-9_8

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CFD Prediction of Wind Turbine Blade Compressible Aerodynamics

A. Mezzacapo,

M. C. Vitulano,

A. D. Tomasso

et al.

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2024

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“…Their analysis shows that the compressible flow simulation overestimated the thrust value by 1.4% against the incompressible simulation, with the predicted torque being nearly 11% higher. A similar analysis of the compressible aerodynamics of the IEA-15MW RWT was carried out by Mezzacapo et al (2023) employing the Unsteady Reynolds-Averaged Navier-Stokes (URANS) approach. This work confirmed that URANS calculations can provide a preliminary insight into the aerodynamic behaviour of wind turbine blades in the compressible regime.…”

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confidence: 99%

Numerical Analysis of Transonic Flow over the FFA-W3-211 Wind Turbine Tip Airfoil

Vitulano,

De Tavernier,

De Stefano

et al. 2024

Preprint

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Abstract. Modern wind turbines are the largest rotating machines ever built, with blade lengths exceeding one hundred meters. Previous studies demonstrated how the flow around the tip airfoils of such large machines reaches local flow Mach numbers (Ma) at which the incompressibility assumption might be violated, and, even in normal operating conditions, local supersonic flow could appear. In the present study, a numerical analysis of the FFA-W3-211 wind turbine tip airfoil is performed. The results are obtained by means of the application of numerical tools: (1) Xfoil with the Prandtl-Glauert compressible correction and (2) Computational Fluid Dynamic (CFD) simulations, where an Unsteady Reynolds-Averaged Navier-Stokes (URANS) model is used. A preliminary validation of the latter CFD model is performed to demonstrate that the URANS approach is a viable method for predicting the aerodynamic performances in compressible and transonic flow that provides additional and more reliable information compared to the classical compressibility corrections. From this study, three key findings can be highlighted. Primarily, the main transonic features of the FFA-W3-211 wind turbine tip airfoil have been assessed, selecting specific test cases of particular industrial interest. Then, the threshold between subsonic and supersonic flow is provided, considering also an increase of the Reynolds number (Re) from a characteristic value used in the wind tunnel experiments to the one realistic for large rotors. A strong dependence on this quantity is observed, revealing that, for the same Mach number, also the Reynolds number plays a crucial role in promoting the occurrence of transonic flow. Finally, the possible presence or absence of shock waves was investigated. The results indicate that the appearance of transonic flow is a necessary but not a sufficient condition to lead to shock formation.

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confidence: 99%

Numerical Analysis of Transonic Flow over the FFA-W3-211 Wind Turbine Tip Airfoil

Vitulano,

De Tavernier,

De Stefano

et al. 2024

Preprint

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CFD Prediction of Wind Turbine Blade Compressible Aerodynamics

Cited by 1 publication

References 19 publications

Numerical Analysis of Transonic Flow over the FFA-W3-211 Wind Turbine Tip Airfoil

Numerical Analysis of Transonic Flow over the FFA-W3-211 Wind Turbine Tip Airfoil

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