On the importance of the root-to-hub adapter effects on HAWT performance: A CFD-BEM numerical investigation

Mauro, Stefano; Lanzafame, R.; Messina, Michele; Brusca, S.

doi:10.1016/j.energy.2023.127456

Cited by 5 publications

(6 citation statements)

References 24 publications

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“…For the same reason, no further corrections are applied as the 3D physics of the sections is already contained in the axial and tangential CFD forces used in the procedure. More details can be found in [21,24] where the methodology has been validated on the NREL Phase VI rotor. Since the procedure applied was the same for both the rotors, only specific details about the CFD model implementation of the Phase II turbine are presented hereinafter.…”

Section: Methodsmentioning

confidence: 99%

“…This number of sections was found to be a good compromise after a sensitivity study [21]. All the insights about the Phase VI rotor are available in [21,24]. Instead, Geometrical detail comparisons of the rotors are pointed out in the next section.…”

Section: Methodsmentioning

confidence: 99%

“…The methodology used for the implementation of the CFD 3D model of the Phase II rotor was approximately the same as that reported in references [21,24] for the Phase VI, since the operating conditions and the dimensions of the turbines were the same. The entire CFD process was developed using Ansys 2023R1 CFD tools.…”

Section: Phase II Cfd Model Detailsmentioning

confidence: 99%

“…These boundary layer controls allowed to keep y + < 1 on all the blade and for all the operating conditions. The last-ratio represented the best inflation algorithm compromise since it provided the possibility to control both the first height of the prism layers and a smooth transition of the cell dimensions toward the edge of the prism layers therefore The Ansys Fluent solver settings were the same available in references [21,24]. The steady state, pressure-based solver with the moving reference frame (MRF) approach for rotation applied to the MRF region highlighted in Fig.…”

Section: Figure 4 Phase II Cfd Domain and Boundary Type Definitionsmentioning

confidence: 99%

“…The most important parameters were Csep, which optimized the flow separation from smooth surfaces, and Cmix, which optimized the strength of mixing in free shear flows. The calibration of Csep and Cmix was carried out according to the reference [24]. Also, since the chord Reynolds number was mostly below 1 million for all the operating conditions, the laminar to turbulent boundary layer transition was taken into account by using the GEKO option to add the intermittency transport equation.…”

Section: Figure 4 Phase II Cfd Domain and Boundary Type Definitionsmentioning

confidence: 99%

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On the influence of twist and taper of HAWT blades on the rotational augmentation phenomenon: the NREL Phase VI – Phase II comparison

Mauro,

Lanzafame,

Messina

et al. 2023

J. Phys.: Conf. Ser.

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The physics of 3D flows on rotating blades is currently one of the most important research fields related to wind turbines. Although many authors have studied the phenomenon thoroughly and they have proposed meaningful physical explanation of the mechanism which triggers the onset of the rotational augmentation, a universal correlation between rotor geometry, operating conditions and centrifugal pumping effects has not been derived yet. For instance, all the proposed corrections for rotational stall delay within 1D codes have demonstrated fairly good accuracy but in limited operating range or for specific airfoils or rotor geometries. In the present work the authors applied a consolidated methodology, based on the use of accurate CFD 3D models and of an inverse BEM code, to thoroughly analyze the differences in terms of rotational augmentation effects between the two widely known NREL Phase VI and Phase II HAWTs. This choice was made precisely since both the rotors used the S809 airfoil for the active part of the blade, had equal radial dimensions and the operating conditions were approximately the same. Thus, the substantial difference between the rotors was the fact that the Phase VI blade was twisted and tapered while the Phase II one had constant chord and pitch along the radial direction. In this way, the possible influence due to the twist and taper of the blade on the physics of the centrifugal pumping could be highlighted more easily. The CFD models were developed in Ansys Fluent and validated against experimental measurements available in the literature. The inverse BEM code, already implemented in a previous work, allowed the authors to extrapolate and compare sectional data obtained through the CFD simulations. The post-processing of the results demonstrated the strong influence of the twist and taper of the blade on the dynamics of the rotational augmentation. These results lead the way for a better understanding of the relation between rotor geometry and centrifugal pumping physics.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Phase II Cfd Model Detailsmentioning

confidence: 99%

Section: Figure 4 Phase II Cfd Domain and Boundary Type Definitionsmentioning

confidence: 99%

Section: Figure 4 Phase II Cfd Domain and Boundary Type Definitionsmentioning

confidence: 99%

See 3 more Smart Citations

On the influence of twist and taper of HAWT blades on the rotational augmentation phenomenon: the NREL Phase VI – Phase II comparison

Mauro,

Lanzafame,

Messina

et al. 2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

show abstract

Detailed CFD-BEM analysis about the effects of twist and taper of HAWTs on the rotational augmentation phenomenon

Mauro,

Lanzafame,

Messina

2025

Energy

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Prediction of heat transfer for a single round jet impingement using the GEKO turbulence model

Yüksekdağ,

Koçak,

Şentürk

2024

International Journal of Heat and Fluid Flow

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On the importance of the root-to-hub adapter effects on HAWT performance: A CFD-BEM numerical investigation

Cited by 5 publications

References 24 publications

On the influence of twist and taper of HAWT blades on the rotational augmentation phenomenon: the NREL Phase VI – Phase II comparison

On the influence of twist and taper of HAWT blades on the rotational augmentation phenomenon: the NREL Phase VI – Phase II comparison

Detailed CFD-BEM analysis about the effects of twist and taper of HAWTs on the rotational augmentation phenomenon

Prediction of heat transfer for a single round jet impingement using the GEKO turbulence model

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