3D CFD Modeling and Simulation of NREL Phase VI Rotor

Mahu, Razvan; Popescu, Florin; Frunzulică, Florin; Dumitrache, Al.

doi:10.1063/1.3637914

Cited by 3 publications

(3 citation statements)

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“…The deviation at 9c downstream slightly increases at the AOA of 22°( Figure 16F). This is associated with the stall state of the blade section and the corresponding reduced accuracy of the CFD for high AOAs (Mahu et al, 2011). However, the VG parametric model is used to predict the aerodynamic characteristics of the blade in a non-stall state, and the accuracy loss of the model when the blade is in stall is acceptable.…”

Section: Boundary Layer Velocity Profilementioning

confidence: 99%

Research on the Parametric Modelling Approach of Vortex Generator on Wind Turbine Airfoil

et al. 2021

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Counter-rotating vortex generators (VGs) are typically employed to delay airflow separation on wind turbine blades. Large-size wind turbine blades equipped with small size VGs make the computational fluid dynamics (CFD) researches require a great deal of computational resources. Parametric models of VGs can effectively improve the numerical research efficiency of wind turbine blades with VGs. In order to improve the accuracy of such parametric models, this study proposed a series of modeling approaches to determine the positions of the adding source term in Cartesian coordinates, the VG vortex core radius, etc., on the wind turbine airfoils. These techniques are integrated with a maximum circulation algorithm by considering the interactions between VG pairs to predict the performance of a DU91-W2-250 blade section with VGs. The proposed parametric model and an entity model at different angles of attack (AoAs) are implemented on the blade section. Our approach is validated using experimental data. Comparisons demonstrate a strong agreement between the modelled and experimental results, proving the high accuracy of the two models. The numerical results of the models are then compared and analyzed at different incoming flow velocities and AoAs to verify the universality of the proposed parametric approaches. The results reveal a high consistency between the vortex structure, the velocity profile above the blade surface and the distribution of the pressure coefficient calculated by the two models. This proves the high universality of the proposed approaches and demonstrates the potential of the parametric model in replacing the VG entity model. The VG parametric model expresses VG parameters by program, which can improve the research efficiency of VG arrangement on wind turbine blades.

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Section: Boundary Layer Velocity Profilementioning

confidence: 99%

Research on the Parametric Modelling Approach of Vortex Generator on Wind Turbine Airfoil

et al. 2021

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“…A sliding interface is used in this paper and generally applied in literature, to address the effect of the full rotating wind turbine. The extensive measurements were studied by different computational researchers using a variety of computational methods and grid topologies [7,[13][14][15][16]. In recent years, many efforts have been directed towards raising the fidelity of numerical modeling in predicting the complex flow behavior around wind turbines.…”

Section: Introductionmentioning

confidence: 99%

A Validation Study of the Aerodynamic Behaviour of a Wind Turbine: Three-Dimensional Rotational Case

Qaissi

Elsayed

Faqir

et al. 2021

CFDL

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Numerical modelling and simulation of a rotating, tapered, and twisted three-dimensional blade with turbulent inflow conditions and separating flows is a challenging case in Computational Fluid Dynamics (CFD). The numerical simulation of the fluid flow behaviour over a wind turbine blade is important for the design of efficient machines. This paper presents a numerical validation study using the experimental data collected by the National Renewable Energy Laboratory (NREL). All the simulations are performed on the sequence S of the extensive experimental sequences conducted at the NASA/Ames wind tunnel with constant RPM and variable wind speeds. The results show close agreement with the NREL UAE experimental data. The CFD model captures closely the totality of the defining quantities. The shaft torque is well-predicted pre-stall but under-predicted in the stall region. The three-dimensional flow and stall are well captured and demonstrated in this paper. Results show attached flow in the pre-stall region. The separation appears at a wind speed of 10 m/s near the blade root. For V>10m/s, the blade appears to experience a deep stall from root to tip.

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“…3D CFD simulations of different wind turbines, e.g. conducted by Laursen et al [3] or Mahu et al [4], yield a fairly well suited performance prediction. However, they showed that using transition turbulence models seem to result in an overprediction of integral values like the generated torque at the hub.…”

Section: Introductionmentioning

confidence: 99%

Small Horizontal Axis Wind Turbine: Analytical Blade Design and Comparison With RANS-Prediction and First Experimental Data

Gerhard

Sturm

Carolus

2013

Volume 8: Supercritical CO2 Power Cycles; Wind Energy; Honors and Awards

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State-of-the-art wind turbine performance prediction is mainly based on semi-analytical models, incorporating blade element momentum (BEM) analysis and empirical models. Full numerical simulation methods can yield the performance of a wind turbine without empirical assumptions. Inherent difficulties are the large computational domain required to capture all effects of the unbounded ambient flow field and the fact that the boundary layer on the blade may be transitional. A modified turbine design method in terms of the velocity triangles, Euler’s turbine equation and BEM is developed. Lift and drag coefficients are obtained from XFOIL, an open source 2D design and analysis tool for subcritical airfoils. A 3 m diameter horizontal axis wind turbine rotor was designed and manufactured. The flow field is predicted by means of a Reynolds-averaged Navier-Stokes simulation. Two turbulence models were utilized: (i) a standard k-ω-SST model, (ii) a laminar/turbulent transition model. The manufactured turbine is placed on the rooftop of the University of Siegen. Three wind anemometers and wind direction sensors are arranged around the turbine. The torque is derived from electric power and the rotational speed via a calibrated grid-connected generator. The agreement between the analytically and CFD-predicted kinematic quantities up- and downstream of the rotor disc is quite satisfactory. However, the blade section drag to lift ratio and hence the power coefficient vary with the turbulence model chosen. Moreover, the experimentally determined power coefficient is considerably lower as predicted by all methods. However, this conclusion is somewhat preliminary since the existing experimental data set needs to be extended.

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3D CFD Modeling and Simulation of NREL Phase VI Rotor

Cited by 3 publications

References 0 publications

Research on the Parametric Modelling Approach of Vortex Generator on Wind Turbine Airfoil

Research on the Parametric Modelling Approach of Vortex Generator on Wind Turbine Airfoil

A Validation Study of the Aerodynamic Behaviour of a Wind Turbine: Three-Dimensional Rotational Case

Small Horizontal Axis Wind Turbine: Analytical Blade Design and Comparison With RANS-Prediction and First Experimental Data

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