Numerical Simulation of Wind Turbine Scale Effects by Using CFD

Chang, Byeong-Hee; Cho, Tae-Hwan

doi:10.2514/6.2007-216

Cited by 6 publications

(7 citation statements)

References 2 publications

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“…Chamorro et al [8] suggested that stronger Reynolds number dependence occurs in the near wake region, while the main flow statistics become independent of Reynolds number starting from Re ≈ 9.3 × 10 4 . Park et al [9] showed that the power coefficient of a wind turbine is very sensitive to the change in the model scale, but the thrust coefficient is not. Ge et al [10] selected six airfoils and found they all exhibited better performance at a higher Reynolds number.…”

Section: Introductionmentioning

confidence: 99%

Wake Effect of a Horizontal Axis Wind Turbine on the Performance of a Downstream Turbine

et al. 2019

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This paper presents wind tunnel tests on the wake characteristics of a three-blade horizontal axis wind turbine and the wake effect on the performance of a downstream turbine. For a single turbine model, the performance was determined and this was followed by measurement of the wind characteristics including velocities, turbulence intensities, and correlation in the wake flow field. Subsequently, taking two horizontal axis wind turbines in a tandem arrangement into account, their performance was tested and the aerodynamic mechanism was discussed. The results showed that the upstream turbine with blades set at a small pitch angle provided smaller disturbance to the flow, but as the blade turned faster, larger changes in the velocity and the turbulence intensity occurred in its wake due to the more frequent disturbance of the wind turbine. The correlation of wake velocities in the turbine swept area also obviously decreased from the free-stream situation. For the downstream turbine, the output power loss largely depended on the wake characteristics of the upstream turbine, which was closely related to lower wind velocities or higher turbulence intensities. The decrease in correlation of the streamwise velocity within the blade swept area is accompanied by the increased correlation of the tangential velocity, which may be beneficial to the downstream turbine’s performance.

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Section: Introductionmentioning

confidence: 99%

Wake Effect of a Horizontal Axis Wind Turbine on the Performance of a Downstream Turbine

et al. 2019

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“…Numerical simulations of scale effect for NREL Phase VI were performed by CFD, and a method based on two dimensional airfoil analysis results was presented and applied to NREL Phase VI wind turbines for the correction of scale effect [98]. Sørensen et al [99] and Zahle et al [100,101] discussed the influence of wind shear and tower presence on rotor and wake aerodynamics by using CFD method.…”

Section: D Cfd Modelmentioning

confidence: 99%

Review of aeroelasticity for wind turbine: Current status, research focus and future perspectives

Zhang

Huang

2011

Front. Energy

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Aeroelasticity has become a critical issue for Multi-Megawatt wind turbine due to the longer and more flexible blade. In this paper, the development of aeroelasticity and aeroelastic codes for wind turbine is reviewed and the aeroelastic models for wind turbine blade are described, based on which, the current research focuses for large scale wind turbine are discussed, including instability problems for onshore and offshore wind turbines, effects of complex inflow, nonlinear effects of large blade deflection, smart structure technologies, and aerohydroelasticity. Finally, the future development of aeroelastic code for large scale wind turbine: aeroservoelasticity and smart rotor control; nonlinear aeroelasticity due to large blade deflection; full-scale 3D computational fluid dynamics (CFD) solution for dynamics; and aerohydroelasticity are presented.

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“…The performance of this turbine has been studied numerically in quite a bit of research, aiming to have an accurate prediction of nearfield flow. Park et al [6] carried out a CFD simulation on different sizes of NREL Phase VI wind turbine to investigate the performance of various sizes and study scale effect, using FLUENT software. They have found out that the results obtained by the realizable k-turbulence model have the best agreement with experimental as well as blind test data.…”

Section: Introductionmentioning

confidence: 99%

“…Jang and Joung [7] investigated the aerodynamic performance of NREL Phase VI wind turbine through performing 3D simulation. In this research, validation of torque produced by NREL Phase VI wind turbine was performed considering the results from [5][6][7]. Different studies have been carried out to predict the effect of having an auxiliary rotor on the performance of wind turbines.…”

Section: Introductionmentioning

confidence: 99%

Prediction of aeroacoustic performance of counter-rotating wind turbine by changing the rotational speed of front rotor

2019

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This study aims to investigate the aerodynamic and aeroacoustic performance of a counter-rotating wind turbine (CRWT) to define the effect of rotational wind speed of the front rotor on the sound pressure level of CRWT, using CFD simulation. For this purpose, NREL Phase VI wind turbine was considered as the single rotor, and validation of aerodynamic and aeroacoustic simulation has been carried out for the solver. Then, 3D simulation has been applied on single rotor and counter-rotating wind turbines to scrutinize the acoustic level of CRWT by changing the rotational speed of the front rotor. The unsteady flow simulation was carried out with the realizable k-ε Reynolds-averaged Navier-Stokes turbulence model, and the calculated flow field data were utilized using Ffowcs Williams-Hawkings model for predicting the acoustic level at receiver location, defined based on the IEC61400-11 standard. The results show that increasing the rotational wind speed of the upstream rotor leads to augmenting the noise emitted from CRWT. On the other hand, for tip speed ratios (TSR) ranging from 6 to 12, with increasing the front rotor RPM, the power coefficient of CRWT enhances, while for the TSR more than 12, an inverse behavior has been observed and power coefficient declines along with increasing front rotor's speed of revolution.

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Numerical Simulation of Wind Turbine Scale Effects by Using CFD

Cited by 6 publications

References 2 publications

Wake Effect of a Horizontal Axis Wind Turbine on the Performance of a Downstream Turbine

Wake Effect of a Horizontal Axis Wind Turbine on the Performance of a Downstream Turbine

Review of aeroelasticity for wind turbine: Current status, research focus and future perspectives

Prediction of aeroacoustic performance of counter-rotating wind turbine by changing the rotational speed of front rotor

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