Numerical Investigation of a Model Wind Turbine

Fischer, Annette; Flamm, Amélie; Jost, Eva; Lutz, Thorsten; Krämer, Ewald

doi:10.1007/978-3-319-64519-3_64

Cited by 3 publications

(6 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The differences between the FLOWer results with and without wind tunnel walls are larger than for the flapwise bending moment ( M x ≈ 33 % compared to M y < 20 %; see Table 13). This corresponds to the results of Fischer et al (2018) and Klein et al (2018), who also experienced a stronger influence of the walls on the power than on the thrust. The reason for this phenomenon is attributed to the different sensitivity of the forces to AoA variations.…”

Section: Investigation Of the Bending Momentssupporting

confidence: 88%

“…A comparison between the QBlade results and the FLOWer results under far field conditions verifies this assumption, as both the distributions and the offsets to the measured values, see Table 10, are almost similar. More information about this phenomenon and the underlying reasons can be found in Fischer et al (2018) and Klein et al (2018). The small kinks at ≈ 90 and ≈ 270 • azimuth in the QBlade results are a result of the usage of the tower model.…”

Section: Evaluation Of the Angle Of Attackmentioning

confidence: 87%

“…For a one-third model a grid convergence index study according to Celik et al 2008was already performed (Fischer et al, 2018). The extrapolated relative errors between the appropriate grids and the extrapolated values of a theoretical ideal mesh, which were determined in the course of this investigation, amount to 0.63 % for power and 0.02 % for thrust.…”

Section: Numerical Setup Of Flowermentioning

confidence: 95%

“…It is assumed that the presence of the installation leads to higher camber and therefore a higher local lift. Nonetheless, the installation of multihole probes is a common practice on research turbines; see Castaignet et al (2014), Gallant and Johnson (2016) and Pedersen et al (2017). The strain gauges for the determination of the blade root bending moments are glued on the bolt, Fig.…”

Section: Bladesmentioning

confidence: 99%

“…They found that for the operation of the wind turbine close to or above the optimal tip speed ratio, even blockage ratios which are larger than 5 % will have a substantial impact on the turbine performance. Fischer et al (2018) performed unsteady Reynoldsaveraged Navier-Stokes (URANS) simulations of a model wind turbine in a cylindrically shaped wind tunnel. To save computational time, the rotational symmetry of the turbine was exploited and only one-third of the rotor was simulated.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

About the suitability of different numerical methods to reproduce model wind turbine measurements in a wind tunnel with a high blockage ratio

et al. 2018

Self Cite

View full text Add to dashboard Cite

Abstract. In the present paper, numerical and experimental investigations of a model wind turbine with a diameter of 3.0 m are described. The study has three objectives. The first one is the provision of validation data. The second one is to estimate the influence of the wind tunnel walls by comparing measurements to simulated results with and without wind tunnel walls. The last objective is the comparison and evaluation of methods of high fidelity, namely computational fluid dynamics, and medium fidelity, namely lifting-line free vortex wake. The experiments were carried out in the large wind tunnel of the TU Berlin where a blockage ratio of 40 % occurs. With the lifting-line free vortex wake code QBlade, the turbine was simulated under far field conditions at the TU Berlin. Unsteady Reynolds-averaged Navier–Stokes simulations of the wind turbine, including wind tunnel walls and under far field conditions, were performed at the University of Stuttgart with the computational fluid dynamics code FLOWer. Comparisons among the experiment, the lifting-line free vortex wake code and the computational fluid dynamics code include on-blade velocity and angle of attack. Comparisons of flow fields are drawn between the experiment and the computational fluid dynamics code. Bending moments are compared among the simulations. A good accordance was achieved for the on-blade velocity and the angle of attack, whereas deviations occur for the flow fields and the bending moments.

show abstract

Section: Investigation Of the Bending Momentssupporting

confidence: 88%

Section: Evaluation Of the Angle Of Attackmentioning

confidence: 87%

Section: Numerical Setup Of Flowermentioning

confidence: 95%

Section: Bladesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

About the suitability of different numerical methods to reproduce model wind turbine measurements in a wind tunnel with a high blockage ratio

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

About the Influence of Wind Tunnel Walls, Tower and Nozzle on the Performance of a Model Wind Turbine

Klein

Zabel

Lutz

et al. 2018

High Performance Computing in Science and Engineering ' 17

View full text Add to dashboard Cite

Rotational and blockage effects on a wind turbine model based on local blade forces

Soto‐Valle

Gualtieri

Bartholomay

et al. 2022

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

This paper describes the results of an extended experimental campaign, reporting surface pressure measurement over one of the blades of the Berlin Research Turbine (BeRT), placed in a closed-loop wind tunnel facility. BeRT is a three-bladed horizontal axis wind turbine with a 3m rotor diameter. The focus is, on the one side, on the three-dimensional effects experienced by the rotating blade, in comparison to 2D approaches by means of XFoil simulations and 2D blade section experiments. On the other side, the blockage effects are investigated between the wind turbine model, placed in the wind tunnel where a 40% blockage ratio is produced, and lifting line free vortex wake simulations, where wind tunnel walls are not considered. Additionally, CFD computations are added in the comparison, with simulations of the far-field and with the wind tunnel walls. The turbine model is studied at several operational conditions such as different blade pitch angles and turbine yaw misalignments. Results are presented in terms of local force components derived from the surface pressure measurements. It is shown that rotational augmentation is evident at the blade mid-span location despite the large blockage. Additionally, the blockage is noticed by means of an offset in both normal and tangential local forces conserving trends and features under axial inflow and yaw misalignments. It is found that the offset in forces can be counteracted by pitching the blades.

show abstract

Numerical Investigation of a Model Wind Turbine

Cited by 3 publications

References 15 publications

About the suitability of different numerical methods to reproduce model wind turbine measurements in a wind tunnel with a high blockage ratio

About the suitability of different numerical methods to reproduce model wind turbine measurements in a wind tunnel with a high blockage ratio

About the Influence of Wind Tunnel Walls, Tower and Nozzle on the Performance of a Model Wind Turbine

Rotational and blockage effects on a wind turbine model based on local blade forces

Contact Info

Product

Resources

About