Experimental and Numerical Investigations of a Small Research Wind Turbine

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

“…The turbine data are summarized in Table 2 (Bartholomay et al, 2017;Pechlivanoglou et al, 2015;Vey et al, 2015).…”

Section: Berlin Research Turbine (Bert)mentioning

confidence: 99%

“…Data transmission between the two systems and the control computer is achieved by Wi-Fi connection. Further information on the setup is found in Vey et al (2015).…”

Section: Berlin Research Turbine (Bert)mentioning

confidence: 99%

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

“…In post-processing, coefficients of lift for both airfoils were compared and described as a polar curve to capture aerodynamic performance (Garrel, 2003;Snel et al, 2009). The polar curve for NACA-4415 at wind speed 5 m/s was used to predict rotor performance (Vey et al, 2015;Wendler et al, 2016) at 3 to 7 m/s. Curve fitting for the modified NACA-4415 airfoil followed the Montgomerie method, wherever the HAWT performance is predominantly determined by lift force, curve fitting was based on Cl of the polar curve.…”

Section: Methodsmentioning

confidence: 99%

Three-dimensional CFD Analysis of Performance of Small-scale Hawt based on Modified NACA-4415 Airfoil

Sudarsono¹,

Susastriawan²,

Sugianto³

2019

IJTech

View full text Add to dashboard Cite

The geometric of a wind turbine rotor is an important parameter in the development of a horizontal axis wind turbine (HAWT). Simulation can be used to determine the rotor's optimum geometry for specific wind speeds. The present study describes the three-dimensional (3D) computational fluid dynamics (CFD) simulation of a modified small-scale NACA-4415 HAWT rotor in order to predict power output and coefficient, using Blade Element Momentum (BEM) based on Lifting Line Theory (LLT). Power output and coefficient were analysed at wind speeds of 3, 4, 5, 6, and 7 m/s. The results predict that maximum power output increases with increasing wind speed. The predicted minimum power output of 35.41 Watt was obtained at wind speed 3 m/s and Tip Speed Ratio (TSR) 4; the predicted maximum power output was achieved at wind speed 7 m/s and TSR 6. As in the case of power output, power coefficient also improved with rising wind speed, with a coefficient of 0.259 at wind speed 3 m/s and TSR 4 and a coefficient of 0.449 at wind speed 7 m/s and TSR 5. Given Indonesia's typical wind speed of 4 to 5 m/s, this modified NACA-4415 rotor is predicted to generate between 92 and 255 Watts of power. The power output results show good agreement between simulation and experiment, with an R 2 value of 0.93.

show abstract

“…The LLFVW computations in this study are performed with the wind turbine design and simulation tool QBlade (Marten et al, 2010, which is developed at the Technical University of Berlin. The LLFVW algorithm is loosely based on the nonlinear lifting line formulation as described by Van Garrel (2003) and its implementation in QBlade is used to simulate both horizontal-axis wind turbine (HAWT) and vertical-axis wind turbine (VAWT) rotors. Rotor forces are evaluated on a blade element basis from tabulated lift and drag polar data.…”

Section: Numerical Methods Of Qbladementioning

confidence: 99%

Reply to the comments of Reviewer No. 1

Anonymous

2018

Preprint

View full text Add to dashboard Cite

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.Published by Copernicus Publications on behalf of the European Academy of Wind Energy e.V.

show abstract

Experimental and Numerical Investigations of a Small Research Wind Turbine

Cited by 18 publications

References 4 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

Three-dimensional CFD Analysis of Performance of Small-scale Hawt based on Modified NACA-4415 Airfoil

Reply to the comments of Reviewer No. 1

Contact Info

Product

Resources

About