scholarly journals Analysis of winglets and sweep on wind turbine blades using a lifting line vortex particle method in complex inflow conditions

2018 ◽  
Vol 1037 ◽  
pp. 022021 ◽  
Author(s):  
Matias Sessarego ◽  
Néstor Ramos-García ◽  
Wen Zhong Shen
Keyword(s):  
Wind Turbine ◽  
Turbine Blades ◽  
Particle Method ◽  
Wind Turbine Blades ◽  
Line Vortex ◽  
Vortex Particle Method ◽  
Lifting Line ◽  
Inflow Conditions ◽  
Vortex Particle

Comparison of Mann Turbulence and atmospheric turbulence as inflow conditions on a wind turbine in large-eddy simulations (LES)

2021 ◽  
Author(s):  
Linus Wrba ◽  
Antonia Englberger
Keyword(s):  
Wind Turbine ◽  
Atmospheric Surface Layer ◽  
Turbine Blades ◽  
Potential Temperature ◽  
Large Eddy Simulations ◽  
Wind Turbine Blades ◽  
Large Eddy ◽  
The Impact ◽  
Inflow Conditions ◽  
Blade Element

<p>This study deals with different inflow conditions on wind-turbines in LES in order to analyse the impact on the wake. The wind turbine regarded in this study has a hub height of 57.19 m while the radius of the blade measures 40m. Furthermore, the blade element momentum method (BEM) is used to calculate the development forces of the wind turbine blades on the flow. First, the syntheticly generated turbulence of a Mann[1] box generator is considered. Second, atmospheric boundary layer simulations from Englberger and Dörnbrack (2018) are applied as inflow conditions for the three wind components and the potential temperature to calculate the wake of the wind turbine. The distribution of turbulent kinetic energy in eddys of different sizes is worked out in their energy spectrum.The inflow conditions represent the -5/3 Kolmogorov spectrum. The wake characteristics are evaluated for both inflow datasets and the arising differences are discussed in this study</p><div><br><div> <p>[1] Mann, J. (1994). The spatial structure of neutral atmospheric surface-layer turbulence. Journal of fluid mechanics 273</p> </div> </div><div><br><div> <p> </p> </div> </div>

scholarly journals Evaluation of different methods of determining the angle of attack on wind turbine blades under yawed inflow conditions

2018 ◽  
Vol 1037 ◽  
pp. 022028 ◽  
Author(s):  
K. Vimalakanthan ◽  
J.G Schepers ◽  
W.Z Shen ◽  
H. Rahimi ◽  
D. Micallef ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Turbine Blades ◽  
Angle Of Attack ◽  
Wind Turbine Blades ◽  
Inflow Conditions

scholarly journals Evaluation of different methods for determining the angle of attack on wind turbine blades with CFD results under axial inflow conditions

2018 ◽  
Vol 125 ◽  
pp. 866-876 ◽  
Author(s):  
H. Rahimi ◽  
J.G. Schepers ◽  
W.Z. Shen ◽  
N. Ramos García ◽  
M.S. Schneider ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Turbine Blades ◽  
Angle Of Attack ◽  
Wind Turbine Blades ◽  
Inflow Conditions

scholarly journals The Circulation Distribution on the Lifting Line for a Given Extracted Power

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Ali Helali ◽  
Badreddine Kamoun ◽  
David Afungchui ◽  
Mohamed Jomaa Safi
Keyword(s):  
Wind Turbine ◽  
Turbine Blades ◽  
Variational Problems ◽  
Wind Turbine Blades ◽  
Distribution Law ◽  
Horizontal Axis Wind Turbine ◽  
Circulation Distribution ◽  
Induced Velocity ◽  
Lifting Line ◽  
Extracted Power

Presently, there exist few numerical methods which treat the inverse problem for the determination of the geometry of wind turbine blades. In this work, authors intend to solve the inverse optimum project for horizontal axis wind turbine in which the selection of the circulation distribution is obtained by resolving two variational problems: the first consists in sorting the circulation distribution on the lifting line, which, for a given power extracted by the wind turbine, minimizes the loses due to the induced velocity. In the second, the optimal circulation distribution is selected such that the kinetic energy of the wind downstream of the rotor disc is minimum, when the energy extracted by the wind turbine for one rotating period is imposed. A code has been developed which incorporates the real pitch of the helicoidal vortex wake. Very promising results have been obtained: the circulation distribution for a given extracted power and the chord lengths distribution law along the blade span.

scholarly journals Hybrid Vortex Method for the Aerodynamic Analysis of Wind Turbine

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Hao Hu ◽  
Bo Gu ◽  
Hongtao Zhang ◽  
Xiancheng Song ◽  
Wanli Zhao
Keyword(s):  
Wind Turbine ◽  
Numerical Procedure ◽  
Particle Method ◽  
Vortex Method ◽  
Panel Method ◽  
Vortex Sheets ◽  
Flow Equations ◽  
Vortex Particle Method ◽  
Aerodynamic Parameters ◽  
Vortex Particle

The hybrid vortex method, in which vortex panel method is combined with the viscous-vortex particle method (HPVP), was established to model the wind turbine aerodynamic and relevant numerical procedure program was developed to solve flow equations. The panel method was used to calculate the blade surface vortex sheets and the vortex particle method was employed to simulate the blade wake vortices. As a result of numerical calculations on the flow over a wind turbine, the HPVP method shows significant advantages in accuracy and less computation resource consuming. The validation of the aerodynamic parameters against Phase VI wind turbine experimental data is performed, which shows reasonable agreement.

Experiments of Wind Turbine Blades with Rocket Triggered Lightning

2009 ◽  
Vol 129 (5) ◽  
pp. 689-695
Author(s):  
Masayuki Minowa ◽  
Shinichi Sumi ◽  
Masayasu Minami ◽  
Kenji Horii
Keyword(s):  
Wind Turbine ◽  
Turbine Blades ◽  
Wind Turbine Blades ◽  
Triggered Lightning
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