scholarly journals Numerical investigations of a novel vertical axis wind turbine using Blade Element Theory‐Vortex Filament Method ( BET ‐ VFM )

2019 ◽  
Vol 7 (6) ◽  
pp. 2498-2509 ◽  
Author(s):  
Doma Hilewit ◽  
Edgar Matida ◽  
Amin Fereidooni ◽  
Hamza Abo el Ella ◽  
Fred Nitzsche
Keyword(s):  
Wind Turbine ◽  
Vertical Axis ◽  
Vortex Filament ◽  
Vertical Axis Wind Turbine ◽  
Numerical Investigations ◽  
Blade Element Theory ◽  
Element Theory ◽  
Vortex Filament Method ◽  
Blade Element

Study on Performance Promotion of Lift Type Wind Turbine

2014 ◽  
Vol 1070-1072 ◽  
pp. 1879-1882
Author(s):  
Zhen Zhou Zhao ◽  
Tong Guang Wang ◽  
Jing Ru Chen ◽  
Bo Feng Xu
Keyword(s):  
Wind Turbine ◽  
Air Flow ◽  
Vertical Axis ◽  
Azimuth Angle ◽  
Attack Angle ◽  
Vertical Axis Wind Turbine ◽  
Stream Tubes ◽  
Blade Element

In order to increase the performance of lift-type wind turbine, at the minimal torque value area, two interfere air flow is used to rebuilding the air flow. Based on multiply stream-tubes model, the effect of interfere air on promotion performance of blade element are studied. the results prove the interfere air method does greatly arise the torque, the attack angle of blade element at 0°~15 and 165°~180°azimuth angle, and promote the torque of single blade wind turbine with two or three blades. The paper provides a new way for vertical axis wind turbine designing and application.

Multi-Fidelity Aerodynamic Modeling of a Floating Offshore Wind Turbine Rotor

2020 ◽  
Author(s):  
Kai Zhang ◽  
Onur Bilgen
Keyword(s):  
Wind Turbine ◽  
Turbine Rotor ◽  
Modeling Method ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Blade Element Theory ◽  
Momentum Theory ◽  
Element Theory ◽  
Wind Turbine Rotor ◽  
Blade Element

Abstract This paper presents a comparison of low- and mid-fidelity aerodynamic modelling of floating offshore wind turbine rotors. The low-fidelity approach employs the conventional Blade Element Momentum theory implemented in AeroDyn of OpenFAST. This model ignores the aerodynamic interactions between different blade elements, and the forces on the blade are determined from the balance between momentum theory and blade element theory. With this method, it is possible to calculate the aerodynamic performance for different settings with low computational cost. For the mid-fidelity approach, the Actuator Line Modeling method implemented in turbinesFoam (an OpenFOAM library) is used. This method is built upon a combination of the blade element theory for modeling the blades, and a Navier-Stokes description of the wake flow field. Thus, it can capture the wake dynamics without resolving the detailed flows near the blades. The aerodynamic performance of the DTU 10 MW reference wind turbine rotor is studied using the two methods. The effects of wind speed, tip speed ratio, and blade pitch angles are assessed. Good agreement is observed between the two methods at low tip speed ratios, while the Actuator Line Modeling method predicts slightly higher power coefficients at high tip speed ratios. In addition, the ability of the Actuator Line Modeling Method to capture the wake dynamics of the rotor in an unsteady inflow is demonstrated. In the future, the multi-fidelity aerodynamic modules developed in this paper will be integrated with the hydro-kinematics and hydro-dynamics of a floating platform and a mooring system, to achieve a fully coupled framework for the analysis and design optimization of floating offshore wind turbines.

scholarly journals Numerical Investigations of a Vertical Axis Wind Turbine with Variable Pitch

2017 ◽  
Vol 1 (15) ◽  
pp. 831-836
Author(s):  
F. Frunzulica ◽  
C. Olteanu ◽  
A. Dumitrache ◽  
D. Crunteanu
Keyword(s):  
Wind Turbine ◽  
Vertical Axis ◽  
Vertical Axis Wind Turbine ◽  
Variable Pitch ◽  
Numerical Investigations

A Note on the Decomposition of Aerodynamic Forces Induced by A Wind Turbine Flaps

2020 ◽  
Vol 36 (5) ◽  
pp. 585-593
Author(s):  
Y. Y. Niu ◽  
P. J. Shih ◽  
S. C. Kong
Keyword(s):  
Wind Turbine ◽  
Aerodynamic Force ◽  
Rotational Velocity ◽  
Angular Acceleration ◽  
Surface Friction ◽  
Vertical Axis ◽  
Vertical Axis Wind Turbine ◽  
Gurney Flap ◽  
Force Element ◽  
Element Theory

ABSTRACTIn this study, the aerodynamic characteristics of a vertical-axis wind turbine blade coupled with a high-lift device, such as the Gurney flap at the trailing edge, are investigated. For numerical analysis, the force element theory is used to understand how the Gurney flap influences the force evolution of the lift-type vertical-axis wind turbine. This study shows that the lift and drag can be respectively approximated into four elements, which are induced by volume vorticity, rotational velocity, angular acceleration and surface friction of the flow around the blades. Based on the perspective of the force element theory, the present simulation provides a clear picture of how the Gurney flap influences the formation of the aerodynamic force elements during a rotational cycle for a vertical-axis wind turbine. Simulation results show that the contributions mainly result from the surface vorticities, the rotational acceleration of the airfoil, and the acceleration of the surface.

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