Aerodynamic Performance of Preferred Wind Turbine Airfoils

2012 ◽  
Author(s):  
Horacio Perez-Blanco ◽  
Maureen McCaffrey
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Incidence Angle ◽  
Aerodynamic Performance ◽  
Blade Element Theory ◽  
Using Data ◽  
Simple Evaluation ◽  
Turbine Airfoils ◽  
Operational Range ◽  
Element Theory

To investigate possible increases of the capacity factor of wind turbines, six airfoils are chosen for evaluation, three based on high Cl, low Cd/Cl, and wide operational range, and three others simply based on low Cd. Aerodynamic performance of the chosen airfoils is projected for a 45 m radius turbine using Blade Element Theory (BET) as translated in an existing computer program. Even though the airfoils do not differ significantly in shape, their performance is projected to differ in turbine performance calculations, with some generating more power than others at the same wind speed and air density. The aerodynamic performance obtained with the numerically tested airfoils is compared to that of an actual wind turbine of equal dimensions. Wind speed and directional changes can be large, and assessing their effect is complicated. Using data from the literature, a simple evaluation of the effect of wind speed can be incorporated into the power curve, and shown to be dependent on the airfoil type. Directional changes could lead to reduced output power, but they are more significant for BEs close to the hub than to the tip. The optimal incidence angle calculated with the program shows little variability with wind speed for all airfoils.

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.

Aerodynamic Performance Analysis of a Large Scale Wind Turbine Blade under Variable Condition

2013 ◽  
Vol 291-294 ◽  
pp. 527-530
Author(s):  
Peng Zhan Zhou ◽  
Fang Sheng Tan
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Wind Power ◽  
Turbine Blade ◽  
Large Scale ◽  
Aerodynamic Performance ◽  
Power Coefficient ◽  
Speed Ratio ◽  
Tip Speed Ratio ◽  
Variable Condition

Based on BLADED software, the aerodynamic performance of a large scale wind turbine blade was analyzed under variable condition. The results show that the rated power of the blade under variable condition is increased 10%, when the rated wind speed is changed from 10.5m/s to 11.0 m/s. The blade’s wind power coefficient is above 0.46, and its tip speed ratio is between 7.8 and 11.4. When its tip speed ratio is 9.5, the blade’s maximum wind power coefficient is 0.486. It is indicated that the blade has good aerodynamic performance and wide scope of wind speed adaptive capacity. The blade root’s equivalent fatigue load is 2.11 MN•m, and its extreme flapwise load is 4.61 MN•m. The loads under variable condition are both less than that of the designed condition, so the blade’s application under variable condition is safe.

Three Dimensional Modeling and Aerodynamic Analysis of MW Wind Turbine Blade

2011 ◽  
Vol 305 ◽  
pp. 274-278
Author(s):  
Hong Pan ◽  
Wen Lei Sun ◽  
Lian Ying He
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Three Dimensional ◽  
Aerodynamic Performance ◽  
Wind Turbine Blade ◽  
Transformation Theory ◽  
Aerodynamic Analysis ◽  
Blade Element Theory ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling

Wind turbine blade is one of the key components of wind turbine, and its aerodynamic performance largely determine the reliability of wind turbine. This paper use the momentum - blade element theory, and correction by Prandtl, Wilson correction, Glauert correction and other methods to modify the model of the blade to come to the aerodynamic model, then using the point of the coordinate transformation theory each the airfoil two dimensional coordinate will conversion into space coordinates, using UG of three-dimensional modeling software to model, and finally the aerodynamic performance of airfoil is analyzed. Through modeling and aerodynamic analysis, for the following structure optimization and control strategy laid a foundation.

Aerodynamic and Electromagnetic Analysis of a Variable Electromotive-Force Generator for a Wind Turbine

2012 ◽  
Author(s):  
N. Goudarzi ◽  
W. D. Zhu ◽  
R. Bowers
Keyword(s):  
Power Generation ◽  
Wind Speed ◽  
Wind Turbine ◽  
Electromotive Force ◽  
Electromagnetic Analysis ◽  
Low Wind Speed ◽  
Mathematical Techniques ◽  
Force Generator ◽  
Operational Range ◽  
The Mathematical Model

A question that usually arises is whether an existing wind turbine with a specified rotor can be modified to expand its operational range and improve the power generation. There are various methods to achieve this goal and one of them can be a modified generator referred to as a variable electromotive-force generator (VEG), where the overlap between the rotor and the stator is made to be adjustable. In this work the possibility of harnessing more wind power via a VEG in areas with large changes in the wind speed from very low to high values throughout a year is investigated theoretically. Aerodynamic and mathematical techniques are used to estimate the generated power of a wind turbine in the low wind speed region, and a combination of electromagnetic and aerodynamics principles are employed to obtain the mathematical model of the VEG with an adjustable overlap between the rotor and the stator. The Neg-Micon wind turbine (NM-72) specifications for a certain site in Thailand are used for the numerical analysis. The results show the possibility of expanding the operational range and increasing the power generation of the studied wind turbine.

scholarly journals Numerical Investigation of Aerodynamic Performance of Wind Turbine Airfoils with Ice Accretion

2021 ◽  
Author(s):  
Khaled Yassin ◽  
Hassan Kassem ◽  
Bernhard Stoevesandt ◽  
Thomas Klemme ◽  
Joachim Peinke
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Wind Turbine ◽  
Numerical Investigation ◽  
Rough Surfaces ◽  
Turbine Blades ◽  
Aerodynamic Performance ◽  
Ice Accretion ◽  
Wind Turbine Blades ◽  
Turbine Airfoils

Abstract. One of the emerging problems in modern computational fluid dynamics is the simulation of flow over rough surfaces, wind turbine blades with ice on its surface for instance. An alternative method to numerically simulate rough surfaces instead of using a grid with y+ 

On the Performance of Lanchester’s “Aerial Tourbillion“

1964 ◽  
Vol 68 (644) ◽  
pp. 561-564 ◽  
Author(s):  
C. V. Parkinson
Keyword(s):  
Wind Speed ◽  
Wind Tunnel ◽  
Rotation Speed ◽  
Blade Element Theory ◽  
Wind Tunnel Measurements ◽  
Element Theory ◽  
Good Agreement ◽  
Blade Element

SummaryWind tunnel measurements of the auto-rotation characteristics of Lanchester’s “aerial tourbillion” are presented in the form of tip speed plotted against wind speed. Three configurations were tested, a 10.94 inch diameter model with and without a cowling, and a 7.50 inch diameter model without a cowling. All showed a minimum wind speed for auto-rotation, dependent on friction at the shaft. At each wind speed above this value, there were two equilibrium rotational speeds, an unstable one, giving the required initial rpm for auto-rotation, and a higher stable one, the auto-rotation speed, which with increasing wind speed rapidly approached proportionality to the wind speed.Fairly good agreement with an approximate blade element theory was demonstrated, the best agreement being obtained with the measurements on the model with cowling.

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