The impact of inertial forces on morphing wind turbine blade in vertical axis configuration

2015 ◽  
Vol 91 ◽  
pp. 54-62 ◽  
Author(s):  
Jonathan Butbul ◽  
David MacPhee ◽  
Asfaw Beyene
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Vertical Axis ◽  
Wind Turbine Blade ◽  
Inertial Forces ◽  
The Impact

Strategy for diagnosing the degree of dynamic stall on a vertical-axis wind turbine blade

2022 ◽  
Author(s):  
David Bensason ◽  
Sébastien Le Fouest ◽  
Anna M. Young ◽  
Karen Mulleners
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Vertical Axis ◽  
Wind Turbine Blade ◽  
Dynamic Stall ◽  
Vertical Axis Wind Turbine

Multi-objective Optimization and Experimental Testing of a Laminated Vertical-Axis Wind Turbine Blade

2021 ◽  
pp. 39-65
Author(s):  
Zorana Trivković ◽  
Jelena Svorcan ◽  
Marija Baltić ◽  
Nemanja Zorić ◽  
Ognjen Peković
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Experimental Testing ◽  
Vertical Axis ◽  
Wind Turbine Blade ◽  
Multi Objective Optimization ◽  
Vertical Axis Wind Turbine ◽  
Multi Objective

Simulation studies to analyze the static mechanical properties of helical Savonius vertical axis wind turbine blade

2020 ◽  
Vol 33 ◽  
pp. 3737-3745
Author(s):  
S. Seralathan ◽  
Ch. Pavan Veera Sai Ganesh ◽  
Bhanu Prakash Reddy Venganna ◽  
N. Sai Srinivas ◽  
B. Lokesh Chowdary ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Vertical Axis ◽  
Wind Turbine Blade ◽  
Simulation Studies ◽  
Vertical Axis Wind Turbine ◽  
Static Mechanical ◽  
Static Mechanical Properties

Wind Turbine Blade Coating Fatigue Induced by Raindrop Impact

2020 ◽  
Author(s):  
Weifei Hu ◽  
Weiyi Chen ◽  
Xiaobo Wang ◽  
Zhenyu Liu ◽  
Jianrong Tan ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Crack Growth ◽  
Turbine Blade ◽  
Wind Turbine Blade ◽  
Rain Event ◽  
Rain Intensity ◽  
Texture Model ◽  
The Impact ◽  
Blade Coating ◽  
Raindrop Impact

Abstract With the increase of wind energy production demand, the need to manufacture larger wind turbine blades is on the rise. Because of the high tip speed of the large blade, the blade could be impacted by high-speed objects such as raindrops. This research focuses on developing a computational model for analyzing wind turbine blade coating fatigue induced by raindrop impact. A stochastic rain texture model is used to simulate a realistic rain event determined by a rain intensity and a rain duration. A smoothed particle hydrodynamic approach is implemented to calculate the impact stress considering a single raindrop. A stress interpolation method is proposed to accurately and efficiently estimate the impact of stress under a random rain event. Besides, a crack growth law is used to explain the process of coating shedding. Through a method for calculating crack growth length based on stress, this paper analyzes crack growth life as a function of the rain intensity and the rain duration. This function, together with the statistics of rainfall history, provides a new approach for estimating the expected fatigue life of the blade coating.

Experimental and Numerical Investigation of Inflow Turbulence on the Performance of Wind Turbine Airfoils

2013 ◽  
Author(s):  
O. Eisele ◽  
G. Pechlivanoglou ◽  
C. N. Nayeri ◽  
C. O. Paschereit
Keyword(s):  
Wind Tunnel ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Wind Tunnel Test ◽  
Wind Turbine Blade ◽  
Two Dimensional ◽  
Airfoil Surface ◽  
Wind Tunnel Measurements ◽  
Inflow Turbulence ◽  
The Impact

Wind turbine blade design is currently based on the combination of a plurality of airfoil sections along the rotorblade span. The two-dimensional airfoil characteristics are usually measured with wind tunnel experiments or computed by means of numerical simulation codes. The general airfoil input for the calculation of the rotorblade power characteristics as well as the subsequent aerodynamic and aeroelastic loads are based on these two-dimensional airfoil characteristics. In this paper, the effects of inflow turbulence and wind tunnel test measurement deviations are investigated and discussed, to allow considerations of such effects in the rotorblade design process. The results of CFD simulations with various turbulence models are utilized in combination with wind tunnel measurements in order to assess the impact of such discrepancies. It seems that turbulence, airfoil surface roughness and early transition effects are able to contribute significantly to the uncertainty and scattering of measurements. Various wind tunnel facilities generate different performance characteristic curves, while grid-generated turbulence is generally not included in the wind tunnel measurements during airfoil characterization. Furthermore the correlation of grid-generated wind tunnel turbulence with the atmospheric turbulence time and length scales is not easily achieved. All the aforementioned uncertainties can increase the performance scattering of current wind turbine blade designs as well as the generated aeroelastic loads. A brief assessment of the effect of such uncertainties on wind turbine performance is given at the last part of this work by means of BEM simulations on a wind turbine blade.

Analysis of Structural Vibrations of Vertical Axis Wind Turbine Blades via Hamilton’s Principle — Part 3: Pitch Angle and Equilibrium State

2021 ◽  
pp. 2150070
Author(s):  
Jianyou Huang ◽  
Chia-Ou Chang ◽  
Chien-Cheng Chang
Keyword(s):  
Exact Solution ◽  
Equilibrium State ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Pitch Angle ◽  
Coupling Effect ◽  
Turbine Blades ◽  
Vertical Axis ◽  
Wind Turbine Blade ◽  
Vertical Axis Wind Turbine

Pitch angle is one of the most important parameters of wind turbine blade. This study is aimed to investigate the effect of the pitch angle on the deformation of a VAWT. Lagrangian mechanics and Euler’s beam theory are used to derive the motion equations of linear structural vibration for straight blade vertical axis wind turbine blade with the pitch angle [Formula: see text]. The complete equations of motion take account of the 4-DOF deformation of flexural–flexural–torsion–extension as well as the material damping. Vibration analysis of generalized displacement about the equilibrium state (GDAES) is carried out with respect to the displacement of the equilibrium state (DOES), which is separated from the motion of vibration. After simplifying the equilibrium equation of 4-DOF into 1-DOF system, the exact solution of displacement [Formula: see text] of the equilibrium state is derived. The correction [Formula: see text] of [Formula: see text] due to the pitch angle and the characteristics of [Formula: see text] with constant linear speed are analyzed. Furthermore, we investigate the coupling effect of lateral bending and axial extension of the blade on [Formula: see text] is analyzed. Finally, the exact solution of [Formula: see text] is verified by the central difference method.

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