Modal Analysis on a Wind Turbine Blade Based on Wind Tunnel Experiments

2020 ◽  
pp. 1-7
Author(s):  
L. G. Trujillo-Franco ◽  
H. F. Abundis-Fong ◽  
R. Campos-Amezcua ◽  
R. Gomez-Martinez
Keyword(s):  
Wind Tunnel ◽  
Wind Turbine ◽  
Modal Analysis ◽  
Turbine Blade ◽  
Wind Turbine Blade ◽  
Wind Tunnel Experiments

scholarly journals Modal analysis of an iced offshore composite wind turbine blade

2021 ◽  
pp. 0309524X2110116
Author(s):  
Oumnia Lagdani ◽  
Mostapha Tarfaoui ◽  
Mourad Nachtane ◽  
Mourad Trihi ◽  
Houda Laaouidi
Keyword(s):  
Wind Turbine ◽  
Modal Analysis ◽  
Turbine Blade ◽  
Natural Frequencies ◽  
Wind Turbine Blade ◽  
Resonance Phenomenon ◽  
Mode Shapes ◽  
The Finite Element Method ◽  
Numerical Work ◽  
Composite Blades

In the far north, low temperatures and atmospheric icing are a major danger for the safe operation of wind turbines. It can cause several problems in fatigue loads, the balance of the rotor and aerodynamics. With the aim of improving the rigidity of the wind turbine blade, composite materials are currently being used. A numerical work aims to evaluate the effect of ice on composite blades and to determine the most adequate material under icing conditions. Different ice thicknesses are considered in the lower part of the blade. In this paper, modal analysis is performed to obtain the natural frequencies and corresponding mode shapes of the structure. This analysis is elaborated using the finite element method (FEM) computer program through ABAQUS software. The results have laid that the natural frequencies of the blade varied according to the material and thickness of ice and that there is no resonance phenomenon.

Modal Analysis of a Wind Turbine Blade Using a Computational Method

2021 ◽  
pp. 23-34
Author(s):  
M.J. Pawar ◽  
Amar Patnaik ◽  
Vikas Kukshal ◽  
Ashiwani Kumar ◽  
Vikash Gautam
Keyword(s):  
Wind Turbine ◽  
Modal Analysis ◽  
Turbine Blade ◽  
Wind Turbine Blade ◽  
Computational Method

scholarly journals Modal Analysis of Vertical Wind Turbine Blade

2018 ◽  
Vol 217 ◽  
pp. 01003 ◽  
Author(s):  
Lee Zhou Yi ◽  
Choe-Yung Teoh
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Modal Analysis ◽  
Turbine Blade ◽  
Wind Turbine Blade ◽  
Flow Induced Vibration ◽  
Low Wind Speed ◽  
Teak Wood ◽  
Blade Failure ◽  
Wind Induced Vibration

Wind turbines cannot simply be installed in Malaysia due to low wind speed condition. the project has analyzed the existing wind turbine blade (Aeolos-V 1k) design based on modal properties using computational approach (ANSYS Workbench) and redesign it. the modal analysis is simulated to observe natural frequency and corresponding mode shaped of the system under free vibration. the flow induced vibration can cause blade failure due to resonance or fatigue. Fluid Structural Interaction (FSI) ANSYS is used to the determined the interaction between the wind flow and the blade. Harmonic Response ANSYS is used to analyze the frequency response of the blade under wind induced vibration. After modification, the first mode has increased from 91.42 Hz to 102.12, since it is more than 50.92 Hz (Turbine maximum operating frequency), resonance would not occur during operating condition. the Aeolos-V’s blade has been modified by using. teak wood material and. redesign the blade for weight. reduction and aim for lower blade cost. the weight of modified blade has reduced 72.8 % after using teak wood and the efficiency of the wind turbine also increased. Modified design has been tested under Malaysia maximum wind speed of 9.44 m/s, the yield stress of teak wood (10.3 MPa) is higher than the maximum stress (4.2 MPa) obtained under force vibration which gives safety factor of 2.4. Hence, modified blade is reliable, efficient and more economic for Malaysia.

Investigation of an Eppler 423 Style Wind Turbine Blade

2010 ◽  
Author(s):  
David M. McStravick ◽  
Brent C. Houchens ◽  
David C. Garland ◽  
Kenneth E. Davis
Keyword(s):  
Wind Tunnel ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Wind Turbines ◽  
Alternative Energy ◽  
Wind Turbine Blade ◽  
Cfd Modeling ◽  
Horizontal Axis Wind Turbine ◽  
Alternative Energy Sources ◽  
Ansys Cfx

Due to the increasing demand for alternative energy sources and the reliability of wind turbines, the performance of different horizontal-axis wind turbine blade designs were investigated and compared through computational fluid dynamics (CFD) modeling and wind tunnel testing. The Eppler 423 airfoil was of particular interest. In avionics the blade has been associated with high lift and a low tendency to stall, yet little is known about its performance in wind turbines. In both physical testing and ANSYS CFX 11.0 analysis, the airfoil significantly outperformed a Nordtank 41/500 turbine blade. Wind tunnel tests were performed on 12-inch diameter ABS polymer prototypes, created with a 3D printer. To exaggerate the features of each prototype and obtain more measureable differences in turbine performance, the blades are scaled down more in the radial direction than in the profile section directions. The Eppler 423 airfoil design was tested at different blade base angles. The testing identified an optimum power production for a blade base angle of 25°. In the ANSYS CFX computer simulations, the moments on to the turbine blade due to the incoming air allowed for the power generated and the coefficient of power (Cp) to be determined and compared. The Eppler profile outperformed the Nordtank blade profile in these simulations.

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.

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