Wind Forces on Rotating Small Wind Turbine Blade Tip using Wind Tunnel Measurements

2016 ◽  
Vol 6 (5) ◽  
pp. 41
Author(s):  
P. Saravanan ◽  
K.M. Parammasivam
Keyword(s):  
Wind Tunnel ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Wind Turbine Blade ◽  
Small Wind Turbine ◽  
Wind Tunnel Measurements ◽  
Blade Tip

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.

Smart structure for small wind turbine blade

2013 ◽  
Author(s):  
E. E. Supeni ◽  
J. A. Epaarachchi ◽  
M. M. Islam ◽  
K. T. Lau
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Wind Turbine Blade ◽  
Smart Structure ◽  
Small Wind Turbine

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.

scholarly journals An investigation into a small wind turbine blade design

2021 ◽  
Author(s):  
Sayem Zafar
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Structural Integrity ◽  
Electrical Power ◽  
Single Layer ◽  
Wind Turbine Blade ◽  
Blade Design ◽  
Small Wind Turbine ◽  
Start Up ◽  
Turbine Blade Design

The objective of the project was to design a small wind turbine blade which is aerodynamically efficient and easy to manufacture. Preliminary aerodynamic analysis concluded NACA 63-425 to be the most efficient airfoil. Blade geometry was determined after calculating baseline geometric values for low drag which was then used to calculate power. Blade's structural integrity was studied using ANSYS® software. Tested results yielded that a single layer of E-fibreglass-epoxy is good enough to sustain the prescribed loads. The results were used to calculate the total weight of the blade which was then used to determine the start-up speed. Overall the project was successful in designing a wind turbine blade that produced 450 [W] of electrical power at 4[m/s] wind speed with the start-up speed of around 2[m/d]. The project fulfilled its objective which was to design a more effective wind turbine blade with manufacturability in mind.

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