Simulating dynamic stall in a two-dimensional vertical-axis wind turbine: verification and validation with particle image velocimetry data

Wind Energy ◽  
2010 ◽  
Vol 13 (1) ◽  
pp. 1-17 ◽  
Author(s):  
C. J. Simão Ferreira ◽  
A. van Zuijlen ◽  
H. Bijl ◽  
G. van Bussel ◽  
G. van Kuik
Keyword(s):  
Particle Image Velocimetry ◽  
Wind Turbine ◽  
Particle Image ◽  
Particle Image Velocimetry Data ◽  
Vertical Axis ◽  
Verification And Validation ◽  
Dynamic Stall ◽  
Two Dimensional ◽  
Vertical Axis Wind Turbine ◽  
Image Velocimetry

Experimental Study of Free Stream Turbulent Effects on Dynamic Stall of Pitching Airfoil by Using Particle Image Velocimetry

2012 ◽  
Vol 225 ◽  
pp. 103-108 ◽  
Author(s):  
Tzong Shyng Leu ◽  
J.M. Yu ◽  
C.C. Hu ◽  
J.J. Miau ◽  
S.Y. Liang ◽  
...  
Keyword(s):  
Particle Image Velocimetry ◽  
Turbulence Intensity ◽  
Particle Image ◽  
Free Stream ◽  
Vertical Axis ◽  
Dynamic Stall ◽  
Vertical Axis Wind Turbine ◽  
Free Stream Turbulence ◽  
Pitching Airfoil ◽  
Image Velocimetry

The unsteady flow fields above NACA 0015 airfoil pitching with/without upstream turbulence generator are investigated in a water tunnel by mean of particle image velocimetry (PIV). The turbulence was generated by a square bar mesh situated at the inlet of the test section. The airfoil pitching waveform is performed under the condition calculated from the angle of attack histogram of a vertical axis wind turbine (VAWT). By using PIV, the instantaneous vortex structures above the pitching airfoil can be revealed. It allows us to study the free stream turbulence effects on dynamic stall over an airfoil at pitching waveform the same as VAWT. It is found that the free stream turbulence intensity has significant impacts on the dynamic stall process. The dynamic stall process is delayed to higher incidence angles on increasing the turbulence intensity.

On the Use of Velocity Data for Load Estimation of a VAWT in Dynamic Stall

2011 ◽  
Vol 133 (1) ◽  
Author(s):  
Carlos J. Simão Ferreira ◽  
Gerard J. W. van Bussel ◽  
Gijs A. M. van Kuik ◽  
Fulvio Scarano
Keyword(s):  
Velocity Field ◽  
Wind Turbine ◽  
Turbine Blades ◽  
Pressure Sensors ◽  
Vertical Axis ◽  
Dynamic Stall ◽  
Velocity Data ◽  
Vertical Axis Wind Turbine ◽  
Wind Turbine Blades ◽  
Image Velocimetry

This paper focuses on evaluating the feasibility of estimating loads on vertical axis wind turbine blades in dynamic stall with velocity data acquired with Particle Image Velocimetry. The study uses numerical simulation data of a 2D Vertical Axis Wind Turbine in dynamic stall to verify sources of error and uncertainty and estimate the accuracy of the method. The integration of the forces from the velocity field overcomes the difficulties and limitations presented by pressure sensors for estimating the local section loads, but adds the difficulty in determining the correct velocity field and its time and spatial derivatives. The analysis also evaluates the use of phase-locked average data as an estimator of average loads.

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