Wind & Wet
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Vertical axis wind turbine models

2 blade VAWT model 2 blade VAWT model

Two Blade VAWT model (2)

This was very similar to the first model except the blades were constructed more accurately. The aerofoil is a NACA0018 symmetrical section with the chord line curved to match the radius using the aerofoil plotter page.
Radius
150mm
Number blades
2
Blade chord
130mm
Blade thickness
24mm
Blade thickness (%)
18%
Blade length
190mm
Frontal area
57000mm2
Density
0.87
Blade area / frontal area
This will start more easily than the first model and runs more smoothly. It has similar characteristic of rotating at around wind speed and then accelerating beyond this when the wind picks up.
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Links

VAWT information
http://www.memagazine.org/backissues/membersonly/jun04/features/apptowind/apptowind.html

Wikipedia VAWT page
http://en.wikipedia.org/wiki/Vertical_axis_wind_turbine

Airfoil coordinates
http://www.ae.illinois.edu/m-selig/ads/coord_database.html

VAWT pitch control
http://www.cyberiad.net/library/pdf/we1992_16_5.pdf

Pitch control
http://www.cyberiad.net/library/pdf/we1993_17_2.pdf

Small VAWT wind tunnel tests
http://eprints.whiterose.ac.uk/10229/1/Howell1.pdf

VAWT pitch control and airfoils
http://aeroguy.snu.ac.kr/cyclocopter/paper/SPIE2006.pdf
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