Power and Rotational Speed
The maximum power of a Savonius rotor is given by, where and are the height and radius of the rotor and is the wind speed.
The angular frequency of a rotor is given by, where is a dimensionless factor called the tip-speed ratio. λ is characteristic of a specific windmill, and its value is typically between 0.5 and 14. In a Savonius rotor, λ≈1.
For example, an oil-barrel sized Savonius rotor with h=1 m and r=0.5 m under a wind of v=10 m/s, will generate a maximum power of 160 W and an angular speed of 20 rad/s (190 revolutions per minute).
Read more about this topic: Savonius Wind Turbine
Famous quotes containing the words power and/or speed:
“The importance of a lost romantic vision should not be underestimated. In such a vision is power as well as joy. In it is meaning. Life is flat, barren, zestless, if one can find one’s lost vision nowhere.”
—Sarah Patton Boyle, U.S. civil rights activist and author. The Desegregated Heart, part 1, ch. 19 (1962)
“No speed of wind or water rushing by
But you have speed far greater.”
—Robert Frost (1874–1963)