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:
“We have heard all of our lives how, after the Civil War was over, the South went back to straighten itself out and make a living again. It was for many years a voiceless part of the government. The balance of power moved away from it—to the north and the east. The problems of the north and the east became the big problem of the country and nobody paid much attention to the economic unbalance the South had left as its only choice.”
—Lyndon Baines Johnson (1908–1973)
“Spig Wead: I’ve been thinking what a heel I’ve been about you and about my own kids. I don’t know, when I do something, I go all the way. Living. Gambling. Flying. I tap myself out. I guess that’s the way I want it to be. Maybe even the way I am.
Minne Wead: Star-spangled Spig. Damn the martinis, full speed ahead and don’t give up the ship.”
—Frank Fenton, William Wister Haines, co-scenarist, and John Ford. Spig Wead (John Wayne)