Tip Speed Ratio
The tip-speed ratio, λ (lambda), or TSR for wind turbines is the ratio between the rotational speed of the tip of a blade and the actual velocity of the wind. If the velocity of the tip is exactly the same as the wind speed, the tip-speed ratio is 1.0. The tip-speed ratio is related to efficiency, with the optimum varying with blade design. Higher tip speeds result in higher noise levels and require stronger blades due to large centrifugal forces.
The tip speed of the blade can be calculated as times R, where is the rotor rotational speed in radians/second, and R is the rotor radius in meters. Therefore we can also write:
when wind speed is specified in meters/second. –
Read more about Tip Speed Ratio: Cp - λ Curves
Famous quotes containing the words tip, speed and/or ratio:
“When words reach the tip of your tongue, hold back half of them.”
—Chinese proverb.
“Wait, Kate! You skate at such a rate
You leave behind your skating mate.
Your splendid speed won’t you abate?
He’s lagging far behind you, Kate.”
—David Daiches (b. 1912)
“People are lucky and unlucky not according to what they get absolutely, but according to the ratio between what they get and what they have been led to expect.”
—Samuel Butler (1835–1902)