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:
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Upward and outward, in green-vented forms,
His tip a drop of water full of storms.”
—Wallace Stevens (1879–1955)
“The correct rate of speed in innovating changes in long-standing social customs has not yet been determined by even the most expert of the experts. Personally I am beginning to think there is more danger in lagging than in speeding up cultural change to keep pace with mechanical change.”
—Mary Barnett Gilson (1877–?)
“Personal rights, universally the same, demand a government framed on the ratio of the census: property demands a government framed on the ratio of owners and of owning.”
—Ralph Waldo Emerson (1803–1882)