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:
“A painter like Picasso, who runs through many periods and phases, ends up by saying all those things which are on the tip of the tongue of the age to say, and finally sterilizes the originality of his contemporaries and juniors.”
—Norbert Wiener (1894–1964)
“The greatest felony in the news business today is to be behind, or to miss a big story. So speed and quantity substitute for thoroughness and quality, for accuracy and context. The pressure to compete, the fear somebody else will make the splash first, creates a frenzied environment in which a blizzard of information is presented and serious questions may not be raised.”
—Carl Bernstein (b. 1944)
“A magazine or a newspaper is a shop. Each is an experiment and represents a new focus, a new ratio between commerce and intellect.”
—John Jay Chapman (1862–1933)