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The tip-speed ratio, λ, or TSR for wind turbines is the ratio between the tangential speed of the tip of a blade and the actual velocity of the wind, . The tip-speed ratio is related to efficiency, with the optimum varying with blade design.〔http://www.reuk.co.uk/Wind-Turbine-Tip-Speed-Ratio.htm〕 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. – == Cp - λ curves == The power co-efficient, is a quantity that expresses what fraction of the power in the wind is being extracted by the wind turbine. It is generally assumed to be a function of both tip-speed ratio and pitch angle. Below is a plot of the variation of the power coefficient with variations in the tip-speed ratio when the pitch is held constant: 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Tip-speed ratio」の詳細全文を読む スポンサード リンク
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