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blade tip speed

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  • 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 …   Wikipedia

  • tip speed — The speed of a rotating airfoil, measured at its tip. It is generally subsonic except for the blade tips and the tips of the centrifugal compressors, which may be supersonic …   Aviation dictionary

  • Tip Speed Ratio —   In reference to a wind energy conversion device s blades, the difference between the rotational speed of the tip of the blade and the actual velocity of the wind …   Energy terms

  • Design Tip Speed Ratio —   For a wind turbine, the ratio of the speed of the tip of a turbine blade for which the power coefficient is at maximum …   Energy terms

  • Blade pitch — or simply pitch refers to turning the angle of attack of the blades of a propeller into or out of the wind to control the production or absorption of power. Wind turbines use this to adjust the rotation speed and the generated power. A propeller… …   Wikipedia

  • blade twist — i. The undesirable variation in pitch from root to tip caused by aerodynamic loading. ii. The twist built into a propeller or rotor blade. In the case of a propeller, it is to ensure that the pitch angle at the root is greater than the tip. In… …   Aviation dictionary

  • never-exceed speed — The speed beyond which it is not safe to fly an aircraft. It is normally less than the maximum diving speed (VD ). As it concerns rotary wing aircraft, the never exceed speed, VNE , must be established so that it is (i) not less than 40 knots… …   Aviation dictionary

  • open-tip turbine blade — A blade with no shroud attached to the tip. This blade can withstand a higher speed induced tip loading than the shrouded tip blade. Also called an open perimeter tip …   Aviation dictionary

  • retreating-blade stall — The stall of a helicopter rotor disc that occurs starting at the tip of the retreating blade. This happens when the helicopter forward speed is high. The individual angle of attack of the retreating blade becomes larger because the downward blade …   Aviation dictionary

  • Gas turbine — Microturbine redirects here. For turbines in electricity, see Small wind turbine. For turbines driven by the flow of gas, see Turbine. A typical axial flow gas turbine turbojet, the J85, sectioned for display. Flow is left to right, multistage… …   Wikipedia

  • Propfan — NASA / GE Unducted Fan A propfan was first defined as a small diameter, highly loaded multiple bladed variable pitch propulsor having swept blades with thin advanced airfoil sections, integrated with a nacelle contoured to retard the airflow… …   Wikipedia

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