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2. Wind turbine design - Wikipedia

   en.wikipedia.org/wiki/Wind_turbine_design

   An example of a wind turbine, this 3 bladed turbine is the classic design of modern wind turbines Wind turbine components : 1-Foundation, 2-Connection to the electric grid, 3-Tower, 4-Access ladder, 5-Wind orientation control (Yaw control), 6-Nacelle, 7-Generator, 8-Anemometer, 9-Electric or Mechanical Brake, 10-Gearbox, 11-Rotor blade, 12-Blade pitch control, 13-Rotor hub

3. Wind turbine - Wikipedia

   en.wikipedia.org/wiki/Wind_turbine

   For the wind turbine blades, while the material cost is much higher for hybrid glass/carbon fiber blades than all-glass fiber blades, labor costs can be lower. Using carbon fiber allows simpler designs that use less raw material. The chief manufacturing process in blade fabrication is the layering of plies.

4. Wind-turbine aerodynamics - Wikipedia

   en.wikipedia.org/wiki/Wind-turbine_aerodynamics

   Drag-based machines are conceptually simple, yet suffer from poor efficiency. Efficiency in this analysis is based on the power extracted vs. the plan-form area. Considering that the wind is free, but the blade materials are not, a plan-form-based definition of efficiency is more appropriate.

5. Variable speed wind turbine - Wikipedia

   en.wikipedia.org/wiki/Variable_speed_wind_turbine

   A variable speed wind turbine is one which is specifically designed to operate over a wide range of rotor speeds. It is in direct contrast to fixed speed wind turbine where the rotor speed is approximately constant. The reason to vary the rotor speed is to capture the maximum aerodynamic power in the wind, as the wind speed varies.

6. Betz's law - Wikipedia

   en.wikipedia.org/wiki/Betz's_law

   In high wind speed, where the turbine is operating at its rated power, the turbine rotates (pitches) its blades to lower C P to protect itself from damage. The power in the wind increases by a factor of 8 from 12.5 to 25 m/s, so C P must fall accordingly, getting as low as 0.06 for winds of 25 m/s.

7. IEC 61400 - Wikipedia

   en.wikipedia.org/wiki/IEC_61400

   The extreme wind speeds are based on the 3 second average wind speed. Turbulence is measured at 15 m/s wind speed. This is the definition in IEC 61400-1 edition 2. For U.S. waters however, several hurricanes have already exceeded wind class Ia with speeds above the 70 m/s (156 mph), and efforts are being made to provide suitable standards. [8]

8. Rotational sampling in wind turbines - Wikipedia

   en.wikipedia.org/wiki/Rotational_sampling_in...

   In a horizontal axis wind turbine, both the apparent wind speed seen by the blade and the angle of attack depends on the blade's position. This phenomenon is described as rotational sampling. This article will provide insight into the cyclic nature of the loads that arise because of rotational sampling for a horizontal axis wind turbine.

9. Blade element momentum theory - Wikipedia

   en.wikipedia.org/wiki/Blade_Element_Momentum_Theory

   Blade element momentum theory is a theory that combines both blade element theory and momentum theory. It is used to calculate the local forces on a propeller or wind-turbine blade. Blade element theory is combined with momentum theory to alleviate some of the difficulties in calculating the induced velocities at the rotor.