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The windmills at Kinderdijk in the village of Kinderdijk, Netherlands is a UNESCO World Heritage Site. A windmill is a structure that converts wind power into rotational energy using vanes called sails or blades, by tradition specifically to mill grain (), but in some parts of the English-speaking world, the term has also been extended to encompass windpumps, wind turbines, and other applications.
Spring sails were invented by Scottish millwright Andrew Meikle in 1772. The sail is divided into a number of bays, each having a number of shutters. All the shutters are joined together by a shutter bar, and the force required for the wind to open the shutters is adjusted by a separate spring on each sail.
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
The rotor-powered InVentus Ventomobile racing at the Aeolus Race 2008 Small wind turbine power output. Rotor-powered vehicles are wind-powered vehicles that use rotors—instead of sails—which may have a shroud around them or constitute an unducted propeller, and which may adjust orientation to face the apparent wind. The rotor may be ...
Lateral force is a reaction supplied by the underwater shape of a sailboat, the blades of an ice boat and the wheels of a land sailing craft. Sailboats rely on keels , centerboards , and other underwater foils, including rudders, that provide lift in the lateral direction, to provide hydrodynamic lateral force ( P LAT ) to offset the lateral ...
A Darrieus wind turbine has blades that approximate the shape of a troposkein to minimize bending stresses. In physics and geometry, the troposkein (from Ancient Greek: τρόπος, romanized: trópos, lit. 'turn' and: σχοῖνος, romanized: skhoînos, lit.
Blade pitch control is a feature of nearly all large modern horizontal-axis wind turbines.It is used to adjust the rotation speed and the generated power. While operating, a wind turbine's control system adjusts the blade pitch to keep the rotor speed within operating limits as the wind speed changes.
The pitch bearing, also named blade bearing, is a component of modern wind turbines which connect the rotor hub and the rotor blade. [1] The bearing allows the required oscillation to control the loads and power of the wind turbine. The pitch system brings the blade to the desired position by adapting the aerodynamic angle of attack. [2]