Rotors for extracting energy from wind and hydrokinetic sources

Abstract

Rotors for devices such as wind turbines have one or more blades that each include a first airfoil, and a second airfoil positioned proximate the first airfoil so that the first and second airfoils interact aerodynamically during rotation of the rotor. The first airfoil can be configured to pivot so that its angle of attack remains approximately zero.

Description

technical field [0001] The concepts covered in this abstract relate to rotor devices that extract energy from wind and other fluids. The concept is applicable to both horizontal and vertical wind turbines, as well as aircraft, hydrofoils and many other devices. Background technique [0002] Wind turbines are widely used to generate electricity. The components of a wind turbine include a rotor, a generator, and a gearbox that connects the rotor to the generator. The rotor extracts energy from the passing wind. The rotor can be equipped with one or more wind blades. The vanes interact aerodynamically with the passing air, causing the rotor to turn. The torque of the rotor is transmitted to the generator through the gearbox. The gearbox usually increases the speed appropriately to allow the generator to operate efficiently. Driven by the gearbox, the rotor of the generator rotates at high speed in the magnetic field to generate electricity. [0003] The rotor is equipped...

AI Technical Summary

Problems solved by technology

But its highest efficiency can only appear in a narrow operating range

Additionally, most VAWT rotors, including cyclogyro, experience violent stalls when operating at tip speed ratios of 2 or less

Violent stalls induce vibration and reduced output

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