An impeller for wind power generation includes: a plurality of blades; and a hub which is provided with a rotating shaft at a center and around which the plurality of blades are arranged at substantially equal intervals in a circumferential direction. The blade is formed to extend while widening a width toward an outer periphery of the impeller, a line segment connecting a leading edge and a trailing edge of the blade is inclined at an angle of approximately 10 degrees or more and approximately 20 degrees or less with respect to a plane perpendicular to a rotating shaft of the impeller, and in the plurality of blades, a trailing edge of a blade on a front side in a rotation direction of the impeller and a leading edge of a blade on a rear side in the rotation direction partially overlap each other in a front view of the impeller.

The present invention is an improved wind turbine comprising: a wind turbine wheel having a hub, a rim and a cable extending between the hub and the rim; a set of airfoils rotatably carried by the cable and disposed between the hub and the rim; a cinch attached to the cable and disposed between adjacent airfoils; and, an upturned section included in at least one airfoil in the set of airfoils and disposed at a trailing edge of the airfoil wherein each airfoil has a different angle of attack relative to an adjacent airfoil.

A propeller having a means for creating fluid flow in a non-axial direction and redirecting it in an axial direction.

A rotor (10) for power driving includes a hub (12), a plurality of fixed jibs (14), and a plurality of vanes (16). The hub (12) is adapted to be coupled with a mechanical shaft (24) which is driven by winds, water flows or tides as driving sources. The fixed jibs (14) are arranged around the hub (12) circumferentially and spaced from one another. Each fixed jib (14) extends in a radial direction perpendicular to an axial direction of the shaft (24). Each vane (16) is elastically fixed at one of the fixed jibs (14) such that the vanes (16) on which external forces act are elastically movable relative to the fixed jibs (14) and rebound after removal of the external forces.

Systems and methods to generate electrical power through a direct drive wind turbine. In one aspect, the system uses a diffuser cuff surrounding a counter rotating turbine operating inside a streamlined center body, the counter rotating turbine using a generator with an iron sandwich core. The main wind turbine blades are attached to a barrel stave that increases generator efficiency and distributes loading through the tower support structure.

A high efficiency compressed-air power generation system has a main casing forming a main passage, a main rotor, an air distributor, and a main generator. The main passage has an intake section and a turbine section. The suction opening is connected to the intake section of the main passage, and the main outlet opening is connected to a turbine section of the main passage. The main rotor is rotatably mounted in the turbine section. The air distributor is configured to supply compressed air into the intake section via multiple nozzles directed toward the main turbine wheels. When compressed air is released from the air distributor, ambient air is sucked into the intake section by compressed air released by the air distributor utilizing Bernoulli's principle. The main rotor is rotated by a mixture of compressed air and ambient air to drive the main generator.

This invention discloses an improved wind turbine suitable for mounting without a wind turbine tower. The wind turbine is based on a rotor with appropriately selected blades. A nozzle and diffuser in the wind flow increase the amount of wind energy available to the rotor. The rotor is interruptibly connected with one or more of a plurality of generators which allows generation at a wide range of wind speeds. The rotor is also interruptibly connected with a co-axial flywheel which allows for storage or use of rotational energy as needed by the availability of wind energy. One or more wind turbines can be grouped together in a common housing. Electricity can also be generated by means of stored energy. The lack of a wind turbine tower and the general compact design allows the wind turbine to be used in close proximity to or on buildings.

A vertical axis wind energy power turbine having a hollow shaft on which are attached, rotating and fixed components with outer-surface shapes, fixed vanes, and integral heating to concentrate without confining airflow, an overspin-limiting power-enhancing self-engaging flywheel, and, conversion systems for both, pumped air that may be transferred through hollow mountings to do other work, and, for electricity generation.

Described herein is essentially a high-efficiency, hybrid fluid-aeolipile. In operation, this hybrid device is placed in the stream of a moving fluid, preferably air. Energy is extracted from the fluid stream by directing a portion of the stream through and, optionally, around the device. As the fluid-flow moves through the device, it is directed into nozzles. These nozzles, which are free to pivot in a cyclical manner, employ the established phenomenon of “nozzle-effect” to accelerate the velocity of the air-flow passing through them, which is ultimately ejected from each nozzle tip, producing thrust. This thrust, amplified by nozzle-effect, drives the nozzles to pivot around a shared axis. The wind energy, thereby converted into cyclical motion, that may be used to perform useful work, is converted with greater efficiency, than is possible in conventional blade-type wind turbines.

A horizontal axis rotor that has high wind reception efficiency and does not easily break. The rotor comprises blades that have high rotational efficiency, and are appropriate for a windmill or a waterwheel. A plurality of blades (3) are fixed to a rotor (1) so as to radiate from a peripheral surface of a hub (2). Each blade (3) is a lift-type blade that, as seen from the front, has a chord length that gradually increases from a base end part (4A) toward a blade end (3G). Each blade (3) has a forwardly curving part (5) that extends from a radial direction center part (3A) of the blade (3) to the tip of the blade (3), and a forward end surface (5A) of a forwardly directed tip end of the forwardly curving part (5) being a lift-type surface that, as seen from the front, has a thick forward edge (5F).