The present wind turbine blade comprises an airfoil structure comprising an airfoil shape, an internal support structure arranged spanwise along the length of the blade within the airfoil structure, and an elastic connection joining a portion of an inner surface of the airfoil structure with a portion of the internal support structure. The airfoil structure can be passively pitched relative to the internal support structure according to aerodynamic pressure distribution at different blade locations.

Method of reducing loads acting on a wind turbine yaw system in a wind turbine comprising a nacelle (2), a rotor which comprises at least one rotor blade (3) with a pitch control system and further comprising a yaw system that comprises the steps of detecting a yaw misalignment (), enabling a yaw maneuver and performing a pitch control in order to reduce a yaw moment (Mz) acting on the wind turbine once the yaw misalignment () is detected and prior to enabling the yaw maneuver. Thus, when a yaw movement to reduce the yaw misalignment is commanded, the yaw moment (Mz) due to aerodynamic forces has been reduced by means of the pitch control and undesired yaw movements are prevented.

The invention disclosed a vertical axis wind turbine with automatic blade adjustment of blade angle, comprising a pillar, a rotational axis disposed at the pillar, and a plurality of wind turbine assemblies rotating around the pillar. Each wind turbine assembly comprises a blade, a support, and a swing axis. The swing axis comprises an axial core element and an axis element, fixed to the blade and uses the axial core element to engage the support to make the blade to swing on the axial core element with an angle within 90. The blade comprises first and second blade areas, with an imaginary line of center of gravity dividing first and second blade areas. When the blade is at 0, the imaginary line overlaps the projection of centrifugal force direction of an extension line of axis of the swing axis, but the line shall not actually overlap the extension line.

A vertical axis wind turbine including a vertical central shaft and a plurality of vertical blades. Each of the vertical blades is supported by a radial supporting arm extending from the central shaft. The shaft is such that the angular disposition of each of the blades is relative to its radial supporting arm, and is controlled by a control mechanism. The control mechanism includes two differential resilient elements and a damping element.

The invention relates to a rotor for a vertical axis turbine comprising: a blade support structure extending from a center of the rotor, a blade pivotally coupled to the blade support structure at a distance from the center of the rotor, anda pitch regulating mechanism arranged between the blade support structure and the blade to regulate the pitch of the blade in dependence of fluid dynamic forces acting on the blade, wherein the pitch regulating mechanism comprises a damper system, wherein the damper system has a first damping coefficient in a first rotational direction of the blade relative to the blade support structure and a second damping coefficient in a second rotational direction of the blade relative to the blade support structure.

The apparatus includes a wind turbine system for the collection of wind energy and the conversion thereof through staged-compression into highly compressed gas. The highly compressed gas is routed to a central tank, and then expanded into a plurality of concentric ring tanks, each storing gas at successively lower pressures. The cooling resulting from this expansion is utilized to cool hot compressed gas from an intermediate line of gas compressors, increasing the efficiency of the following compressors. This absorption of heat also improves the efficiency of the gas turbines driving electrical generators. The gas compressor in each wind turbine is located near ground level, and driven by a vertical shaft passing through the wind turbine support tower. One embodiment has conventional radially extending blades, and another embodiment has ducted blades to withstand higher winds. Both ground mounted and deep water adaptions for the wind turbines are disclosed.

The apparatus includes a wind turbine system for the collection of wind energy and the conversion thereof through staged-compression into highly compressed gas. The highly compressed gas is routed to a central tank, and then expanded into a plurality of concentric ring tanks, each storing gas at successively lower pressures. The cooling resulting from this expansion is utilized to cool hot compressed gas from an intermediate line of gas compressors, increasing the efficiency of the following compressors. This absorption of heat also improves the efficiency of the gas turbines driving electrical generators. The gas compressor in each wind turbine is located near ground level, and driven by a vertical shaft passing through the wind turbine support tower. One embodiment has conventional radially extending blades, and another embodiment has ducted blades to withstand higher winds. Both ground mounted and deep water adaptions for the wind turbines are disclosed.

The vertical wind turbine and system generally comprises a rotor assembly having a plurality of blades, a fixed central spindle having a central axis for supporting rotation of the rotor assembly, a blade adjustment mechanism assembly for adjusting the blade angle of attack throughout the rotation of the rotor assembly, and a support framework for supporting the rotor assembly at an elevated position to gain access to a sustained source of wind. The wind turbine may be operably coupled with a power electric generator or other device that transfers mechanical energy into electrical energy as a combined system.

The invention relates to a device for converting kinetic energy of a flowing water into kinetic energy of a rotatable rotor shaft, wherein the device is adapted to be effective in a first flow direction and a second flow direction substantially opposite to the first, wherein the device comprises two rotor blades each connected to a blade shaft coupled to the rotor shaft for transfer of a torque relative to the rotor shaft, wherein the blades are each rigidly connected to their blade shaft, the blade shafts are mounted for rotation about their own axis relative to the rotor shaft, the blade shafts are coupled to each other for rotation in the same rotation direction and the rotor blades each have an asymmetrical cross-section. There is hereby always flow against the asymmetrical rotor blades from the same direction relative to the blade during the energy conversion process, so that the profile of the rotor blades can be optimized for this flow direction.