A dual rotor axis wind turbine that converts renewable energy into electrical energy. The dual rotor wind turbine addresses the counter productivity problem found in dual rotors wind turbines, which occurs due to adverse effects to the downwind rotor due to lying in the wake of the upwind rotor. The dual rotors lie on an axis with a relative angular displacement between the blades of such rotors, wherein the relative angular displacement is adjustable in order for the downwind rotor to avoid the counterproductive wake of the first rotor.

An auxiliary wind energy device comprising a valve device embodied as a rotating aperture plate located adjacent a fixed aperture plate to cyclically operate between open and closed positions to produce intermittent flow at the inlet of the housing and piezoelectric oscillator blades subject to said intermittent flow bending forwardly and backwardly to generate electrical current.

The invention relates to a three-propeller counter-rotating wind turbine that needs a smaller installation area compared to conventional wind turbines that are currently in use for the generation of electrical energy by benefitting from wind power in windy environments, and that nevertheless has higher production capacity, as well as increased productivity, and that does not employ gears, and that has a direct drive mechanism.

This invention relates to a voluminous wind/wave turbine system, the turbine system has two wind/wave subsystems and is based on a unique volume process and optimized blades defining two power zones to harness wind and wave energy together or separately beyond the Betz limit, the vortical wind turbine subsystem has a pair of a front and back vortical blades to generate more power with satellite generators, the wave subsystem is a breakthrough for commercial applications and has a robust float vessel with toroid or polygonal pipes structure and multiple hinge mechanisms to hold multiple wave turbines against violent wave, the wave turbine has only a conversion to produce electricity constantly 24/7 with 360 degree freedom, the both subsystems are based on a shaft-less twin rotor turbomachinery and represent a new era of reliable and renewable energy at an unprecedented level of efficiency and the reliability.

A wind energy harvesting machine with three counter-rotating rotors in a duct is disclosed. The wind energy harvesting machine includes a tower, a duct, a counter-rotating generator with two rotary parts, and three groups of blades. The duct includes supporting static stators in front and rear and a static nose cone in the front. The counter-rotating generator has a main shaft and rotary interior and exterior parts to rotating in opposite directions. Three rotary blade groups including front and rear blade groups rotatable around the main shaft in the same direction, and a middle blade group rotatable in an opposite direction. The front and rear blade groups are displaceable axially along the main shaft and the middle blade group is fixed on the exterior part of the counter-rotating generator.

A wind control blade (31) of a wind guide (30) of the present invention forms a 20° wind control blade lateral curved surface gradient angle (32), a 30° wind control blade longitudinal spiral twist angle (33), a 180° wing control blade alignment angle (34), and a 15° wind control blade rear gradient angle (35). In addition, a turbine blade (41) forms a 30° turbine blade lateral curved surface gradient angle (42), a 40° turbine blade longitudinal spiral twist angle (43), and a 120° turbine blade alignment angle (44). The 20° wind control blade lateral curved surface gradient angle (32) and the 30° wind control blade longitudinal spiral twist angle (33) of the wind control blade (31) have more gradual and wider incidence angles than the 30° turbine blade lateral curved surface gradient angle (42) and the 40° turbine blade longitudinal spiral twist angle (43) of the turbine blade (41). Accordingly, since more wind enters into the central direction of the inner side of the turbine blade (41) and a primary whirlwind is generated, much higher acceleration can be obtained.

A rotor for a wind turbine, in particular a wind turbine, having a power of more than 1 MW, to a hub for a rotor of a wind turbine and to a wind turbine. A rotor for a wind turbine, in particular a wind turbine having a power of more than 1 MW, comprising a primary rotor blade, wherein the primary rotor blade extends from a first root region to a first blade tip having a first longitudinal extension, a secondary rotor blade, wherein the secondary rotor blade extends from a second root region to a second blade tip having a second longitudinal extension, the first longitudinal extension being larger than the second longitudinal extension.

A wind-powered generator is provided. The wind-powered generator includes a housing defining an internal volume and having an inlet, an outlet, and a throat, the inlet, outlet, and throat being coaxial about an axis of symmetry of the housing, wherein a portion of the internal volume between a leading edge of the housing and the throat is defined by revolution of a curve about the axis of symmetry, and the internal volume between the throat and a trailing edge of the outlet is defined by revolution of a substantially straight line about the axis of symmetry and a nacelle mounted within the internal volume. The nacelle includes a first rotor mounted on a first end of the nacelle and positioned at least partially within the inlet, the first rotor comprising a first output shaft configured to output a first power output, and a second rotor mounted on a second end of the nacelle opposite the first end, the second rotor being positioned at least partially within the outlet and having a diameter less than the first rotor, wherein the second rotor comprises a second output shaft configured to output a second power output. The first power output and the second power output are combined within an interior portion of the nacelle to provide a combined power output of the wind-powered generator, and a nacelle ratio between an outer diameter of the nacelle at the inlet to an outer diameter of the nacelle at the outlet ranges from between about 1.60-1.70 as measured, and a housing ratio of an inner diameter of the housing at the inlet to an inner diameter of the housing at the outlet ranges from about 1.85-1.97.

The present invention relates to improving the efficiency of a helical fan/pump/propeller/turbine such as is described in PCT/NZ2018/050010. Further to the discovery that specific longitudinal limits are critical to define the first opening in relation to the helical fan/pump/propeller/turbine, it was found that certain lateral limits are also critical. Thus the configuration of the first opening and the helical blade cooperate according to both longitudinal and lateral limits to improve results. This was found to be the case in many applications whether the rotor is mechanically rotated or rotated by an external energy such as wind. In fact, common features such as this can enable the invention to switch between applications in some cases. The present invention also relates to a second opening longitudinally offset from the intake opening and an elongate stator extending from the rotor that is shaped according to the desired flow path

The Cascaded Wind Turbine is a new concept of wind turbine design featuring multiple hubs in succession, each hub segment adds another tier that create a cascading blade configuration. Each blade set is connected to a separate rotor via a telescopic shaft.