Provided is a wind turbine blade, with a generally hollow blade body including half shells and webs the webs including flanges connecting the respective web to the respective half shell, and with webs being supported via reinforcement structures relative to the respective half shell, which reinforcement structures are arranged between an outer and an inner layer of each half shell and extend in the lengthwise direction of the blade, whereby the reinforcement structures each include at least one stack composed of several glass fiber layers infused with resin, and that at least one stiffening element extending parallel to the first and second reinforcement structures over at least a part of their length including at least one stack composed of several pultruded composite strips including carbon fibers with the strips being fixed in the resin is arranged between the first and second reinforcement structures.

Provided is a turbine blade, with a first and a second elongated web connected to an upper and a lower half shell, with each web including an upper and a lower flange connecting the respective web to the respective half shell, and with the first and second webs being supported by respective first and second reinforcement structures, which reinforcement structures extend in the lengthwise direction of the blade, wherein each first and second reinforcement structure supporting the first and second web includes at least one stack composed of several pultruded composite strips including carbon fibers with the strips being fixed in a resin matrix, wherein each at least one stack composed of the pultruded composite strips is an integral part of the respective first and second web and builds the respective flange, which is attached to the inner layer of the respective upper and lower shell.

A vertical shaft wind turbine that is superior in a rotational startability, even at a low wind speed, and is suited to a wind power generator that has high rotational torque. Each blade is an upper-and-lower-ends fixed type vertically long blade which is suitable for use as a wind turbine or a water turbine. The string length and thickness of an upper-and-lower-ends fixed type vertically long blade (8) that is fixed upper and lower ends to a vertical main shaft (7) gradually decrease from a main part (8) thereof to tips of the upper and lower inwardly curved inclined parts (8B, 8B), and a cross section of the main part (8A) is a lift type. A thickness of the cross-sectional shape is continuously and gradually thins from the main part (8) to the tips of the inwardly curved inclined parts (8B, 8B).

A reinforcing structure for a wind turbine blade is in the form of an elongate stack of layers of pultruded fibrous composite strips supported within a U-shaped channel. The length of each layer is slightly different to create a taper at the ends of the stack; the centre of the stack has five layers, and each end has a single layer. The ends of each layer are chamfered, and the stack is coated with a thin flexible pultruded fibrous composite strip extending the full length of the stack. The reinforcing structure extends along a curved path within the outer shell of the blade. The regions of the outer shell of the blade on either side of the reinforcing structure are filled with structural foam, and the reinforcing structure and the foam are both sandwiched between an inner skin and an outer skin.

A rotor blade for a wind turbine has a rotor blade root defining a reference plane for attachment to a hub. Adjacent to the rotor blade root is a profile region extending to the rotor blade tip. In the profile region, the rotor blade has a blade profile defining a chord. The chord angle between the reference plane and the chord increases over the entire profile region, from the rotor blade root towards the rotor blade tip.

A method of joining first and second blade components of a rotor blade of a wind turbine includes providing corresponding first and second positioning elements at an interface of the first and second blade components. The method also includes aligning and securing the first positioning element of the first blade component with the second positioning element of the second blade component so as to temporarily secure the first and second blade components together. Further, the corresponding first and second positioning elements maintain a desired spacing between the first and second blade components. Moreover, the method includes permanently securing the first and second blade components together such that the desired spacing is maintained between the first and second blade components.

Provided is a wind turbine rotor blade with a rotor blade shell, which envelops an internal volume, and at least one vortex generator in the internal volume.

A rotor blade for a rotor having a vertical rotor shaft provides stream induced driving of the rotor in a direction of driving. The rotor blade includes streaming elements that are arranged successively and at a distance in the direction of driving, wherein each streaming element includes a front edge in the direction of driving and a rear edge in the direction of driving. The rear edge and the front edge are each formed such that, when streamed against by a wind component, it transmits a driving force to the rotor in the direction of driving. Furthermore, a rotor has a rotor blade and a system includes the rotor and an electric machine.

A centrifugal compressor impeller includes a plurality of blades on a front side that extend from a first axial side to an outer radial end of the impeller. The centrifugal impeller includes a back side having a nonlinear backwall. The backwall can include a flat area hear a bore of impeller, a flat area near a tip of the impeller, and a convex surface between the flat areas of the bore and the tip. In some forms the impeller further includes a concave surface between the convex surface and the tip to form an s-shape. A transition or inflection point can denote the change from convex to concave. The convex and/or concave surfaces can take any variety of forms such as constant radius sections and/or compound curves.

A hydrodynamic turbine is described, which comprises: an electric energy generator; a rotor; a rotation shaft having a first end and a second end. Wherein said first end is engaged with said rotor. Said second end of said rotation shaft is coupled to said electric energy generator. Said rotor comprises: a first connection system and a second connection system, each connection system being integrally engaged with said rotation shaft; a first blade module comprising at least two blades, each blade comprising an inner cavity having a substantially rectangular cross-section and being equipped with a first end and a second end. Wherein each connection system comprises a plurality of elongate engagement elements having a substantially rectangular cross-section; each elongate engagement element being coupled to the cavity of a respective blade. Wherein each blade of said first blade module is engaged, at a first end thereof, with said first connection system and, at a second end thereof, with said second connection system.