A vertical axis wind turbine including a nozzle is provided. The nozzle includes a first airfoil and a second airfoil. The first airfoil includes a first airfoil leading edge and a first airfoil trailing edge, and the second airfoil includes a second airfoil leading edge and a second airfoil trailing edge. The nozzle defines an inlet area disposed between the first airfoil leading edge and the second airfoil leading edge and an exit area disposed between the first airfoil trailing edge and the second airfoil trailing edge, wherein the exit area is smaller than the inlet area.

A concentrator nozzle attachment for a blower device is disclosed that increases the airflow velocity of the blower without sacrificing the field of the jetting air. The concentrator nozzle is formed of an outer ring with a centrally located guide surface and is placed at the exit of an air tube. As the air exits the air tube, it's forced to flow around the guide surface, thus increasing its velocity. The attachment is secured to the end of the air tube and so does not alter the outer diameter through which the air exits. In this way, air velocity is increased without reducing its effectiveness.

A centrifugal compressor includes an impeller, a diffuser flow passage forming portion forming an annular diffuser flow passage on a downstream side of the impeller, a plurality of small chord-pitch ratio diffuser blades disposed in the diffuser flow passage at intervals in a circumferential direction of the impeller, and a flow passage dividing annulus extending to the diffuser flow passage along a radial direction of the impeller, and dividing the diffuser flow passage into a hub-side flow passage and a shroud-side flow passage.

An apparatus, system and method to capture water power from head or pressure is provided utilizing pipes, inlets and outlets. The apparatus comprises a central bore having an internal diameter suitable for a fluid flow, the fluid flow moves inside the central bore through the apparatus, and at least one outlet, the fluid flow exits the apparatus through the at least one outlet, optionally, a plurality of inlets for flowing additional fluid to the central bore mix the fluid flow with the additional fluid from the plurality of inlets. The apparatus can further mix the fluid though additional mixing devices and additional devices can be used to recapture energy such as, hydroelectric power from the fluid flow. A system and method to capture water energy from fluid flow is provided.

The invention relates to wind power and allows effectively convert the kinetic energy of the wind, after its (wind) accelerating, to electrical power. The multi-stage wind turbine, which allows multiple accelerate directed air flow (wind), even of most minimal speed, up to strong wind and convert it's energy into electrical power, is proposed. It is achieved due to modularity of installation, where the wind is accelerated within each module due to the processes of capturing the initial wind flow, injection-ejection and aerodynamic Coanda effect as well, by virtual necks and conical confusors nested one into another. The system of truncated cones and virtual necks with optimum aerodynamic sizes provides the capture of the airflow not only perpendicular to the base of these cones, but also from lateral sides of these cones. Moreover, the area of wind flow capturing by lateral surface of this system, depending on the number of stages, several times exceeds the area of wind flow capturing by base of first confusor from side of wind flow. In proposed installation for increase of output power, three parameters are used at relatively small sizes of airscrew. In this case, the wind flow, which is captured by working part of the wind turbine, is compressed by all sides, increasing the speed of the directed airflow, acting on the airscrew. All turbine stages, except the last stage, represent the not full Venturi tubes consisting of a confusors and virtual necks. The last stage represents the classical Venturi tube, consisting of confusor, neck and diffusers. The airscrew is located within the neck of the Venturi tube. Turbine is equipped with a weather vane and means of protection from destruction during hurricane wind.

An airflow guiding device for the sound- and pressure-optimized supply of an airflow to an inlet nozzle of a fan, in particular a radial fan, wherein the inlet nozzle has a nozzle input opening with an incident flow angle, the airflow guiding device having: a frame device which extends along a longitudinal axis in an axial direction with a height between an inlet opening, through which the airflow flows into the frame device in an operating state, and an outlet opening, through which the airflow flows out of the frame device in the operating state, wherein the inlet opening has an inlet cross section with a minimum inlet cross-sectional width, and the outlet opening has an outlet cross section with a minimum outlet cross-sectional width which corresponds to the minimum inlet cross-sectional width or which is smaller than the minimum inlet cross-sectional width, and the frame device comprises a flow duct which connects the inlet opening and the outlet opening in terms of flow, wherein the outlet opening is configured to be connected in terms of flow to the inlet nozzle of the fan in the operating state, characterized in that the height of the frame device according to the following formula h?(D?d)/(2.Math.tan(?)) corresponds to a ratio of a difference of the minimum inlet cross-sectional width and a diameter of the inlet nozzle and double the value of the tangent of the incident flow angle or is greater than the ratio, and a grid element, which is arranged on the inlet opening.

A diffuser for a centrifugal compressor and a centrifugal compressor having the same. The diffuser (100) comprises a drive component (110), a transmission assembly (120), an adjustment assembly (130), a spool valve assembly (140) and a rear wall (150); wherein the transmission assembly is used for transmitting power produced by the drive component to the adjustment assembly, the adjustment assembly is capable of circumferentially reciprocating with respect to the rear wall and driving the spool valve assembly to reciprocate axially; and wherein a rolling element (160) is provided between the adjustment assembly and the rear wall. Intervention of a mechanism for adjusting a flow passage width is better achieved by such an arrangement in combination with an existing configuration of the diffuser; and a low-friction fit between the adjustment assembly and the rear wall is achieved by the rolling element.

Systems and methods related to linear turbine systems are presented. Each embodiment described herein may be designed as a single-stage, linear, impulse turbine system. In an embodiment, a linear turbine includes a first shaft extending along a first axis; a second shaft extending along a second axis, the second axis being separated from and substantially parallel to the first axis; a first plurality of buckets to travel a first continuous path around the first shaft and the second shaft along a first plane, the first path including a first substantially linear path segment between the first axis and the second axis; and a nozzle configured to direct a first fluid jet to contact the first plurality of buckets in the first linear path segment.

Systems and methods related to linear turbine systems are presented. Each embodiment described herein may be designed as a single-stage, linear, impulse turbine system. In an embodiment, a linear turbine includes a first shaft extending along a first axis; a second shaft extending along a second axis, the second axis being separated from and substantially parallel to the first axis; a first plurality of buckets to travel a first continuous path around the first shaft and the second shaft along a first plane, the first path including a first substantially linear path segment between the first axis and the second axis; and a nozzle configured to direct a first fluid jet to contact the first plurality of buckets in the first linear path segment.

A fan assembly may include a base securable to a surface. The base may include a cavity and an inlet in fluid communication with the cavity. The fan assembly may also include a motor assembly disposed in the cavity. The motor assembly may be operable to draw air in through the inlet and into the cavity. The fan assembly may further include a nozzle coupled to the base. The nozzle may define a central axis oriented at an oblique angle relative to the surface and an outlet in fluid communication with the cavity of the base. The outlet may direct the air out of the nozzle in a direction generally parallel to the central axis.