A refrigerant compressor according to an exemplary aspect of the present disclosure includes, among other things, an impeller configured to rotate about an axis, and a shroud. The impeller has a plurality of blades. The shroud is secured to the impeller with an adhesive at tips of the plurality of blades.

The invention relates to a side channel compressor (1) for a fuel cell system for conveying and/or compressing a gas, particularly hydrogen, comprising a housing (3) and a drive (6), wherein the housing (3) has a housing upper part (7) and a housing lower part (8), a compressor chamber (30) which is circulating in the housing (3) about an axis of rotation (4) and has at least one peripheral side channel (19), a compressor wheel (2) located in the housing (3), which is rotatably arranged about an axis of rotation (4) and is driven by the drive (6), said compressor wheel (2) comprising blades (5) arranged on the periphery thereof in the region of the compressor chamber (30), and comprising respectively a gas inlet opening (14) embodied on the housing (3) and a gas outlet opening (16) which are fluidically interconnected via the compressor chamber (30), in particular the at least one side channel (19). According to the invention, the drive (6) is designed as an axial field electric motor (6) which has a stator (12) and a rotor (10), wherein the stator (12) and the rotor (10) have a disc-shaped design and are formed so as to move about the axis of rotation (4), and wherein the stator (12) is arranged next to the rotor in the direction of the axis of rotation (4).

A turbine section of a turbomachine includes a housing that houses and supports the rotating group for rotation about an axis. The housing defines a circumferential inlet passage that extends about the axis. The housing defines a turbine wheel upstream area that is disposed downstream of the circumferential inlet passage and upstream of the turbine wheel. The housing defines an outlet that is downstream of the turbine wheel. Furthermore, the turbine section includes a first flow path that extends from the circumferential inlet passage, through the turbine wheel upstream area, across the turbine wheel, to the outlet. Moreover, the turbine section includes a recirculation flow path that extends from the circumferential inlet passage, through the turbine wheel upstream area, and back to the circumferential inlet passage.

Methods for manufacturing an impeller wheel assembly (e.g., an impeller wheel attached to one or more additional components) are provided. In one example, a method includes casting an impeller wheel without a hub feature in a mold and holding the cast impeller wheel in a fixed position using a holding plate during subsequent stages of fabrication (e.g., the addition of a shaft via friction welding).

A rotor of a fluid machine includes a wheel with a plurality of blades. Furthermore, the rotor includes an inter-blade area defined circumferentially between a first blade and a second blade of the plurality of blades with respect to the axis of rotation. Moreover, the rotor includes a balancing mark on the wheel and within the inter-blade area. The balancing mark is elongate and has a first end and a second end. The first end and the second end are stepped axially into the inter-blade area. The balancing mark extends arcuately between the first end and the second end. The balancing mark has a depth that varies as the balancing mark extends arcuately between the first end and the second end. The balancing mark has a width that varies as the balancing mark extends arcuately between the first end and the second end.

Provided are a variable geometry turbine and a supercharger including the same that can change flow rate characteristics of a turbine in accordance with engine output with simple structure and can adjust the flow angle of a fluid flowing into a turbine impeller to any angle in the circumferential direction of the turbine impeller. The variable geometry turbine (10) includes a turbine impeller (12) configured to rotate about an axis line, a turbine housing (30) configured to accommodate the turbine impeller (12) and form a throat passage (32) and a scroll flow channel (34) on the outer circumferential side of the turbine impeller (12), the scroll flow channel (34) communicating with the throat passage (32), and a width changing mechanism in which a width change portion (52) that changes a passage width of the throat passage (32) along the circumferential direction of the turbine impeller (12) is movable in the width direction of the passage width.

A turbocharger turbine wheel can include a hub that includes a rotational axis, a backdisk and a nose, where the rotational axis defines an axial coordinate (z) in a cylindrical coordinate system that includes a radial coordinate (r) and an azimuthal coordinate (Θ) in a direction of intended rotation about the rotational axis; and blades that extend outwardly from the hub, where each of the blades includes an inducer portion and an exducer portion, where, in the inducer portion, in a direction outwardly from the hub, each of the blades includes positive lean angles, a zero lean angle and negative lean angles and where, in the exducer portion, in a direction outwardly from the hub, each of the blades includes negative lean angles, a zero lean angle and positive lean angles.

A gas turbine engine includes a fan, a compressor, a combustor, and a turbine. The compressor compresses gases entering the gas turbine engine. The combustor receives the compressed gases from the compressor and mixes fuel with the compressed gases. The turbine receives the hot, high pressure combustion products created by the combustor by igniting the fuel mixed with the compressed gases. The turbine extracts mechanical work from the hot, high pressure combustion products to drive the fan and compressor.

A centrifugal blower includes a motor located in a motor housing, an impeller, and a volute. The volute directly contacts the motor housing such that the volute is configured to actively cool the motor during operation.

A valve system/method suitable for an internal combustion engine (ICE), compressor pump, vacuum pump, and/or reciprocating mechanical device is disclosed. The system/method is optimized for construction of a two-stroke ICE. The rudimentary system incorporates an intake engine block cover (IEC) and exhaust engine block cover (EEC) that enclose an intake rotary valve cylinder (IVC) and exhaust rotary valve cylinder (EVC) that control intake/exhaust flow through a respective intake rotary valve port (IVP) and an exhaust rotary valve port (EVP) into and out of a combustion cylinder that provides power to a piston and crankshaft. Intake/exhaust multi-staged valves (IMV/EMV) provide intake/exhaust flow control for the IVC/IVP and EVC/EVP. An enhanced system may include a variety of intake/exhaust port seals (IPS/EPS), forced induction/discharge (FIN/FID), centrifugal advance (CAD/ICA/ECA), and/or cooling channel spool (ICS/ECS).