A two-sided compressor wheel of a fluid compression device includes a first wheel part and a second wheel part. The first wheel part has a plurality of first blades. A first through hole is formed on the first wheel part along a rotation axis, and a first cavity is formed at a bottom of the first wheel part. The second wheel part has a plurality of second blades. A second through hole is formed on the second wheel part along the rotation axis, and communicated with the first through hole. Wherein, the bottom of the first wheel part is connected to a bottom of the second wheel part.

A multi-stage compressor for a turbocharger includes a compressor housing that defines an aperture for receiving a compressor wheel for successively compressing air in first and second stages. First- and second-stage inlets are fluidly connected to the aperture in opposite axial directions, and first- and second-stage volutes extend at least partially annularly therearound so that each volute is configured to receive gas flowing generally radially outward from the compressor wheel. First and second passages fluidly connect the first-stage volute to the second-stage inlet. The passages approach the second-stage inlet from opposite radially inward directions, and are asymmetric with respect to any pair of orthogonal axes having an origin lying on the turbocharger rotary axis as viewed on a transverse cross-section that is normal to the turbocharger axis.

A turbomachine includes a housing, a rotating group that is housed within the housing, and a fluid bearing system with a thrust member. The turbomachine further includes a compressor stage configured to receive a fluid from an area within the housing. Also, the turbomachine includes a seal plate of the housing. The seal plate includes a first face and a second face. The first face has a flow surface that at least partly defines a fluid flow path toward the compressor wheel. The second face has a thrust member support surface configured to support the thrust member during rotation of the rotating group. The seal plate includes an aperture that fluidly connects the area to the fluid flow path.

A turbomachine includes a housing and a rotating group supported for rotation about an axis of rotation within the housing. The rotating group includes a wheel and seal member that is unitary. The wheel and seal member includes a first wheel feature and a second wheel feature that are disposed in a back-to-back arrangement with an outer radial area disposed between the first and second wheel features and facing radially outward from the axis of rotation. The turbomachine also includes a plurality of labyrinthine seal members included on the outer radial area that cooperatively define, with the housing, a labyrinthine seal.

An impeller in which a plurality of vanes are provided so as to overlap each other back and forth as viewed in the direction of axis has a first impeller part on a front side and a second impeller part on a rear side. A method for manufacturing impeller includes a step of molding a first impeller part, a step of molding a second impeller part and a step of combining together the first impeller part and the second impeller part.

A wheel includes a hub portion configured to rotate about a rotational axis. A plurality of blades extends radially outward from the hub portion. Each blade of the plurality of blades includes a leading edge and a trailing edge. The hub portion and the plurality of blades include a substrate metal. The substrate metal includes an aluminum alloy. The aluminum alloy includes, by weight, about 0% to about 0.12% silicon, about 0% to about 0.15% iron, about 1.6% to about 2.4% copper, about 0% to about 0.1% manganese, about 2.2% to about 3.0% magnesium, about 0% to about 0.05% chromium, about 7.3% to about 8.3% zinc, about 0% to about 0.1% titanium, about 0.05% to about 0.15% zirconium, and a balance of aluminum, and other inevitable/unavoidable impurities that are present in trace amounts.

Methods and systems for surge control in a compressor system. A recirculation valve position may be actuated in response to identified conditions of potential surge, determined from a compressor map. Recirculation valve position may be controlled by calculating distance of current operating state to a surge line and using proportional integral control to manage the distance. Compressor speed command may be derated in response to identified surge, determined from one of speed fluctuations of the compressor speed, or variance of a compressor speed tracking error.

An additively manufactured component includes an outer shell, the outer shell enclosing a space therein. An inner lattice structure is in the space of the outer shell. Interspaces are formed in the inner lattice structure. A method of forming an additively manufactured component includes evacuating a chamber in which the additively manufactured component will be formed, and forming in the chamber layer by layer an outer shell enclosing a core. The core includes a lattice structure with interspaces formed in the lattice structure.

A turbomachine includes a housing and a rotating group supported for rotation about an axis of rotation within the housing. The rotating group includes a wheel and seal member that is unitary. The wheel and seal member includes a first wheel feature and a second wheel feature that are disposed in a back-to-back arrangement with an outer radial area disposed between the first and second wheel features and facing radially outward from the axis of rotation. The turbomachine also includes a plurality of labyrinthine seal members included on the outer radial area that cooperatively define, with the housing, a labyrinthine seal.