The present invention relates to a compressor assembly for a turbocharger. The compressor assembly may comprise a spiral housing with a flow channel which is designed to convey a fluid which can be sucked up from outside the compressor assembly, a compressor outlet flange which is fluidically connected to the spiral housing via the flow channel, and an injection device designed to introduce a fluid from outside the compressor assembly into the flow channel, wherein the injection device is arranged outside the flow channel of the spiral housing.

According to the present invention, the impeller inlet of a turbocharger compressor receives intake air from an inner channel and an outer channel. The outer channel is pressurized with an electrically powered secondary compressor. The pressurized air in the outer channel flows into the impeller near the outer wall of the impeller inlet. The pressurized air next to the outer wall of the impeller inlet prevents backflow of air out of the impeller and thereby prevents surge and enables the compressor to produce high boost pressures under small mass flow settings. Only a portion of the intake air is pressurized with the electrically powered secondary compressor, and the boost pressure of the electrical compressor is only a fraction of the turbocharger compressor's overall pressure ratio. Consequently, only a small amount of electrical power is required to drive the secondary compressor, thereby enabling conventional 12 volt batteries to be used to power the electrical compressor for almost all automotive applications.

A turbo-compressor comprises a compressor wheel having an attachment arrangement for attaching the wheel to a drive shaft. The attachment arrangement includes an axially extending spigot internally radially located in a bore in the drive shaft and secured to the drive shaft by fastening means into the rear of the compressor wheel. Thus the compressor wheel expands and tightens into the shaft at speed. Furthermore, the nose of the compressor wheel is free to accept an aerodynamic profile.

An intermediate intake-type diaphragm includes a flow-regulating vane that is provided in an introduction flow channel to regulate a first fluid to flow along the radial direction; and a partition wall that partitions the introduction flow channel and an intermediate suction flow channel in the direction of an axial line. A radially inner end portion of the partition wall is located further on a radially inner side than a radially outer end portion of the flow-regulating vane, and further on a radially outer side than a boundary between the introduction flow channel and a curved flow channel.

Compressor sections of gas turbine engines include a casing, a rotor arranged within with casing, the rotor having a plurality of blades that are rotatable relative to the casing, and a casing treatment applied to the casing. The casing treatment includes a plurality of covered channels each having an inlet and an outlet and a partially covered cavity defined between the inlet and the outlet in an axial direction and between a cover wall and a casing wall in a radial direction relative to an axis through the casing. A core flow through the casing is in a core flow direction and a recirculation flow through the plurality of covered channels is in a recirculation flow direction, the recirculation flow direction being counter to the core flow direction, and the inlet is at a position downstream relative to the outlet in the core flow direction.

An example centrifugal compressor includes a housing that defines an inlet chamber and includes first and second openings that define a recirculation passage in fluid communication with the inlet chamber. An impeller is disposed within the housing and is rotatable about a longitudinal axis to draw fluid into the inlet chamber. The first and second openings are at different axial locations along the longitudinal axis. A plurality of inlet guide vanes are rotatable and situated in the inlet chamber. The centrifugal compressor includes a ring and a controller for moving the ring along the longitudinal axis between a first position and a second position when rotating the inlet guide vanes. The ring obstructs at least one of the first and second openings more in the second position than in the first position.

A centrifugal compressor includes a housing that accommodates a wheel. The housing includes an air intake space formed on an entrance side of the wheel; a flow passage to guide fluid compressed by the wheel to the outside of the housing; a return flow passage opened on each wall surface of the air intake space and the flow passage to circulate a part of the fluid in the flow passage to the air intake space without passing through the wheel; and an introduction portion provided in the air intake space, and having an inner peripheral surface that forms a flow passage to guide the fluid from the outside of the housing to the wheel. A downstream end of the inner peripheral surface in a flowing direction of the fluid is located radially inward of the wall surface of the housing.

Turbomachine casing treatments are described. A turbomachine that includes an example of a turbomachine casing treatment includes a wheel, a casing, and a fluid pressurizer. The wheel has a hub that defines a rotational axis and a plurality of blades. The casing has a first end, a second end, and defines an inner surface that surrounds the plurality of blades, an inlet opening, an outlet opening, a passageway, and a channel that extends from the inlet opening to the outlet opening. The passageway extends from a first passageway opening that is defined on the inner surface and a second passageway opening that is defined on the inner surface and is disposed between the first passageway opening and the first end of the casing. The fluid pressurizer is disposed within the passageway.

The present application proposes an axial turbomachine compressor comprising a rotor with at least one annular row of rotor blades, a stator casing surrounding the row of rotor blades, the casing including a device for generating counter-vortexes. During operation of the compressor, the movement of the blades creates leakage vortexes at the blade tip. The generating device in turn injects counter-vortexes rotating in the opposite direction to the leakage vortexes in order to counter the leakage vortexes. This improves the surge margin of the compressor. The present application also provides a method for controlling the stability of a turbomachine compressor by counter-vortex injection.

A compressor includes a compressor housing defining a cavity, and a compressor wheel disposed in the cavity, the compressor housing defining an inlet for leading air into the compressor wheel, a discharge volute for receiving air compressed by the compressor wheel, and a recirculation duct connected to the inlet at a location upstream of the compressor wheel. A recirculation valve is disposed between the discharge volute and the recirculation duct for regulating air flow through the recirculation duct into the inlet. The recirculation duct defines multiple parallel channels, the multiple parallel channels respectively conducting multiple parallel streams of air from the recirculation valve into the inlet.