A noise reduction structure of a supercharger, comprising: a relief channel of the supercharger having a high pressure pipeline and a low pressure pipeline; a silencing assembly which is arranged at a gas communication position between the high pressure pipeline and the low pressure pipeline. The silencing assembly has a plurality of vent holes with a hole diameter smaller than 20 mm, and the silencing assembly is configured in such a way that the high pressure gas only enters the low pressure pipeline after passing through the vent holes when the high pressure pipeline is in communication with the low pressure pipeline. The noise reduction structure of the supercharger mentioned above has good effect of noise elimination during gas release and low costs.

A compressor control system includes a compressor compressing a fluid, an anti-surge valve preventing backflow in the compressor, the anti-surge valve being arranged on a line connecting an inlet and an outlet of the compressor and operated by a first signal, an inlet guide vane controlling an opening area of the inlet, the inlet guide vane being arranged at the inlet and operated by a second signal, and a controller connected to the anti-surge valve and the inlet guide vane and generating the first signal to control the anti-surge valve, a vane control signal to control the inlet guide vane, a pressure compensation signal to control the inlet guide vane to compensate for a change in pressure at the outlet of the compressor according to the first signal, and the second signal by combining the pressure compensation signal with the vane control signal.

A heat transfer system includes a heat exchanger located at least partially within a coolant flowpath. The heat exchanger defines at least in part a first flowpath and a second flowpath, the first flowpath configured to be in fluid communication with the coolant flowpath, and the second flowpath configured to receive a flow of a motive fluid. The heat transfer system further includes a throttling device that is in fluid communication with the second flowpath of the heat exchanger. The heat exchanger receives at least a portion of the flow of the motive fluid from the heat exchanger. The throttling device is also in fluid communication with the coolant flowpath at a location upstream of the heat exchanger for providing the flow of motive fluid to the coolant flowpath at the location upstream of the heat exchanger.

A hybrid propulsion system extracts electrical power using a combined heat engine and electrical generator. The propulsion system includes a gas generator, an electrical power generator disposed upstream of the gas generator and configured to be driven by a power turbine, an output power shaft mated to the power turbine and extending through a central axis of the gas generator and power generator unit, an engine enclosure circumferentially surrounding the power generator, and a shroud disposed between the power generator and the engine enclosure. The electrical power generator includes at least one rotating member and a stationary conductive member. The at least one rotating member includes a magnetic portion, and rotation of the at least one rotating member relative to stationary conductive member generates a current transmissible by one or more coupled power output cables.

A gas turbine includes a compressor, a combustor, a turbine, a generator, and a control apparatus, the compressor being provided with an air extraction valves, a plurality of inlet guide vanes, and a plurality of casing air extraction valves at its last stage, in which the control is carried out on at least one of the opening of the air extraction valve, the opening of the inlet guide vanes, and the number of openings of the casing air extraction valves which are defined as control parameters taking blade vibration stress values as indexes based on a compressor metal temperature included in behavior parameters of the gas turbine.

There is disclosed a centrifugal compressor including an impeller rotatable about an axis and a diffuser downstream of the impeller. The diffuser has walls delimiting flow passages. Plasma actuators are positioned adjacent the walls and are operatively connectable to a source of electricity. The plasma actuators have a first electrode, a second electrode, and a dielectric layer therebetween. The first electrode is upstream of the second electrode. The first electrode is exposed to the flow passage. The second electrode is shielded from the flow passage by the dielectric layer. The plasma actuators are operable to generate an electric field through the dielectric layer. The plasma actuators are located closer to inlets of the flow passage than to outlets of the flow passages. A method of operating the compressor is disclosed.

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.

Compressor for charging a combustion engine, comprising a compressor housing (1) with a volute (2), a compressor wheel (3) being arranged in the compressor housing (1), the compressor wheel (3) turning about an axis (A) and transporting gas into the volute (2), and an inlet channel (4), at least an end portion of the inlet channel (4) being oriented in the direction of the axis (A) in order to direct gas towards the compressor wheel in the axial direction, wherein an exhaust gas channel (5) terminates into the inlet channel (4) upstream of the compressor wheel (3), and wherein the exhaust gas channel (5) can be shut off by means of a valve (6), wherein a housing (8) of a driving device (7) of the valve (6) is integrally formed with the compressor housing (1).

A method of controlling a gas turbine engine capable of operating in at least a high output power range, a medium-high output power range, a medium-low output power range and a low output power range. The method includes during the medium-high output power range bleeding a gas from a downstream part of the compressor to an upstream part of the compressor so that a first predetermined temperature of the combustor is maintained, during the medium-low output power range bleeding a gas from a downstream part of the compressor to an upstream part of the compressor and bleeding a gas from the downstream part of the compressor to the exhaust so that a second predetermined temperature of the combustor is maintained.

A controller operates to control a gas turbine engine which has a first variable guide vane axially spaced apart from a compressor blade array and is rotatably mounted at a first location on a casing, having a vane axis of rotation at right angles to an operational axis. An adjustment drive is operable to rotate the first variable guide vane about its axis of rotation to a range of angles relative to the operational axis. The controller is operable to control the rotation of the first variable guide vane in dependence of engine shaft speed, wherein over a first range of engine shaft speed the angle of the first variable guide vane relative to the operational axis decreases with increasing engine speed, and over a second range of engine shaft speeds, the angle of the first variable guide vane relative to the operational axis increases with increasing engine speed.