An assembly can include a compressor housing, an adjustable wall disposed within the compressor housing that defines an air inlet to an inducer portion of a compressor wheel, and an adjustment mechanism to adjust the wall and thereby adjust at least a diameter of the air inlet. Various other examples of devices, assemblies, systems, methods, etc., are also disclosed.

An actuator system including a harmonic drive operable to drive a variable vane system of a gas turbine engine.

An air cleaner is provided that may include at least one blowing device including a main fan that generates air flow and a first discharge outlet through which air passing through the main fan is discharged; a flow controller movably provided at one side of the at least one blowing device, the flow controller including a sub-fan that generates air flow and a discharge grill through which air passing through the sub-fan is discharged; and a display provided in the discharge grill, the display device displaying operation information.

An exhaust gas turbocharger includes a turbine housing in which a turbine wheel and a guide apparatus that guides an exhaust gas flow to the turbine wheel are disposed. The guide apparatus has two guide grate or screen rings that are rotatable relative to each other and each of which have guide vanes or blades. Conically running flow channels tapering in the direction of the turbine wheel are formed between the guide grate rings.

A regulating rod (1) has a rod part (2) which has an end region (3) provided with an external thread and an end piece (4) which has a receiving recess (5). A knurled nut (6) is arranged and guided in the receiving recess (5) and has an internal thread into which the external thread of the externally threaded end region (3) is screwed. The end piece (4) further has a weld window (8) adjacent the knurled nut. Once the length of the regulating rod is adjusted by rotation of the knurled nut, further rotation of the knurled nut is prevented by introducing and filling the weld window with a weld filler such that the knurled nut (6) is non-detachably fixed and thereby the set length of the regulating rod is fixed.

An apparatus and method of controlling a multi-stage compressor of a gas turbine engine having a front-block of stages with variable stator vanes (VSVs), a rear block of stages downstream of the front-block, and a bleed air off-take from at least one of the stages. The method includes sensing the pressure of the bleed air from the bleed air off-take and adjusting the position of the VSV for the front-block.

A centrifugal refrigerant compressor system includes an impeller connected to a shaft. A diffuser is arranged on a downstream side of the impeller and is configured to regulate refrigerant flow exiting the impeller. A magnetic bearing supports the shaft. A sensing element is configured to produce an output relating to a shaft condition. A controller is configured to receive the output and determine an undesired impeller operating condition based upon the shaft condition. The controller is configured to command the diffuser to a desired state in response to the undesired impeller operating condition.

A system for tracking a user. In some embodiments, the system includes a user-tracking circuit, configured to determine a direction to the user, and a pointing control circuit, for causing a payload to be aimed based on the direction to the user.

A guide vane within an annular inlet duct of a gas-turbine engine provides for generating swirl within an annular inlet duct so as to provide for reducing the rate of deceleration of the inlet air flow within the annular inlet duct while providing for diffusion of the meridional component of velocity thereof.

An airflow-generating device which can adjust an air chamber volume and a method applied thereto are provided. The device has a volume-adjustable air chamber and an airflow-generating unit. The volume-adjustable air chamber has an inlet structure, an outlet structure, and an adjustment unit. A deflector structure for adjusting pressure or direction of airflow is arranged in the outlet structure, and an air chamber space is formed between the inlet structure and the outlet structure. The adjustment unit is used to adjust an inlet-outlet distance between the inlet structure and the outlet structure for adjusting the volume of the air chamber. The airflow-generating unit is arranged in the volume-adjustable air chamber and used to generate the airflow introduced from the inlet structure into the air chamber space and exhausted from the outlet structure. The present disclosed example can increase the intensity or reduce the noise of the airflow.