Patent application number | Description | Published |
20080236939 | Exhaust silencer assembly - An exhaust silencer assembly for use with a gas turbine engine, the exhaust silencer assembly comprising an exhaust duct extension disposed downstream from an exhaust diffuser of the gas turbine engine, and an exhaust silencer disposed downstream from the exhaust duct extension. The exhaust duct extension has a length that is at least about 50% of an inner diameter of the exhaust duct extension. | 10-02-2008 |
20090078496 | Mixed-flow exhaust silencer assembly - An exhaust silencer assembly comprising a casing having an exhaust gas entrance opening, an exhaust gas exit opening, and a cooling air inlet opening, and an acoustic-attenuating porous liner disposed within an interior chamber of the casing, thereby dividing the interior chamber into an inner region located between the exhaust gas entrance opening and the exhaust gas exit opening, and an outer region located between the acoustic-attenuating porous liner and the casing, where the cooling air inlet opening is located at the outer region. | 03-26-2009 |
20090152406 | ROTATING AUXILIARY POWER UNIT AIR INLET DOOR - An inlet door assembly includes an inlet door rotatable about an axis of rotation. | 06-18-2009 |
20110271686 | EXHAUST SILENCER CONVECTION COOLING - An example auxiliary power unit (APU) exhaust silencer includes cooling features to protect the outer skin and other components from heat generated by gases passing through an exhaust duct. Cooling air flow through a cooling air passage in thermal contact with the exhaust silencer carries heat away from other nearby components and the aircraft skin. | 11-10-2011 |
20120096772 | Door System - A door system for an inlet comprises: a first door hinged to face a first direction that covers a portion of the inlet; a second door, adjacent to the first door, hinged to face a second direction opposite the first direction that covers the remainder of the inlet; and an actuator system that operates the doors in selectable door system states comprising: first door closed and second door closed; first door opened and second door closed; first door opened and second door opened; and first door closed and second door opened. | 04-26-2012 |
20120102910 | High Flow Eductor - An exhaust eductor for a gas turbine engine comprises: an engine exhaust chamber with an exhaust chamber inlet that receives engine exhaust from the gas turbine engine and an exhaust chamber outlet that discharges the engine exhaust to establish an exhaust gas flow through the engine exhaust chamber; an air chamber with an air inlet that receives ambient air external to the gas turbine engine; and a mixing baffle that couples the air chamber to the engine exhaust chamber, comprising a first side adjacent the air chamber, a second side adjacent the exhaust chamber, multiple apertures through the mixing baffle that extend from the first side to the second side of the mixing baffle, each aperture having a corresponding canopy that extends from an upstream end of the aperture along the second side of the mixing baffle into the exhaust gas flow for at least a portion of the length of the aperture, to establish an air flow from the air inlet of the air chamber into the exhaust gas flow. | 05-03-2012 |
20120167579 | FUEL ANTI-ICING AND APU COMPARTMENT DRAIN COMBINATION - A heat exchanger has a first passage to be connected to a source of fuel. The heat exchanger has an outlet to communicate the fuel downstream. A second passage connects to a source of air. The air passes adjacent to the first passage to heat fuel in the first passage. A jet pump is positioned downstream of the second passage to receive air from the second passage. The jet pump includes a tap connected to a housing compartment to drain fluid from the compartment. A method is also disclosed. | 07-05-2012 |
20120174595 | ARRANGEMENT FOR MAINTAINING FLOW TO AN AIR INLET OF AN AUXILIARY POWER UNIT ASSEMBLY - An example auxiliary power unit air inlet assembly includes a noise attenuating component disposed within a conduit. The conduit is configured to communicate a first flow of fluid to an auxiliary power unit. A second flow of fluid is communicated to the noise attenuating component. The second flow of fluid limits formation of ice in the conduit. The first flow of fluid is different than the second flow of fluid. | 07-12-2012 |
20120180498 | ANTI-WINDMILLING STARTER GENERATOR - An APU has a gas turbine engine and a starter generator to be selectively driven by the gas turbine engine. A sensor senses windmilling of components associated with the starter generator. A lock feature limits rotation within the starter generator when windmilling is sensed. A method of operation is also disclosed. | 07-19-2012 |
20120273611 | EXHAUST SILENCER WITH BAFFLES - An exhaust silencer assembly includes an exhaust duct and an exhaust silencer. The exhaust silencer is disposed about the exhaust duct and has a plurality of solid baffles and at least one perforated baffle The exhaust silencer assembly is disposed downstream of an auxiliary power unit and at least partially attenuates the downstream noise of the combustion gases that result from operation of the auxiliary power unit. In one embodiment, at least one of the plurality of solid baffles is disposed to extend axially between generally radially extending solid baffles, perforated baffle(s), or partially perforated baffles. The axially extending solid baffle allows for cavity depth variation in the silencer to optimize tuning of particular frequencies from the auxiliary power unit. | 11-01-2012 |
20120275935 | Inlet Plenum with Shock Wave Suppression - An inlet plenum for a compressor that suppresses acoustic shock waves generated by the compressor, which inlet plenum has an inlet duct with a wall that surrounds an air flow path between a mouth of the inlet plenum and the compressor, comprises: at least one cavity that penetrates an inner surface of the wall, circumscribes the inner surface generally transversely to the air flow path and has a position along the air flow path that is generally coincident with at least one constructive interference peak of the acoustic shock waves along the inner surface; a width of the cavity along the direction of the air flow that is less than or equal to the wavelength of at least one of the acoustic shock waves; and a depth of the cavity generally perpendicular to the direction of the air flow that approximates a multiple of a quarter wavelength of at least one of the acoustic shock waves. | 11-01-2012 |
20120288373 | ROTOR WITH ASYMMETRIC BLADE SPACING - A turbine apparatus comprises a rotor with a hub section defined about a rotational axis and a plurality of blades attached to the hub section. The plurality of blades comprises a first group having a first angular spacing in a first circumferential sector of the rotor, and a second group having a second angular spacing in a second circumferential sector of the rotor. The first angular spacing is different from the second angular spacing, and the rotor blades are asymmetric about the rotational axis. | 11-15-2012 |
20120323531 | ENGINE NOISE MONITORING AS ENGINE HEALTH MANAGEMENT TOOL - A system and method are provided for determining the health of an engine. The method includes a plurality of standard noise spectra collected from engines with known defects. A noise spectrum of the engine being monitored is sensed and compared to the plurality of standard noise spectra from the engines with known defects. From the comparison, a type and a degree of defect is identified based upon the comparison. | 12-20-2012 |
20130001009 | EDUCTOR EXHAUST SILENCER ASSEMBLY WITH BYPASS GASFLOW - An exhaust silencer assembly for use with an auxiliary power unit includes an eductor and a discharge pipe. The eductor is disposed downstream of the auxiliary power unit and has an entrance opening at a forward axial end thereof. The entrance opening is configured to receive exhaust airflow from the auxiliary power unit. The discharge pipe extends from the auxiliary power unit and communicates with the exhaust silencer assembly downstream of the entrance opening of the eductor. | 01-03-2013 |
20130091850 | METHOD AND SYSTEM FOR REDUCING HOT SOAKBACK - A method for cooling a gas turbine engine includes supplying power to a motor to generate mechanical motion and translating the mechanical motion of the motor to a shaft of the gas turbine engine to rotate a compressor stage and a turbine stage after the engine has been shutdown to circulate air within the engine and cool engine components. A system for preventing hot soakback in an auxiliary power unit includes a starter motor, a compressor, a turbine, a shaft connected to at least one stage of the compressor and at least one stage of the turbine, a gearbox for connecting the starter motor to the shaft, a temperature sensor and a controller. The controller receives information from the temperature sensor and instructs the starter motor to rotate and drive the shaft when the temperature sensor senses a temperature above a low limit temperature threshold. | 04-18-2013 |
20130236288 | BLEED NOISE REDUCTION - An assembly for reducing compressor noise includes a compressor and an acoustic shield. The compressor has a rotor with a plurality of blades mounted thereto. Additionally, the compressor has one or more bleed slots therein. The acoustic shield is disposed adjacent to the one more bleed slots and spaced at a distance therefrom. | 09-12-2013 |
20130274023 | SHAFT WITH SHOULDER AND GROOVE - A shaft includes a shoulder that transitions the shaft from a first diameter to a second diameter. The shaft includes a groove that is disposed immediately adjacent to and/or is formed in an inner radial portion of the shoulder. The groove acts to produce uniform deflection of the shoulder in an axial direction with respect to a centerline axis of the shaft. | 10-17-2013 |
20130280027 | ANTI-VORTEX SHEDDING GENERATOR FOR APU SUPPORT - An assembly for use with a power-producing unit includes an annular case, a hub positioned radially inward of the case, a fluidic flow path defined between the case and the hub, a plurality of support tubes each extending between the case and the hub, and a flow modifying structure positioned on an exterior surface of at least a first one of the support tubes and configured to reduce vortex shedding of a passing fluid. | 10-24-2013 |