Abstract: In at least one aspect of this disclosure, a shut off valve for an ecology fuel return system can include an inlet for receiving a fluid, an outlet for effusing the fluid, and a valve member configured to move between an open position such that the valve member allows fluid to effuse from the outlet and a closed position such that the valve member prevents fluid from effusing from the outlet. The valve member can include a pressure deflector configured to prevent fluid flow from biasing the valve member toward the closed position.

Abstract: A rotor body for a high-speed generator includes a rotor body with interior and exterior surfaces, a coolant inlet and outlet, and a rotor cooling path for actively cooling the rotor body. The coolant inlet and outlet extend between the interior and exterior surfaces. An interior segment of the rotor cooling path fluidly couples the coolant inlet and coolant outlet and is bounded by the rotor body interior surface. An exterior segment of the cooling path is bounded by the rotor body exterior surface and fluidly couples the coolant outlet an environment external to the rotor body.

Abstract: A bearing carrier has a bearing body including a first material. The bearing body has an exterior surface defining a bridge land with a finger cut and rotatably supports a first and second gear. The first and second gears intermesh with one another for pressurizing fluid traversing the gears between a fluid inlet and a fluid outlet defined in a housing enveloping the bearing carrier. The bridge land is defined in a second material integral with the first material. Methods fabricating a bearing carrier for a gear pump are also disclosed.

Abstract: An exhaust nozzle for a turbine engine includes multiple daisy style corrugations arranged circumferentially about the exhaust nozzle. Each of the daisy style corrugations has a radially inner base portion and multiple lobes protruding radially outward from the base portion.

Abstract: An embodiment of a gear pump arrangement includes a first gear defining a first set of teeth; and a second gear defining a second set of teeth, the first set of teeth and the second set of teeth being in meshed communication such that fluid is pumped in response to rotation of the first gear and the second gear, at least one of the first set of teeth and the second set of teeth having at least one gear tooth passageway through each tooth thereby fluidically connecting opposing faces of the tooth.

Abstract: A tubular heat exchanger includes a first flow path to receive a first fluid flow, wherein the first flow path is defined by a conduit, and a support structure with a plurality of support structure openings, wherein the support structure supports the first flow path, the plurality of support structure openings define a second flow path to receive a second fluid flow, and the first flow path is in thermal communication with the second flow path.

Abstract: Aspects of the disclosure are directed to a thrust reverser of an aircraft, comprising: a wall having a first surface that partially forms a flow channel associated with an air flow, a blocker door having a second surface that partially forms the flow channel, and a dielectric elastomeric device that is configured to selectively expand and contract within a cavity formed between the wall and the blocker door where the cavity is substantially radially adjacent to the flow channel when the thrust reverser is in a stowed state.

Abstract: A power drive unit (PDU) may comprise a first motorized roller comprising an outer rotor having a first magnetic member disposed on a radially inner surface of the outer rotor and may have a liner disposed on a radially outer surface of the outer rotor. The PDU may further comprise an inner rotor having a second magnetic member disposed on a radially outer surface of the inner rotor, the inner rotor configured to drive a shaft. The PDU may further comprise a stator located between the outer rotor and the inner rotor, the stator having at least one winding in electromagnetic communication with the first magnetic member and the second magnetic member. The PDU may further comprise a second motorized roller comprising a cylindrical member coupled to the shaft and may have a second liner disposed on a radially outer surface of the cylindrical member.

Abstract: An aircraft fuel system includes a first pump system that is mechanically driven and in selective fluid communication with a fuel tank and a fuel nozzle of an engine. The first pump system is configured to pump fuel to the fuel nozzles in a high flow rate condition and to be starved or nearly starved of fuel in a low flow rate condition. The aircraft fuel system includes a second pump system including an electric motor. The second pump system is in fluid communication with the fuel tank and the fuel nozzle to pump fuel from the fuel tank to the fuel nozzles. The second pump system is driven by the electric motor and is configured to pump flow in both the high flow rate condition and the low flow rate condition.

Abstract: Controlling BOAS-to-blade-tip clearances by measuring a blade clearance between a first primary BOAS and a blade with a distance measurement device attached to the first primary BOAS, determining if the measured blade clearance of the first primary BOAS is at a value corresponding to a first predetermined blade clearance, measuring a blade clearance of a first secondary BOAS that is circumferentially adjacent the first primary BOAS based on a position of the first primary BOAS when the blade clearance of the first primary BOAS is at the first predetermined blade clearance, determining if the measured blade clearance of the first secondary BOAS is at a value corresponding to the first predetermined blade clearance, and adjusting the position of the first secondary BOAS when the blade clearance of the first secondary BOAS is not at the first predetermined blade clearance with an actuator operably connected to the first secondary BOAS.

Abstract: A motor-generator includes a double-sided stator having a first stator pole wound with a first stator winding of a first channel and a second stator pole wound with a second stator winding of a second channel. The first stator pole and the second stator pole are axially aligned with respect to a centerline of the motor-generator and radially offset between a radially inner side and a radially outer side of the double-sided stator. The motor-generator also includes at least one rotor radially disposed from the double-sided stator with respect to the centerline of the motor-generator.

Abstract: A bearing carrier has a bearing body including a first material. The bearing body has an exterior surface defining a bridge land with a finger cut and rotatably supports a first and second gear. The first and second gears intermesh with one another for pressurizing fluid traversing the gears between a fluid inlet and a fluid outlet defined in a housing enveloping the bearing carrier. The bridge land is defined in a second material integral with the first material.

Abstract: A heat exchanger has a plurality of cells. A first subset of the cells extends for a lesser distance along an axis of the cells and a second subset of the cells extends for a greater axial distance. The second subset of cells extends through separator plates which are positioned beyond axial ends of the first subset of cells. A method is also disclosed.

Abstract: An integrated hybrid emergency power system having various features is disclosed. A hybrid emergency power system may have an auxiliary power unit and an emergency power unit. The emergency power unit may have a fuel cell. The auxiliary power unit may have an engine. The emergency power unit may be connected to the auxiliary power unit by an emergency power unit efficiency improvement apparatus. In this manner, the operating efficiency of the emergency power unit may be enhanced.

Abstract: A valve includes a housing with a mounting portion, a venting portion, and a cap portion. The valve also includes a piston in the housing with a shaft, a disc, and a flange, the piston being moveable between a closed position and an open position. The valve also includes a vessel that is in contact with the cap portion and the flange wherein fluid pressure contained in the vessel biases the piston into one of the opened position and the closed position.

Abstract: A pendulum-type electromagnetic actuator is provided. The actuator includes a curved stationary member comprising a stationary core and a winding wound about the stationary core. A first moving member includes a first moving core and a first plurality of permanent magnets attached to the first moving core, the first moving member is curved and positioned on a first side of the stationary member. A second moving member includes a second moving core and a second plurality of permanent magnets attached to the second moving core, the second moving member is curved and position on a second side of the stationary member, the second side opposite the first side. The actuator further includes a pivot and a pivot connector connecting at least one of the first moving member and the second moving member to the pivot such that the curved moving member rotates about the pivot.

Abstract: A device is disclosed for separating nitrogen and oxygen. The device includes an inlet in fluid communication with a source of a gas comprising oxygen and nitrogen, a membrane having a greater permeability to oxygen than to nitrogen. One side of the membrane is in fluid communication with the inlet, and the other side of the membrane is in fluid communication with an outlet for nitrogen-enriched gas. An outlet for oxygen-enriched gas is also in fluid communication with the first side of the membrane. A porous metal foam is disposed between the inlet and the membrane.

Abstract: A heat exchanger to cool an oil flow with an air flow and a fuel flow includes at least one oil flow layer to receive the oil flow, an air flow layer to receive the air flow, wherein the air flow layer is in thermal communication with the at least one oil flow layer, and a fuel flow layer to receive the fuel flow, wherein the fuel flow layer is in thermal communication with the at least one oil flow layer.

Abstract: A solenoid for a bleed valve includes a solenoid body with an actuation fluid passage, a bleed valve passage, and a drive fluid chamber. A main armature is disposed within the solenoid body and is movable between open and closed positions, the actuation fluid passage being in fluid communication with the control outlet in the open position, the actuation fluid passage being fluidly isolated from the bleed valve passage in the second position. A pilot armature is disposed within the solenoid body, is movable relative to the main armature, and is operably coupled to the main armature by the drive fluid chamber to move the main armature between the open and closed positions by controlling issue of a drive fluid into and out of the drive fluid chamber.

Abstract: A screen element for a fuel system includes a first screen and a second screen. The first screen defines a first aperture and the second screen defines a second aperture. The first aperture and the second aperture are arranged out of circumferential alignment with one another such that a torturous flow path is defined through the apertures for capturing particles smaller than the apertures in a collection cavity defined between the screens.