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: An engine fuel system is disclosed for managing drainage of fuel in response to an engine shut-down condition. For normal operation, a piston of a piston assembly is maintained in a first position by pressurized fuel in a volume on a first side of the piston. In response to engine shut-down, pressure is removed from the first side of the piston and fuel in the volume on the first side of the piston is drained into a return conduit that is part of the fuel system's thermal management system. Displacement of the piston in response to removal of pressure on the first side of the piston creates a volume on a second side of the piston for drainage of fuel from a fuel manifold.

Abstract: A fluid cooling arrangement in a gas turbine engine for aerospace propulsion includes an inner structure. Also included is an outer structure disposed radially outwardly of the inner structure, the outer structure and the inner structure defining a bypass flow path. Further included is at least one strut operatively coupling the inner structure to the outer structure. Yet further included is at least one cooling tube formed within the at least one strut, the at least one cooling tube configured to cool a fluid passing through the at least one cooling tube upon convective cooling of the at least one strut as air passes through the bypass flow path and over the at least one strut.

Abstract: A heat exchange device includes a first section and a second section. Each of the first and second sections includes flow passages configured to cool fluid. A center manifold is disposed between the first and second sections. Hot fluid enters the manifold at one end, passes through the first and second sections and cooled fluid exits the manifold at the opposing end. Each of the flow passages can have a bend at an outer edge of the heat exchange device configured to return high pressure fluid to the center manifold.

Abstract: A pump includes first and second gears coupled to one-another for rotation about respective axis. The first gear may include a concentrically disposed first hub portion and a plurality of first teeth radially projecting and circumferentially spaced about the first hub portion. A plurality of first recesses are defined by the first hub portion, communicate radially outward, and are circumferentially distributed about the first hub portion between adjacent teeth of the plurality of first teeth.

Abstract: A gear pump includes a drive gear with drive gear teeth and a driven gear with driven gear teeth. The drive gear is rotatably disposed about a drive gear axis. The driven gear is rotatably disposed about a driven gear axis and is intermeshed with the drive gear such that a plurality of driven gear teeth are in sliding contact with a plurality of the driven gear teeth. One or more of the drive gear teeth or the driven gear teeth define within the tooth interior a cavity. The cavity is in fluid communication through an orifice with an inter-tooth volume defined between the contacting drive gear teeth and driven gear teeth such that fluid flows through the orifice to reduce cavitation within fluid confined within the inter-tooth volume.

Abstract: A disclosed aircraft propulsion system includes a gas turbine engine supported within an aircraft fuselage, a main drive driven by the gas turbine engine and an open rotor propeller system supported outside of the aircraft fuselage separately from the gas turbine engine. A secondary drive that is driven by the main drive drives the open rotor propeller system.

Abstract: A shut-off valve includes a float and a negative G control component. The float is configured to occlude a tank outlet at a first fluid level and 1 G and unocclude the tank outlet at a second fluid level and 1 G. The negative G control component is operatively connected to the float to limit fluid, e.g. liquid or gas, communication between a tank outlet and an ejector pump during negative G events. An ecology fuel return system includes a tank, an ejector pump, a float, and a negative G control component, as described above. The tank has an inlet and an outlet. The inlet is configured to be in fluid communication with components of an engine. The ejector pump is in fluid communication with the tank outlet and is configured to pump fuel from the tank to a fuel pump inlet of an engine.

Abstract: An ecology system includes an ecology tank, a check valve, a shutoff valve, and an ejector pump. The check valve is fluidly connected to the ecology tank and is configured to allow flow from the ecology tank. The shutoff valve is fluidly connected to the check valve, and the ejector pump is fluidly connected to the shutoff valve. The ejector pump is configured to draw fuel from the ecology tank when the shutoff valve is in an open configuration.

Abstract: A fuel system for a gas turbine engine, which includes a combustor section and an actuator, includes a fuel source, a combustor system, and an actuation system. The combustor system includes a combustor pump that is fluidly connected to the fuel source and to the combustor section, with the combustor pump being mechanically connected to and powered by an electric motor. The actuation system includes an actuator pump that is fluidly connected to the fuel source and to the actuator, with the actuator pump being mechanically connected to and powered by a gearbox or an electric motor.

Abstract: A heat exchanger is disclosed including an array of interlaced conduits. The conduit array includes a first plurality of conduits connected to a first inlet header at one end of the first plurality of conduits and to a first outlet header at an opposite end of the first plurality of conduits. This first plurality of conduits provides a first fluid flow path from the first inlet header through the first plurality of conduits to the first outlet header. The conduit array also includes a second plurality of conduits crossing and interlaced with the first plurality of conduits. First and second fluid flow paths are provided through the first and second pluralities of conduits, and a third fluid flow path is through open spaces between the crossed interlaced first and second pluralities of conduits.

Abstract: A heat exchanger is provided having a first fluid circuit defining a first volume and configured to permit a first fluid to flow therethrough with a first fluid supply. The heat exchanger includes a second fluid circuit defining a second volume separate from the first volume and sharing at least one common wall with the first enclosed volume, and configured to permit a second fluid to flow therethrough from a second fluid supply. One or more thermal transfer sheets having one or more channels therein are configured in structural and thermal contact with both the first and second fluid circuits, the channels having a thermodynamic fluid disposed therein and configured to transfer heat between the first fluid circuit and the second fluid circuit. A thermal transfer rate through the at least one common wall is less than a thermal transfer rate of the one or more thermal transfer sheets.

Abstract: A heat exchanger includes a first half defining a first inlet portion and a first outlet portion, a second half defining a second inlet portion and a second outlet portion. The first half and the second half are configured to mate and form an inlet chamber and an outlet chamber. At least one of the first half or the second half includes one or more inlet transfer holes defined through a thickness of at least one of the first inlet portion and/or the second inlet portion. At least one of the first half or the second half includes one or more outlet transfer holes defined through a thickness of at least one of the first outlet portion or the second outlet portion.

Abstract: A shut-off valve includes a float and a negative G control component. The float is configured to occlude a tank outlet at a first fluid level and 1 G and unocclude the tank outlet at a second fluid level and 1 G. The negative G control component is operatively connected to the float to limit fluid, e.g. liquid or gas, communication between a tank outlet and an ejector pump during negative G events. An ecology fuel return system includes a tank, an ejector pump, a float, and a negative G control component, as described above. The tank has an inlet and an outlet. The inlet is configured to be in fluid communication with components of an engine. The ejector pump is in fluid communication with the tank outlet and is configured to pump fuel from the tank to a fuel pump inlet of an engine.

Abstract: A system includes a metering module that receives fluid through a fluid inlet. The metering module includes a rotating component driven by the fluid, an electric machine, and a controller. The fluid is received from the fluid inlet at an inlet flow rate, and the rotating component provides the fluid to an outlet of the rotating component at an outlet pressure. The electric machine is configured to generate electrical power in response to rotation of the rotating component. The controller is powered by the electrical power generated by the electric machine, and controls a rotational speed of the rotating component to control the outlet pressure.

Abstract: A fuel management system may include a first fuel tank and a second fuel tank. The fuel management system may also include an intelligent crossfeed valve positioned between the first fuel tank and the second fuel tank and configured to allow fuel to flow between the first fuel tank and the second fuel tank. The fuel management system may also include a sensor configured to detect an amount to which the intelligent crossfeed valve is open. The fuel management system may also include an engine controller connected to the sensor and configured to cause the intelligent crossfeed valve to close in response to the intelligent crossfeed valve being open a third predetermined amount.

Abstract: A fitting has a threaded insert to be tightened within a housing bore. A first lock ring has an anti-rotation structure on an outer peripheral surface to interfit with anti-rotation structure in a housing. The first lock ring has a face extending generally perpendicular to an axis of the insert, with anti-rotation structure included on the first face. A second lock ring has anti-rotation structure on a face which extends perpendicular to an axis of the threaded insert. The anti-rotation structure on the faces of the first and second lock ring interfit to resist relative rotation of the two. An assembly is also disclosed.

Abstract: A system for controlling actuators within a gas turbine engine according to an exemplary aspect of the present disclosure includes an electronic engine controller, a plurality of actuators, and a central control unit. The central control unit includes an actuator control unit electrically coupled to the electronic engine controller and a plurality of actuator control modules. Each of the actuator control modules is electrically coupled to each of the plurality of actuators. A method is also disclosed.

Abstract: A fuel supplying system includes a primary circuit for delivering fuel from a fuel tank to a primary circuit outlet. The system also includes a first supply circuit connected to the primary circuit outlet, the first supply circuit comprising a first supply circuit pump configured to pump fuel from the primary circuit outlet to engine fuel nozzles. The system further includes a second supply circuit also connected to the primary circuit outlet. The second supply circuit includes at least one actuating device configured to receive power from hydraulic pressure of the fuel. The second supply circuit also includes a second supply circuit pump configured to pump fuel from the primary circuit outlet to an actuating device, wherein the second supply circuit pump is independent from the first supply circuit pump.

Abstract: A shut-off valve system includes a tank having an inlet and an outlet with a flow path defined therebetween. A float within the tank occludes the tank outlet at a first fluid level under positive G forces and unoccludes the tank outlet at a second fluid level under positive G forces. A flow restricting orifice and/or a hydraulic fuse is downstream of float and tank outlet to restrict fluid communication between tank outlet and an ejector pump. A method for restricting flow in an ecology fuel return system includes recovering fuel from engine components, communicating the fuel to an inlet of a fuel tank, pumping the fuel from an outlet of fuel tank to an inlet of an engine when a float within tank unoccludes the outlet of the fuel tank, and restricting fluid flow from tank outlet to an ejector pump with a flow restricting orifice and/or a hydraulic fuse.