Abstract: An adjustable tension foil bearing for a rotatable shaft comprises a bearing housing for the support of a plurality of foil carriers which carry a like plurality of foil elements. The foil carriers are rotatable to effect tensioning of the foil elements.

Abstract: A rotatable toroidal regenerator has a pair of circumferentially spaced annular seals disposed thereabout that separate the hot and cold sections of the regenerator from one another.

Abstract: A spring support and Coulomb damping system for a compliant hydrodynamic gas lubricated bearing comprises a plurality of cylindrical spring elements arranged in a circumferential and axially aligned array for the support of a flexible foil.

Abstract: A self-pressurizing compliant hydrodynamic gas bearing includes a resilient support system having a multi-stage spring arrangement for supporting a flexible foil. The compliant and resilient support system enables the bearing to provide greater load capacity under extreme transient loads while accommodating local thermal distortions, shaft misalignment and runout.

Abstract: A self-pressurizing compliant gas thrust bearing includes a resilient support system having a multi-stage spring arrangement for supporting a flexible foil. The compliant and resilient support system enables the bearing to accomodate extreme transient loads, local thermal distortions, shaft misalignment and runout.

Abstract: An aircraft auxiliary power unit that starts and operates at all operational flight altitudes of an aircraft. The unit can provide constant power output irrespective of altitude and additional power during periods of increased demand.

Abstract: A variable geometry centrifugal compressor diffuser or radial inflow turbine nozzle comprises a plurality of fixed radially extending pressure surface vane segments disposed in a circumferentially spaced array and a plurality of radially movable vane segments abutting said fixed segments for varying the geometry of said diffuser or nozzle.

Abstract: A medium bypass turbofan engine including a fan mounted on a low pressure shaft and positioned at the inlet of the engine; an intermediate pressure single-stage axial compressor carried by the low pressure shaft and positioned to receive a working airstream portion of the air discharged by the fan; a single-stage high pressure centrifugal compressor positioned to receive the output of the intermediate pressure compressor and carried by a high pressure shaft received telescopically over the low pressure shaft; an annular burner positioned to receive the output of the high pressure compressor; an annular slinger carried by the low pressure shaft and arranged to inject fuel into the burner; a high pressure single-stage axial turbine positioned to receive the output of the burner and carried by the high pressure shaft; and a low pressure multi-stage axial turbine positioned to receive the output of the high pressure turbine and carried by the low pressure shaft.

Abstract: An oxygen starting assist system for a gas turbine engine which facilitates lighting or relighting the air-fuel of the engine comprising a tubular element surrounding the spark plug that directs pure oxygen to the tip of the spark plug so as to envelop an arc drawn by the spark plug without passing through the arc.

Abstract: The disclosure relates to a system for the co-generation of steam and electricity from a gaseous fuel. A Brayton cycle turbine drives first and second fuel and air compressors as well as an electric generator. Steam is also produced by the system for direct utilization or to drive a steam turbine which also drives the generator.

Abstract: The disclosure relates to a process for the fabrication of low cost dual property turbine rotors having blades that are diffusion bonded to a blade ring that is simultaneously diffusion bonded to a central hub.

Abstract: The disclosure relates to a turbine rotor and method of manufacture thereof. A plurality of blades having dovetails at the radially inner ends thereof are arranged in a circumferentially spaced circular array. A metallic hub is cast about the dovetails of said blades which are metallurgically bonded by the operation. Alternatively, the blades may be joined to the hub thereafter by an electron beam weld that extends axially to the rotor.

Abstract: The disclosure relates to a turbine rotor and method of manufacture thereof. A plurality of blades having dovetails at the radially inner ends thereof are arranged in a circumferentially spaced circular array. A metallic hub is cast about the dovetails of said blades which are metallurgically bonded by the operation. Alternatively, the blades may be joined to the hub thereafter by an electron beam weld that extends axially to the rotor.

Abstract: A gas turbine engine intended for airborne applications in which several of the main bearings of the engine are contained in a bearing cavity and oil is scavenged from this cavity by allowing air from the high pressure region of the engine to leak into the cavity and then flow downwardly, together with entrained scavenge oil from the cavity, through an oversized cored passage housing a quill shaft driving the accessory gearbox for delivery to a crude separator at the bottom of the gearbox where the air is discharged to a low pressure region of the engine and the deaerated oil is delivered to the inlet of the scavenge pump. The leakage air flow effectively scavenges oil from the bearing cavity in all attitudes of the engine and also induces a flow of scavenge oil from the gearbox during upright operation.

Abstract: The disclosure relates to a method of manufacturing a turbine wheel using an elastomeric mold for the acceptance of powdered metal. The powdered metal is cold isostatically pressed and thereafter heated to effect metallurgical bonding thereof.

Abstract: The disclosure relates to an environmental protection system comprising a Rankine cycle power loop wherein a working fluid is heated by either the combustion of a fuel or by heat exchange from internal combustion engine exhaust. A high frequency turboalternator is driven by the power loop working fluid for the production of high frequency alternating current. An electrically driven Rankine cycle cooling loop uses a second working fluid to effect cooling of a desired media.

Abstract: A casting process for making and utilizing an elastomeric pattern that is coated with a non-metallic material to form a non-metallic shell mold and thereafter removed from the non-metallic shell mold by thermal decomposition or mechanical stripping.

Abstract: The disclosure relates to a process for the fabrication of low cost dual property turbine rotors having blades that are mechanically retained and a blade ring that is permanently bonded to a central hub.

Abstract: The disclosure relates to a method of manufacturing a gas turbine rotor or stator using elastomeric rings for the retention of the rotor or stator blades in a core mold. The elastomeric rings are split to facilitate disassembly thereof from the blade core which is thereafter utilized in a cope and drag casting system.

Abstract: The disclosure relates to a process for manufacturing a ceramic heat exchanger wherein a layer of ceramic material is deposited on a fugitive carbon form by chemical vapor deposition. The carbon form is thereafter burned away from the ceramic material to form a heat exchanger element. A plurality of heat exchanger elements are bonded to one another by chemical vapor deposition to form a homogeneous ceramic heat exchanger.