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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Gas turbine engine shaft face seal with self acting lift augmentation preventing rubbing contact, noting disadvantages of labyrinth and conventional seals
Rotating wickless hollow shaft heat pipe utilizing centrifugal acceleration for return pumping of condensate and transferring high heat fluxes
Electrical output transducer for measuring angular displacements does not introduce frictional contact between stationary and moving parts. It produces output voltages directly proportional to small rotary shaft displacements.
Microelectronic data system mounted on rotating shaft
Parametric design study of self-acting pad geometries for shaft seals in turbocompressors
Steady state characteristics of 1200 Hertz alternator and electrical controls operating in single shaft Brayton cycle power system using krypton gas
Lateral vibrations of rigid rotating shaft in viscous fluid using inner and outer expansions method, considering small amplitude vibration and fast rotation
Rigid rotating cylindrical shaft vibrations along diameter in viscous fluid using inner and outer expansions method
Sealing dam analysis for design of shaft face seal with self-acting lift augmentation for advanced gas turbine engines
Analysis of compressible flow across shaft face seals
Design of shaft face seal with self-acting lift augmentation for gas turbine engines
Physical properties and rotational effects on isothermal compressible flow across shaft seals
Liquid-vapor interface seal design for turbine rotating shafts including helical and molecular pumps and liquid cooling of mercury vapor
Rotational effects on laminar subsonic compressible viscous flow across shaft face seals, noting leakage rates and pressure profiles
Compressible flow across shaft face seals and narrow slots, examining fluid inertia, viscous friction and entrance losses
Shaft riding circumferential seal is used with turbine engines under high pressure conditions. Construction of seal is discussed and schematic diagram to show operations is provided.
Sealing efficiency, service life, and seal loading limits of lip seal for rotating shafts are analyzed. Construction of seal and areas of application are described. Specific advantages of improved lip seal over conventional seals are listed.
Two rotating data systems for engine component testing which demonstrate the techniques of on-the-shaft microelectronic signal conditioning and rotary transformer power- and data-transfer are described. (1) A digital data system provides 69 channels of 1100 C maximum thermocouple data with less than 0.5 percent error from a turbine test rig rotating at speeds up to 9000 rpm. (2) An analog data system amplifies and transfers 72 channels of dynamic strain data with less than 5 percent error from a compressor rig at speeds above 14,000 rpm.