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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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Piezoresistive transducer measures gas pressure inside sealed secondary electrochemical cells without breaking the seal. This method is based on the observed fact that the force exerted by the cell faces on the clamp tightening them against the transducer is a function of the gas pressure inside the cell.
Pipe plug for remote installation in an open-ended pipe used in a hazardous environment provides a gastight seal by expanding a rubber seal against the inside surface of the pipe opening, with mechanical clamps contacting the pipe flange for positive retention of the plug.
Hot-gas seal prevents warpage tendencies in large flange joints exposed to high temperatures, such as those present in large space vehicle engine exhausts. Two Inconel wire mesh cores are held in place by an asbestos cloth cover that acts as a spacer to form the seal.
Rotating shaft seals used in space power systems have spiral grooves in one or both of the opposing seal faces. These grooves induce a pumping action which displaces the intervening fluid radially inward toward the shaft and counters the centrifugal forces which tend to displace the fluid outward.
Placing the shaft seals, in an oxidizer pump, between the pump bearings, reduces the shaft overhang length and overall turbopump length. This arrangement of the components in the pump removes the seals from the hot turbine region.
Electron beam welding selectively seals the outer surfaces of porous metal filters and impedances used in fluid flow systems. The outer surface can be sealed by melting a thin outer layer of the porous material with an electron beam so that the melted material fills all surface pores.
Comparison of gas film mainshaft seals with rubbing contract seals for high temperature, high speed, and high pressure gas turbine applications
Floated shoe close running air seals for supersonic jet engine compressors, discussing axial and radial seals design
SNAP 8 alternator noncontacting dynamic seal systems design and tests, obtaining durability and leakage rates comparable to mechanical face seals
Sealing coefficient of visco seal for laminar and turbulent flow, noting Reynolds number effect
Gas turbine compressor end seals, discussing air leakage paths, primary and secondary seals, design and efficiency
Reversed laminar and turbulent flow in flat face seals, determining external fluid exchange across seal land using stream surfaces
High pressure seals for rotating shafts are machined from a polyimide resin. It is more durable and cheaper than the older seals of plastic coated metal and works at temperatures between - 400 degrees and plus 900 degrees f.
Sampling device, by means of a tapered needle, pierces a sealed container while maintaining the seal and either evacuates or pressurizes the container. This device has many applications in the chemical, preservative and battery-manufacturing industries.
Pump and seal parameters for helical groove, hermetically sealed pump and bearing rotor
Gas turbine compressor end seals, discussing air leakage paths, primary and secondary seals, design and efficiency
Face seals for jet engine mainshaft bearing compartments, emphasizing oil film and gas film seals
Gas turbine engine shaft face seal with self acting lift augmentation preventing rubbing contact, noting disadvantages of labyrinth and conventional seals