Measurements of leakage in mechanical face seals.
Leakage in mechanical face seals with hydrodynamic films, noting misaligned seal theories for pumping with cavities and two fluids
Findlay, J. A.↗
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Computer program for analysis of flow across a gas turbine seal
Computer program analyzes the flow /leakage/ across a sealing dam for the case of steady, laminar, subsonic, isothermal, compressible flow. The analysis considers both parallel sealing-dam surfaces and surfaces with small tilt angles.
Smith, P. J.↗
Measurements of leakage in mechanical face seals
Leakage in mechanical face seals with hydrodynamic films, noting misaligned seal theories for pumping with cavities and two fluids
Findlay, J. A.↗
High-temperature, long-life polyimide seals for hydraulic actuator rods
Two types of polyimide seals are developed for hydraulic actuator rod in low pressure second stage of two-stage configuration. Each seal melts test objectives of twenty million cycles of operation at 534 K. Analytical and experimental study results are discussed. Potential applications are given.
Johnson, R. L.↗
Hermetically sealed motion transmitter
Transmitter allows transmission of rotational or single planar arc motion through hermetically sealed chamber without use of dynamic seals or complex mechanisms. Device may interest pressure vessel designers and those who need to isolate equipment from a hostile environment.
Eckert, R. L.↗
High temperature autoclave vacuum seals
Aluminum sheet forms effective sealing film at temperatures up to 728 K. Soft aluminum wire rings provide positive seal between foil and platen. For applications at temperatures above aluminum's service temperature, stainless steel is used as film material and copper wire as sealant.
Hoffman, J. R.↗
Development of mainshaft seals for advanced air breathing propulsion systems, phase 2 Final report
Design and performance of gas-film and oil-film lubricated self sealing mainshaft seals for gas turbine engines
Mckibbin, A. H.↗
Design and experimental evaluation of a turbopump lift-off seal Final report
Hydrostatic life-off seal zero leakage and static sealing and rubbing tests for use in liquid hydrogen turbine pumps
Ritter, J. A.↗
Evaluation of DuPont LRU 488 as a seat seal material in the Marquardt R4D engine valve Test report
Seal surface profiles of DuPont LRU 488 molded elastomeric seat seals
Lynch, R.↗
High-speed, self-acting shaft seal (circumferential type)
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.
Ludwig, L. P.↗
Computer Program for Calculating the Temperature Field of Face Seals
FORTRAN 4 program for use on IBM 7094 computer for calculating temperature field of shaft seals is described. Shaft seals are composed of basically axisymmetric bodies. Cylindrical coordinate system is used as basis for analysis. Program is quite general and can be applied to variety of axisymmetric body problems.
Russell, T. E.↗
Computer program calculates quasi-one-dimensional flow across face seals and narrow slots
Program calculates mass and volume leakage across seal; mean friction factor; force; center of pressure; and distributions of pressure, temperature, density, friction parameter, velocity, and Mach number across seal for both laminar flow and turbulent flow regimes and for choked and subsonic flow.
Zuk, J.↗
Low-closing-force seal
Compress soft, inert metal gasket between cone and corresponding socket to attach tubes to vessels containing gas samples. Technique effects seals with minimum of applied force and does not contaminate contents. Seal is formed when port connector is pushed firmly into its socket. Gold washer is deformed and forced to flow into imperfections in surfaces.
Bergquist, L. E.↗
Low-temperture electrostatic silicon-to-silicon seals using sputtered borosilicate glass
Silicon members are hermetically sealed to each other. Process produces no measurable deformation of silicon surfaces and is compatible with package designs of tight tolerance. Seals have been made with glass coatings in 10-mm to 20-mm thickness range without any prior annealing of coated silicon substrates.
Hardesty, C. A.↗
Fabrication and testing of negative-limited sealed nickel-cadmium cells
The design, construction, and testing of 100,20Ah and 100,3Ah negative-limited sealed cells are reported. The required physical dimensions of the hardware and components necessary to produce 20 and 3 Ah cells were established. The stainless steel cans and covers have been ordered. The covers contain two ceramic seals. The fabrication of electrodes was started. About 55% (879 electrodes) of the required cadmium electrodes has been prepared. About 44% of the porous nickel substrates (plaques) required for the preparation of the nickel oxide electrodes has been completed.
Luksha, E.↗
Engineering report. Part 1: NASA wheel air seal development for space shuttle type environmental requirements
The sealing techniques are studied for existing aircraft wheel-tire designs to meet the hard vacuum .00001 torr and cold temperature -65 F requirements of space travel. The investigation covers the use of existing wheel seal designs.
Source record↗
Computer program for quasi-one-dimensional compressible flow with area change and friction - Application to gas film seals
A computer program is presented for compressible fluid flow with friction and area change. The program carries out a quasi-one-dimensional flow analysis which is valid for laminar and turbulent flows under both subsonic and choked flow conditions. The program was written to be applied to gas film seals. The area-change analysis should prove useful for choked flow conditions with small mean thickness, as well as for face seals where radial area change is significant. The program is written in FORTRAN 4.
Zuk, J.↗
Study of process variables associated with manufacturing hermetically-sealed nickel-cadmium cells
A two year study of the major process variables associated with the manufacturing process for sealed, nickel-cadmium, areospace cells is summarized. Effort was directed toward identifying the major process variables associated with a manufacturing process, experimentally assessing each variable's effect, and imposing the necessary changes (optimization) and controls for the critical process variables to improve results and uniformity. A critical process variable associated with the sintered nickel plaque manufacturing process was identified as the manual forming operation. Critical process variables identified with the positive electrode impregnation/polarization process were impregnation solution temperature, free acid content, vacuum impregnation, and sintered plaque strength. Positive and negative electrodes were identified as a major source of carbonate contamination in sealed cells.
Miller, L.↗