Calculation of the hydraulic resistance of annular channels
Flow resistance equations for turbulent annular flow
Finatev, Yu. P.↗
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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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Experimental study of the heat transfer and hydraulic resistance in the entry section of a flat channel during laminar flow of a viscous liquid
Heat transfer and flow resistance in inlet section of flat channel during laminar viscous flow
Zhukauskas, A. A.↗
Hydraulic characteristics of spatially varied flow in a trapezoidal channel.
Dynamic equation for spatially varied flow in trapezoidal channel derived from principle of momentum conservation
Mirza, S.↗
Development of design criteria and performance improvement techniques for a low temperature hydraulic servo system Final report
Servovalve design for low temperature space applications
Source record↗
Hydraulic brake safety valve
Safety device, consisting of three separate fluid chambers, insures that two wheels of a brake system continue to function if a failure occurs.
Hobson, Z. A.↗
Wake analysis for supersonic decelerator applications. Volume 2 - Application of gas-hydraulic analogy to shallow-water tow channel results
Shallow water tow channel used to study two dimensional compressible wake of supersonic decelerator
Lau, R. A.↗
Analysis of a test method for measuring resonant frequencies of loaded hydraulic feed lines
Analysis of test facility for measuring resonant frequencies of fluid feed lines
Reis, G. C.↗
Evaluation of hydraulic fluids for use in advanced supersonic aircraft
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Damasco, F.↗
Hydraulically operated tilt table
Table raises, lowers, or tilts test subject from vertical through an angle of 105 deg to a head-down position of 15 deg. Table is designed for medical center or laboratory use. Additional features are described.
Gause, R. L.↗
Hydraulic expansion process shapes large metal sheets
Process imparts dome shape to titanium sheets and is applicable to shaping other metals. Method is of interest to automobile and aircraft body manufacturers.
Anderson, E.↗
Hydraulic valve lifter remover
Threaded rod, mounted in tubular housing which is flanged and expandable at one end, removes valve lifter after removal of valve covers and push rods.
Horton, R. F.↗
Cavitation data for hydraulic equipment
Development of cavitation B-factors for helium, parahydrogen, nitrogen, fluorine, oxygen, refrigerant 114, and water is discussed. B-factor is defined and numerical relationships are established. Mathematical models are included and alternative methods of determining B-factor are explained.
Hord, J.↗
Development and testing of improved polyimide actuator rod seals at higher temperatures for use in advanced aircraft hydraulic systems
Polyimide second stage rod seals were evaluated to determine their suitability for application in advanced aircraft systems. The configurations of the seals are described. The conditions of the life cycle tests are provided. It was determined that external rod seal leakage was within prescribed limits and that the seals showed no signs of structural degradation.
Robinson, E. D.↗
Testing of improved polyimide actuator rod seals at high temperature and under vacuum conditions for use in advanced aircraft hydraulic systems
Polyimide second-stage rod seals were evaluated to determine their suitability for applications in space station environments. The 6.35-cm (2.5-in.)K-section seal was verified for thermal cycling operation between room temperature and 478 K (400 F) and for operation in a 133 micron PA(0.000001 mm Hg) vacuum environment. The test seal completed the scheduled 96 thermal cycles and 1438 hr in vacuum with external rod seal leakage well within the maximum allowable of two drops per 25 actuation cycles. At program completion, the seals showed no signs of structural degradation. Posttest inspection showed the seals retained a snug fit against the shaft and housing walls, indicating additional wear life capability. Evaluation of a molecular flow section during vacuum testing, to inhibit fluid loss through vaporization, showed it to be beneficial with MIL-H-5606, a petroleum-base fluid, in comparison with MIL-H-83282, a synthetic hydrocarbon-base fluid.
Sellereite, B. K.↗
Hydraulic concentration of magnetic fields in the solar photosphere. II - Bernoulli effect
The magnetic filaments in the solar photosphere are subject to vigorous kneading and massaging by the convective turbulence at, and beneath, the visible surface. It is shown that the Bernoulli effect of the consequent surging of fluid up and down along the filaments is a major factor in concentrating the magnetic pressure of the filament (the mean square field). The mean field is also increased if the phase velocity of the external massaging exceeds the Alfven speed within the filament. The net observational magnetic result of the surging, then, depends upon the response of the observing instrument, and whether it essentially observes the mean field, the rms field, or whether there are saturation effects. It is suggested that the chromospheric mottles (spicules) seen in H alpha are in fact the intense magnetic filaments that carry most of the magnetic flux across the photospheric boundary of the sun.
Parker, E. N.↗
Fail-safe hydraulic shaker protection
Nine channel system controls acceleration and force on structure undergoing vibration stress testing. System has automatic and manually operative abort feature.
Woodbury, R. C.↗
Effect of tip clearance on performance of small axial hydraulic turbine
The first two stages of a six stage liquid oxygen turbine were tested in water. One and two stage performance was determined for one shrouded and two unshrouded blade end configurations over ranges of clearance and blade-jet speed ratio. First stage, two stage, and second stage efficiencies are included as well as the effect of clearance on mass flow for two stage operation.
Boynton, J. L.↗
Testing of molded high temperature plastic actuator road seals for use in advanced aircraft hydraulic systems
Molded high temperature plastic first and second stage rod seal elements were evaluated in seal assemblies to determine performance characteristics. These characteristics were compared with the performance of machined seal elements. The 6.35 cm second stage Chevron seal assembly was tested using molded Chevrons fabricated from five molding materials. Impulse screening tests conducted over a range of 311 K to 478 K revealed thermal setting deficiencies in the aromatic polyimide molding materials. Seal elements fabricated from aromatic copolyester materials structurally failed during impulse cycle calibration. Endurance testing of 3.85 million cycles at 450 K using MIL-H-83283 fluid showed poorer seal performance with the unfilled aromatic polyimide material than had been attained with seals machined from Vespel SP-21 material. The 6.35 cm first stage step-cut compression loaded seal ring fabricated from copolyester injection molding material failed structurally during impulse cycle calibration. Molding of complex shape rod seals was shown to be a potentially controllable technique, but additional molding material property testing is recommended.
Waterman, A. W.↗