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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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Blunt bodies stagnation point radiation intensity measurements in supersonic flow at very high stagnation temperatures generated by constricted arc heaters
Pressure drop measurements created by spherical particle settling in viscous fluid for wide Reynolds number range
Pulsar CP 1919 observed simultaneously at Arecibo and Stanford, discussing interstellar scintillation as possible explanation for amplitude variations
Solar spectral irradiance measured by airborne instruments, discussing construction, calibration, etc, of photoelectric filter radiometer and Leiss monochromator
Convective plus radiative shock tube model stagnation point heating rate measurements for planetary entry heating rate in air and Venus gas
Digital data acquisition system with ultrahigh sampling rate for Ames electric arc shock tunnel, describing analog to digital conversion, data storage, system performance, etc
A high-altitude electrostatic probe experiment is described and data are presented for three RAM C reentries at velocities of approximately 25 OOO feet per second. The electron density profiles inferred from the probe measurements are compared with theoretical calculations, and the probable cause of significant disagreement is briefly discussed. Probe measurements during material-addition sequences for radio-blackout alleviation are presented, and comparisons of probe measurements with other pertinent diagnostic measurements are made.
Flight tests of cross, modified ringsail, and disk-gap-band parachute deployment performance from low altitudes with structural load data
Regression analysis of cycle life data for long life 20 ampere hour sealed nickel cadmium battery
Convective plus radiative shock tube model stagnation point heating rate measurements for planetary entry heating rate in air and Venus gas
Thermodynamic properties and nozzle flow calculations for high temperature and pressure hydrogen, presenting results in Mollier diagram
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Experiments are described which demonstrated the feasibility of rapidly compressing inert gases in a ballistic piston compressor to simultaneously high temperatures and densities previously unobtainable in the laboratory. With argon, temperatures of the order of 6000 K and accompanying densities of the order of 100 Amagats have been obtained; and with nitrogen, temperatures and densities of 3000 K and 400 Amagats have been approached. Details of the design, assembly, instrumentation, and operating procedures are presented, and the results of mechanical and thermal performance tests up to 5000 atmospheres pressure are described. Emphasis is placed on experiments which demonstrated the usefulness of this apparatus for spectral line broadening studies.
The connection between the Van Kampen and Landau representations of the Vlasov equations has been extended to Fourier-Hermite expansions containing more than 1000 terms by taking advantage of the properties of tridiagonal matrices. These numerical results are regarded as conclusive indications of the nonuniformly convergent behavior of the approximation curve in the limit of an infinite number of terms and represent an extension of work begun by Grant (1967) and by Grant and Feix (1967).
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(For abstract see issue 15, p. 2771, Accession no. A70-32110)
Properties considered for the pure gas are: (1) pressure; (2)temperature,(3) density, (4) enthalpy, (5) speed of sound; (6) entropy, (7) molecular weight ratio, (8) specific heat at constant pressure; (9) specific heat at constant volume; (1) isentropic exponent and (11) species mole fractions.
The viscosities of a number of liquid lubricants and lubricant formulations, determined as function of pressure, temperature, and shear stress by means of a high-pressure capillary viscometer, are reviewed. Where possible, these results are compared with those obtained by other techniques (optical elastohydrodynamics, oscillating crystal, and low shear capillary viscometry).