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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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Critical flow factor is calculated that permits the isentropic mass-flow rate of the gases through critical flow nozzles to be calculated from plenum conditions. Results include nozzle throat velocity, compressibility factor, entropy, enthalpy, specific heat, and ratios of throat to plenum pressure, density, and temperature.
Effects on animals and human beings subjected to prolonged confinement in reduced pressure and high oxygen environments
A Wright GR-1820-G200 cylinder was tested over a wide range of fuel-air ratios at maximum permissible power output as limited by knock with three different degrees of valve cooling. The valves used were stock valves (solid inlet valve and hollow sodium-cooled exhaust valve), hollow valves with no coolant, and hollow valves with flowing water as a coolant. Curves showing the variation in maximum permissible values of inlet-air pressure, indicated mean effective pressure, cylinder charge, and indicated specific fuel consumption with change in fuel-air ratio and valve cooling are shown. The use of valves cooled by a stream of water passing through their hollow interiors permitted indicated mean effective pressures 10 percent higher than the mean effective pressures permissible with stock valves when the engine was operated with fuel-air ratios from 0.055 to 0.065. Operation of the engine with lean mixtures with uncooled hollow valves resulted in power output below the output obtained with the stock valves. The data show an increase in maximum permissible indicated mean effective pressure due to cooling the valves, which averages only 2.1 percent with fuel-air ratios from 0.075 to 0.105.
Effect of oxygen breathing in resorption of gas embolism in vascular system of cats and on course of pulmonary pressure trauma
Effect of random fluctuations in pressure gradient on channel flow
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Axially symmetric dynamic response solutions for cylinders subjected to pressure transients arising in propulsion systems
Users manual for general purpose digital computer program for predicting dynamic response of cylinders subjected to ramp and sinusoidal pressure transients
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Digital computer program determines the dynamic response of circular cylinders subjected to pressure transient forms commonly encountered in propulsion systems. The method can be readily used to obtain solutions for all possible combinations of admissible boundary conditions.
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Pressure dependence of tensile stress-strain behavior of recrystallized powder metallurgy tungsten at environmental pressures of 11 kilobars
Unsteady heat transfer from closed gas system to plane metal surface with periodic pressure and temperature oscillations on gas
Transient temperature distribution in two layer one dimensional slab with initially steady state heat transfer and suddenly changed thermal contact resistances
Computer program obtains the real-gas isentropic flow functions and thermodynamic properties of gases for which the equation of state is known. The program uses FORTRAN 4 subroutines which were designed for calculations of nitrogen and helium. These subroutines are easily modified for calculations of other gases.
Hydrostatic pressure on mechanical behavior of body centered cubic refractory metals and alloys
Tensile strength of alloys under high pressure of hydrogen and helium, discussing embrittlement
Hydrogen environment embrittlement causes failure of hydrogen storage vessels at and below design pressures of 5000 to 6000 psi. Investigation of thirty-five alloys determines their susceptibility to such embrittlement.