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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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Heat treatment of molybdenum and its alloys in a reactive atmosphere
Effect of grid and constriction friction on flame propagation velocity, heat exchange and acoustic shock discontinuity formation in reactive media
A program has been conducted at Astronautics to investigate the likelihood of occurrence of the catastrophic oxidation of titanium alloy sheet under conditions which simulate certain cases of accidental failure of the metal while it is in contact with liquid or gaseous oxygen. Three methods of fracturing the metal were used; they consisted of mechanical puncture, tensile fracture of welded joints, and perforation by very high velocity particles. The results of the tests which have been conducted provide further evidence of the reactivity of titanium with liquid and gaseous oxygen. The evidence indicates that the rapid fracturing of titanium sheet while it is in contact with oxygen initiates the catastrophic oxidation reaction. Initiation occurred when the speed of the fracture was some few feet per second, as in both the drop-weight puncture tests and the static tensile fracture tests of welded joints, as well as when the speed was several thousand feet per second, as in the simulated micrometeoroid penetration tests. The slow propagation of a crack, however, did not initiate the reaction. It may logically be concluded that the localized frictional heat of rapid fracture and/or spontaneous oxidation (exothermic) of minute particles emanating from the fracture cause initiation of the reaction. Under conditions of slow fracture, however, the small heat generated may be adequately dissipated and the reaction is not initiated. A portion of the study conducted consisted of investigating various means by which the reaction might be retarded or prevented. Providing a "barrier" at the titanium-oxygen interface consisting of either aluminum metal or a coating of a petroleum base corrosion inhibitor appeared to be only partially effective in retarding the reaction. The accidental puncturing or similar rupturing of thin-walled pressurized oxygen tanks on missiles and space vehicle will usually constitute loss of function, and may sometimes cause their catastrophic destruction by explosive decompression regardless of the type of material used for their construction. In the case of tanks constructed of titanium alloys the added risk is incurred of catastrophic burning of the tanks. In view of this it is recommended that thin-walled tanks constructed of titanium alloys should not be used to contain liquid or gaseous oxygen.
Principal vector and principal moment of reactive and coriolis forces in rocket engines
Effect of particle internal motion in combustion chamber and jet nozzle on principal vector and moment of reactive forces
Large uranium 235 nuclear rockets - reactivity changes during startup by hydrogen density and core temperature variations
Effect of reduced reactivity of organism on resistance to extreme acceleration and radiation
Generation of halogen compounds by pyrolysis, molecule identification by mass spectrometer, and reactivity of fluorine and iodine at cryogenic temperature - dihalomethylenes
Liquid hydrogen and aluminum trimethyl as highly reactive chemical additives in turbojet afterburner to promote fuel combustion process
Slot injection of reactive gases in laminar flow with application to hydrogen dumping into boundary layers of launch vehicles
Low temperature chemical reactivity and synthesis research and applications
Bursting, catastrophic fracturing and chemical reactivity of liquid-filled tanks when impacted by projectiles of high velocity
Launcher for excitation of dominant TM surface waves on axial-cylindrical reactive surface
Air-augmented rocket engine performance prediction requires detailed study of mixing region between reactive gas-particle rocket exhaust and confined airstream
Circuit including feedback control elements automatically corrects the power factor of a reactive load. It maintains power supply efficiency where negative load reactance changes and varies by providing corrective error signals to the control windings of a power supply transformer.
Chemical reactivity of hydrogen, nitrogen, and oxygen atoms at temperatures below 100 deg K
Energy transportation by reflected, surface wave, and radiation fields during excitation of dominant transverse magnetic surface wave on axial-cylindrical reactive surface