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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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Establishing an arc between water-cooled tungsten-tipped electrodes, maintaining the arc along the centerline of a central jet of argon gas, and surrounding the argon jet with a coaxial sheath of nitrogen stabilizes operation of a low-frequency ac electric arc.
Reducing the pressure in the vicinity of the arc attachment point by allowing the gas to flow through a supersonic nozzle minimizes local heating rates, prevents ablation, and increases the efficiency of coaxial gas-flow arcs.
Gage permits determination of stagnation conductivity from measurement of shunt impedance presented by the plasma between the inner and outer conductors of a segment of coaxial transmission line. Response of gage permits its use in shock-tube work and research on explosive propagation.
Modified single-shaft turbopump incorporates inducer and main pump, each separately driven at different speeds through coaxial-shaft arrangement. Inducer operates at low speed for low net positive suction pressure, main pump operates at high speed to generate high pressure. This arrangement requires no external control for the inducer.
Far field noise generation from interacting coaxial jet flows, and nozzle operational modes
Flash lamp-pumped organic dye scintillator lasers using coaxial Xe-filled lamp, tabulating blue- violet organic liquid lasers characteristics
Interacting coaxial supersonic jet flows noise reduction based on noise distribution characteristics measurement in anechoic chamber
Quasi-steady coaxial MPD arcs characteristics, studying Ar ion velocities, electrostatic ion acceleration mechanism and arc voltage gradient
Quasi-steady state plasma acceleration in coaxial electrode geometry during synchronized application of tailored pulses of mass flow and current
Nuclear light bulb and coaxial flow gaseous core nuclear rocket reactors based on energy transfer via thermal radiation
Simple integrated circuit located at transducer, enables use of single coaxial cable for both input and output connections. Circuit is sensitive to changes in RC time constant, has much improved sensitivity characteristics, and is unaffected by changes in cable capacitance effects.
Coaxial arrangement of primary coil and two sensing secondary coils contained inside slender quartz tube inserted into ionized stream permits simultaneous determination of conductivity and linear velocity. System results agree favorably with theory.
Converging, coaxial accelerator electrode configuration operates in vacuum as plasma gun. Plasma forms by periodic injections of high pressure gas that is ionized by electrical discharges. Deflagration mode of discharge provides acceleration, and converging contours of plasma gun provide focusing.
Design criteria for high performance coaxial injector using gas-liquid space storable propellants
Control valve and coaxial variable injector for controlling bipropellant mixture ratio and flow
Design and development of device for cooling inner conductor of coaxial cable
Tranverse mode stability characteristics of coaxial and hyperthin injectors in tranverse excitation chamber
Transducer circuit design with single coaxial cable for input and output connections including incorporation into miniaturized catheter transducer