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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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At least 181 records · Page 10
All sourcesNASA NTRSDOE OSTI
NASA NTRS1965

Optimal communication nets

Optimal communication nets - results in case of equal weights, arbitrary weights, and probabilistic weights

WEIGHT↗
NASA NTRS1967

Net-2 circuit analysis program

Circuit features, variational capabilities, input-output capabilities, and transient analysis of NET-2 circuit program

COMPUTER DESIGN↗
NASA NTRS1970

Twin-spool turbopumps for ''low'' net positive suction pressure operations

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.

Bair, E. K.↗
NASA NTRS1971

A preliminary control net of Mars

Mars surface areodetic control net from Mariner 6 and 7 TV pictures, determining initial coordinate points and far and near encounter frames

Berg, R. A.↗
NASA NTRS1972

Experimental findings from zero-tank net positive suction head operation of the J-2 hydrogen pump

The results of a series of liquid hydrogen turbopump tests to demonstrate the feasibility of zero-tank net positive suction head are presented. A J-2 engine hydrogen pump and S-IVB stage fuel feed system were used for this investigation. The pump was operated at flows and speeds equivalent to normal J-2 engine operating conditions and at hydrogen bulk temperatures between 39 and 45 R. These tests show zero-tank not positive suction head to be a realistic operating mode that should be considered for future applications.

Stinson, H. P.↗
NASA NTRS1973

Net vapor generation point in boiling flow of trichlorotrifluoroethane at high pressures

The conditions at which the void in subcooled boiling starts to undergo a rapid increase were studied experimentally. The experiments were performed in a 12.7 x 9.5 mm rectangular channel. Heating was from a 3.2 mm wide strip embedded in one wall. The pressure ranged from 9.45 to 20.7 bar, mass velocity from 600 to 7000 kg/sq m sec, and subcooling from 16 to 67 C. Photographs were used to determine when detached bubbles first appeared in the bulk flow. Measurements of bubble layer thickness along the wall were also made. Results showed that the point of net vapor generation is close to the occurrence of fully-developed boiling.

Dougall, R. S.↗
NASA NTRS1973

Mariner 9 control net of Mars, April 1973

A planet-wide geodetic control net of Mars that is based on the Mariner 9 television pictures has been in the process of being computed since January 1972. Results of the computations as of April 1973 are presented. Areocentric and areographic coordinates of 1340 control points have been computed using 613 frames and are presented tabularly. These coordinates will be revised as additional points and frames are added to the computation in the future.

Davis, M. E.↗