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There are a total of 33 record(s) matching your query.
Sorted by: Date Added To NTRS in Descending order
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Atomic Resonance Radiation Energetics Investigation as a Diagnostic Method for Non-Equilibrium Hypervelocity Flows
Author(s): Meyer, Scott A.; Bershader, Daniel; Sharma, Surendra P.; Deiwert, George S.
Abstract: Absorption measurements with a tunable vacuum ultraviolet light source have been proposed as a concentration diagnostic for atomic oxygen, and the viability of this technique is assessed in light of recent measurements. The ...
NASA Center: Ames Research Center
Publication Year: 1996
Added to NTRS: 2008-07-23
Accession Number: 96N25309; Document ID: 19960022288; Report Number: NAS 1.26:200803, NASA-CR-200803
Measured and calculated spectral radiation from a blunt body shock layer in an arc-jet wind tunnel
Author(s): Babikian, Dikran S.; Palumbo, Giuseppe; Craig, Roger A.; Park, Chul; Palmer, Grant; Sharma, Surendra P.
Abstract: Spectra of the shock layer radiation incident on the stagnation point of a blunt body placed in an arc-jet wind tunnel were measured over the wavelength range from 600 nm to 880 nm. The test gas was a mixture of 80 percent ...
NASA Center: Ames Research Center
Publication Year: 1994
Added to NTRS: 2008-06-02
Accession Number: 95N13720; Document ID: 19950007307; Report Number: AIAA PAPER 94-0086
The Importance of Optical Pathlength Control for Plasma Absorption Measurements
Author(s): Cruden, Brett A.; Rao, M. V. V. S.; Sharma, Surendra P.; Meyyappan, M.
Abstract: An inductively coupled GEC Cell with modified viewing ports has been used to measure in-situ absorption in CF4 plasmas via Fourier Transform Infrared Spectroscopy, and the results compared to those obtained in a standard ...
NASA Center: Ames Research Center
Publication Year: 2001
Added to NTRS: 2008-06-02
Document ID: 20020039148
Neutral Gas Temperature Estimates in an Inductively Coupled CF4 Plasma by Fitting Diatomic Emission Spectra
Author(s): Cruden, Brett A.; Rao, M. V. V. S.; Sharma, Surendra P.; Meyyappan, M.
Abstract: This work examines the accuracy of plasma neutral temperature estimates by fitting the rotational band envelope of different diatomic species in emission. Experiments are performed in an inductively coupled CF4 plasma ...
NASA Center: Ames Research Center
Publication Year: 2001
Added to NTRS: 2008-06-02
Document ID: 20020011360
Study of non-equilibrium transport phenomena
Author(s): Sharma, Surendra P.
Abstract: Nonequilibrium phenomena due to real gas effects are very important features of low density hypersonic flows. The shock shape and emitted nonequilibrium radiation are identified as the bulk flow behavior parameters which are ...
NASA Center: NASA (non Center Specific)
Publication Year: 1987
Added to NTRS: 2005-10-13
Accession Number: 87N20965; Document ID: 19870011532; Report Number: NAS 1.26:180441, NASA-CR-180441
Computations of Axisymmetric Flows in Hypersonic Shock Tubes
Author(s): Sharma, Surendra P.; Wilson, Gregory J.
Abstract: A time-accurate two-dimensional fluid code is used to compute test times in shock tubes operated at supersonic speeds. Unlike previous studies, this investigation resolves the finer temporal details of the shock-tube flow by ...
NASA Center: Ames Research Center
Publication Year: 1995
Added to NTRS: 2005-08-25
Document ID: 19980020899; Report Number: AIAA Paper 95-0713, NAS 1.15:207282, NASA/TM-96-207282
Experimental program for real gas flow code validation at NASA Ames Research Center
Author(s): Deiwert, George S.; Strawa, Anthony W.; Sharma, Surendra P.; Park, Chul
Abstract: The experimental program for validating real gas hypersonic flow codes at NASA Ames Rsearch Center is described. Ground-based test facilities used include ballistic ranges, shock tubes and shock tunnels, arc jet facilities ...
NASA Center: Ames Research Center
Publication Year: 1989
Added to NTRS: 2005-08-25
Accession Number: 89N26816; Document ID: 19890017445; Report Number: A-88135, NAS 1.15:100093, NASA-TM-100093
Experimental program for real gas flow code validation at NASA Ames Research Center
Author(s): Deiwert, George S.; Strawa, Anthony W.; Sharma, Surendra P.; Park, Chul
Abstract: The experimental program for validating real gas hypersonic flow codes at NASA Ames is described. Ground based test facilities used include ballistic ranges, shock tubes and shock tunnels, arcjet facilities and heated air ...
NASA Center: Ames Research Center
Publication Year: 1988
Added to NTRS: 2004-11-03
Accession Number: 89N18630; Document ID: 19890009259
Nonequilibrium and equilibrium shock front radiation measurements
Author(s): Sharma, Surendra P.; Gillespie, Walter
Abstract: The intensities of the radiation emitted behind a normal shock wave in N were measured in an electric-arc driven shock tube at a shock velocity of 6.2 km/sec. Both a time-resolved broad-band radiation intensity measurement ...
NASA Center: Ames Research Center
Publication Year: 1990
Added to NTRS: 2004-11-03
Accession Number: 90A22175; Document ID: 19900035120; Report Number: AIAA PAPER 90-0139
NASA Ames's electric arc-driven shock tube facility and research on nonequilibrium phenomena in low density hypersonic flows
Author(s): Sharma, Surendra P.
Abstract: Basic requirements for a ground test facility simulating low density hypersonic flows are discussed. Such facilities should be able to produce shock velocities in the range of 10-17 km/sec in an initial pressure of 0.010 to ...
NASA Center: Ames Research Center
Publication Year: 1992
Added to NTRS: 2004-11-03
Accession Number: 92A56801; Document ID: 19920074177; Report Number: AIAA PAPER 92-3975
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