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  • 1
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    NASA Lewis Research Center combustion MHD experiment (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: The MHD power generation experiments were conducted in a high field strength cryomagnet which was adapted from an existing facility. In its original construction, it consisted of 12 high purity aluminum coils pool cooled in a bath of liquid neon. In this configuration, a peak field of 15 tesla was produced. For the present experiments, the center four coils were removed and a 23 cm diameter transverse warm bore tube was inserted to allow the placement of the MHD experiment between the remaining eight coils. In this configuration, a peak field of 6 tesla should be obtainable. The time duration of the experiment is limited by the neon supply which allows on the order of 1 minute of total operating time followed by an 18-hour reliquefaction period. As a result, the experiments are run in a pulsed mode. The run duration for the data presented here was 5 sec. The magnetic field profile along the MHD duct is shown. Since the working fluid is in essence superheated steam, it is easily water quenched at the exit of the diffuser and the components are designed vacuum tight so that the exhaust pipe and demister an be pumped down to simulate the vacuum of outer space.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: R and D Associates Proc. of the AFOSR Spec. Conf. on Prime-Power for High Energy Space Systems, Vol. 1; 10 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Quantitative analysis of defects in silicon. Silicon sheet growth development for the large are silicon sheet task of the low-cost solar array project (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: One hundred and seventy four silicon sheet samples were analyzed for twin boundary density, dislocation pit density, and grain boundary length. Procedures were developed for the quantitative analysis of the twin boundary and dislocation pit densities using a QTM-720 Quantitative Image Analyzing system. The QTM-720 system was upgraded with the addition of a PDP 11/03 mini-computer with dual floppy disc drive, a digital equipment writer high speed printer, and a field-image feature interface module. Three versions of a computer program that controls the data acquisition and analysis on the QTM-720 were written. Procedures for the chemical polishing and etching were also developed.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-163140 , MRI-276 , DOE/JPL-954977-79/9
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    NASA TECHNICAL REPORTS
  • 3
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    Analysis of defect structure in silicon. Silicon sheet growth development for the large area silicon sheet task of the Low-Cost Solar array Project (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: One hundred ninety-three silicon sheet samples, approximately 880 square centimeters, were analyzed for twin boundary density, dislocation pit density, and grain boundary length. One hundred fifteen of these samples were manufactured by a heat exchanger method, thirty-eight by edge defined film fed growth, twenty-three by the silicon on ceramics process, and ten by the dendritic web process. Seven solar cells were also step-etched to determine the internal defect distribution on these samples. Procedures were developed or the quantitative characterization of structural defects such as dislocation pits, precipitates, twin & grain boundaries using a QTM 720 quantitative image analyzing system interfaced with a PDP 11/03 mini computer. Characterization of the grain boundary length per unit area for polycrystalline samples was done by using the intercept method on an Olympus HBM Microscope.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-169058 , DOE/JPL-955676-1 , JPL-9950-677 , NAS 1.26:169058 , MRI-289
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  • 4
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    Velocity and temperature distributions of coal-slag layers on magnetohydrodynamic generators walls (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Approximate analytical expressions are derived for the velocity and temperature distributions in steady state coal slag deposits flowing over MHD generator walls. Effects of slag condensation and Joule heating are included in the analysis. The transport conditions and the slag temperature at the slag-gas interface are taken to be known parameters in the formulation. They are assumed to have been predetermined either experimentally or from the slag properties and the gas dynamic calculations of the free stream flow. The analysis assumes a power law velocity profile for the slag and accounts for the coupling between the energy and momentum conservation equations. Comparisons are made with the more exact numerical solutions to verify the accuracy of the results.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TN-D-8396 , E-8929
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  • 5
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    Quantitative Analysis of Defects in Silicon. Silicon Sheet Growth Development for the Large Area Silicon Sheet Task of the Low-cost Solar Array Project (1979)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The various steps involved in the chemical polishing and etching of silicon samples are described. Data on twins, dislocation pits, and grain boundaries from thirty-one (31) silicon sample are also discussed. A brief review of the changes made to upgrade the image analysis system is included.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-158738 , QPR-4 , MRI-269 , DOE/JPL-954977-78/1
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  • 6
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    Quantitative Analysis of Defects in Silicon (1979)
    In:  CASI
    Details
    Publication Date: 2019-07-20
    Description: The evaluation and prediction of the conversion efficiency for a variety of silicon samples with differences in structural defects, such as grain boundaries, twin boundaries, precipitate particles, dislocations, etc. are discussed. Quantitative characterization of these structural defects, which were revealed by etching the surface of silicon samples, is performed by using an image analyzer. Due to different crystal growth and fabrication techniques the various types of silicon contain a variety of trace impurity elements and structural defects. The two most important criteria in evaluating the various silicon types for solar cell applications are cost and conversion efficiency.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-162173 , MRI-273 , QPR-5 , DOE/JPL-954977-79/6
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  • 7
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    A summary of the ECAS performance and cost results for MHD systems (1976)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The potential is examined of various advanced power plant concepts using coal and coal-derived fuel. The results indicate that open cycle coal fired direct preheat MHD systems have potentially one of the highest coal-pile-to-bus-bar efficiencies and also one of the lowest costs of electricity (COE) of the systems studied. Closed cycle MHD systems may have the potential to approach the efficiency and COE of open cycle MHD. The 1200-1500 F liquid metal MHD systems studied do not appear to have the potential of exceeding the efficiency or competing with the COE of advanced steam plants.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-X-71913 , Symp. on the Eng. Aspects of Magnetohydrodynamics; May 24, 1976 - May 26, 1976; Philadelphia, PA; United States
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  • 8
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    Results and progress on the NASA Lewis H2-O2 MHD program (1976)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: It was found that flame sprayed ceramic coatings on combustion chamber and nozzle walls permit operation with hot walls, thereby eliminating possible problems associated with seed condensation. However, under the conditions of experiment the net heat transfer was unexpectedly increased over that of cold copper walls. Pressure disturbances associated with oblique pressure waves were measured in a MHD channel. These disturbances are due to a rocket-type nozzle which was designed to achieve low weight rather than perfectly parallel flow at the exit. A new nozzle with parallel flow at the exit was designed. Electrical conductivity measurements agreed well with theory except at low combustion pressures and/or high ratios of seed/oxygen mass flows (seed was injected into oxygen flow line). The discrepancy is believed to be the result of poor atomization of the seed at high ratios of seed/oxygen mass flows which results in droplet sizes which do not completely vaporize the combustor.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-X-71891 , E-8675 , Symp. on the Eng. Aspects of Magnetohydrodyn.; May 24, 1976 - May 26, 1976; Philadelphia, PA; United States
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  • 9
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    Quantitative analysis of defects in silicon: Silicon sheet growth development for the large area silicon sheet task of the low cost solar array project (1978)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The various steps involved in the chemical polishing and etching of silicon samples are described and the data on twins, grain boundaries and dislocation pits from fifty-three (53) samples are discussed.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-158709 , MRI-264 , DOE/JPL-954977-78/1 , QPR-3
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    NASA TECHNICAL REPORTS
  • 10
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    Performance optimization of an MHD generator with physical constraints (1979)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A method to optimize the Faraday MHD generator performance under a prescribed set of electrical and magnet constraints is described. The results of generator performance calculations using this technique are presented for a very large MHD/steam plant. The differences between the maximum power and maximum net power generators are described. The sensitivity of the generator performance to the various operational parameters are presented.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-79172 , DOE/NASA/2674-79/5 , E-036 , Intersoc. Energy Conversion Eng. Conf.; Aug 05, 1979 - Aug 10, 1979; Boston, MA; United States
    Format: application/pdf
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