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  • 1
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    fuel elements and fuel-element materials (1966)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Keywords: GENERAL
    Type: Nucl. Rocket Technol. Conf.; p 217-261
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Overview of the 1986 free-piston Stirling SP-100 activities at the NASA Lewis Research Center (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: An overview of the NASA Lewis Research Center SP-100 free-piston Stirling engine activities is presented. These activities include a free-piston Stirling space-power technology feasibility demonstration project as part of the SP-100 program being conducted in support of the Department of Defennse (DOD), Department of Energy (DOE), and NASA. The space-power Stirling advanced technology effort, under SP-100, addresses the status of the 25 kWe Space Power Demonstrator Engine (SPDE) including test results. Future space-power projections are presented along with a description of a study that will investigate the feasibility of scaling a single-cylinder free-piston Stirling space-power module to the 150 kW power range. Design parameters and conceptual design features will be presented for a 25 kWe, single-cylinder free-piston Stirling space-power converter. A description of a hydrodynamic gas bearing concept is presented whereby the displacer of a 1 kWe free-piston Stirling engine is modified to demonstrate the bearing concept. And finally the goals of a conceptual design for a 25 kWe Solar Advanced Stirling Conversion System capable of delivering electric power to an electric utility grid are discussed.
    Keywords: MECHANICAL ENGINEERING
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    NASA TECHNICAL REPORTS
  • 3
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    Overview of the 1985 NASA Lewis Research Center SP-100 free-piston Stirling engine activities (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: This effort is keyed on the design, fabrication, assembly, and testing of a 25 kWe Stirling space-power technology-feasibility demonstrator engine. Another facet of the SP-100 project covers the status of a 9000-hr endurance test conducted on a 2 kWe free-piston Stirling/linear alternator system employing hydrostatic gas bearings. Dynamic balancing of the RE-1000 engine (a 1 kWe free-piston Stirling engine) using a passive dynamic absorber will be discussed along with the results of a parametric study showing the relationships of Stirling power converter specific weight and efficiency as functions of Stirling engine heater to cooler temperature ratio. Planned tests will be described covering a hydrodynamic gas bearing concept for potential SP-100 application.
    Keywords: MECHANICAL ENGINEERING
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    NASA TECHNICAL REPORTS
  • 4
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    Heat-transfer and pressure drop correlations for hydrogen and nitrogen flowing through tungsten wire mesh at temperatures to 5200 deg r (1965)
    In:  CASI
    Details
    Publication Date: 2019-05-23
    Description: Heat transfer and friction pressure drop for forced convection of hydrogen and nitrogen through electrically heated tungsten wire mesh
    Keywords: THERMODYNAMICS AND COMBUSTION
    Type: NASA-TN-D-2924
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Assessment of a 40-kilowatt stirling engine for underground mining applications (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An assessment of alternative power souces for underground mining applications was performed. A 40-kW Stirling research engine was tested to evaluate its performance and emission characteristics when operated with helium working gas and diesel fuel. The engine, the test facility, and the test procedures are described. Performance and emission data for the engine operating with helium working gas and diesel fuel are reported and compared with data obtained with hydrogen working gas and unleaded gasoline fuel. Helium diesel test results are compared with the characteristics of current diesel engines and other Stirling engines. External surface temperature data are also presented. Emission and temperature results are compared with the Federal requirements for diesel underground mine engines. The durability potential of Stirling engines is discussed on the basis of the experience gaind during the engine tests.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-82822 , E-1171 , NAS 1.15:82822
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    A 4500 deg R /2500 deg K/ flowing-gas facility (1968)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: High temperature flowing gas heater consisting of four stages for heating gases
    Keywords: FACILITIES, RESEARCH, AND SUPPORT
    Type: NASA-TM-X-1506
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Heat-transfer coefficients for hydrogen flowing through parallel hexagonal passages at surface temperatures to 2275 K (1968)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Forced convection heat-transfer data for hydrogen flow through heated parallel hexagonal passages
    Keywords: THERMODYNAMICS AND COMBUSTION
    Type: NASA-TN-D-4959
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Overview of a stirling engine test project (1980)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Tests were conducted on three Stirling engines ranging in size from 1.33 to 53 horsepower (1 to 40 kW). The tests were directed toward developing alternative, backup component concepts to improve engine efficiency and performance or to reduce costs. Some of the activities included investigating attractive concepts and materials for cooler-regenerator units, installing a jet impingement device on a Stirling engine to determine its potential for improved engine performance, and presenting performance maps for initial characterization of Stirling engines. The experiment results of the tests are presented along with predictions of results of future tests to be conducted on the Stirling engines.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-81442 , DOE/NASA/1040-80/12 , E-362 , Intern. Automotive Propulsion Systems Symp.; Apr 14, 1980 - Apr 18, 1980; Dearborn, MI; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    The NASA high-power carbon dioxide laser - A versatile tool for laser applications (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The NASA Lewis Research Center has designed and fabricated a closed-cycle, continuous wave (CW), carbon dioxide (CO2) high-power laser to support research for the identification and evaluation of possible high-power laser applications. The device is designed to generate up to 70 kW of laser power in annular-shape beams from 1 to 9 cm in diameter. Electric discharge, either self-sustained or electron-beam-sustained, is used for excitation. This laser facility can be used in two ways. First, it provides a versatile tool on which research can be performed to advance the state-of-the-art technology of high-power CO2 lasers in such areas as electric excitation, laser chemistry, and quality of output beams, all of which are important whether the laser application is government or industry oriented. Second, the facility provides a well-defined, continuous wave beam for various application experiments, such as propulsion, power conversion, and materials processing.
    Keywords: LASERS AND MASERS
    Type: Seminar on Industrial applications of high power laser technology; Aug 24, 1976 - Aug 25, 1976; San Diego, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Free-piston Stirling hydraulic engine and drive system for automobiles (1982)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The calculated fuel economy for an automotive free piston Stirling hydraulic engine and drive system using a pneumatic accumulator with the fuel economy of both a conventional 1980 spark ignition engine in an X body class vehicle and the estimated fuel economy of a 1984 spark ignition vehicle system are compared. The results show that the free piston Stirling hydraulic system with a two speed transmission has a combined fuel economy nearly twice that of the 1980 spark ignition engine - 21.5 versus 10.9 km/liter (50.7 versus 25.6 mpg) under comparable conditions. The fuel economy improvement over the 1984 spark ignition engine was 81 percent. The fuel economy sensitivity of the Stirling hydraulic system to system weight, number of transmission shifts, accumulator pressure ratio and maximum pressure, auxiliary power requirements, braking energy recovery, and varying vehicle performance requirements are considered. An important finding is that a multispeed transmission is not required. The penalty for a single speed versus a two speed transmission is about a 12 percent drop in combined fuel economy to 19.0 km/liter (44.7 mpg). This is still a 60 percent improvement in combined fuel economy over the projected 1984 spark ignition vehicle.
    Keywords: URBAN TECHNOLOGY AND TRANSPORTATION
    Type: NASA-TM-82992 , E-1421 , NAS 1.15:82992 , Automotive Technol. Develop. Contractor Coordination Meeting; Oct 25, 1982 - Oct 28, 1982; Dearborn, MI; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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