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  • 1
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    The thermal efficiency and cost of producing hydrogen and other synthetic aircraft fuels from coal (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A comparison is made of the cost and thermal efficiency of producing liquid hydrogen, liquid methane and synthetic aviation kerosene from coal. These results are combined with estimates of the cost and energy losses associated with transporting, storing, and transferring the fuels to aircraft. The results of hydrogen-fueled and kerosene-fueled aircraft performance studies are utilized to compare the economic viability and efficiency of coal resource utilization of synthetic aviation fuels.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Format: text
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  • 2
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    The thermal efficiency and cost of producing hydrogen and other synthetic aircraft fuels from coal (1976)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A comparison is made of the cost and thermal efficiency of producing liquid hydrogen, liquid methane and synthetic aviation kerosene from coal. These results are combined with estimates of the cost and energy losses associated with transporting, storing, and transferring the fuels to aircraft. The results of hydrogen-fueled and kerosene-fueled aircraft performance studies are utilized to compare the economic viability and efficiency of coal resource utilization of synthetic aviation fuels.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Miami Univ. First World Hydrogen Energy Conf. Proc., Vol. 3; 28 p
    Format: text
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  • 3
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    Experimental and analytical analyses of the mechanisms governing the dispersion of flammable clouds formed by liquid hydrogen spills (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: This paper presents the initial findings of hydrogen vapor cloud dispersion experiments conducted by NASA. The experiments were performed to obtain basic information regarding the physical phenomena governing the dispersion of flammable clouds formed as the result of spills of large quantities of liquid hydrogen. The experiments consisted of ground spills of up to 5.7 cu m of liquid hydrogen with spill durations of approx. 35 s. Instrumented towers, located downwind of the spill site, gathered data on the temperature, hydrogen concentration and turbulence levels as the hydrogen vapor cloud drifted downwind. Preliminary results of the experiments indicate that, for rapid spills, thermal and momentum-induced turbulences cause the cloud to disperse to safe concentration levels and become positively buoyant long before mixing due to normal atmospheric turbulence becomes a major factor. An adiabatic mixing model has been developed to deduce hydrogen-air mixture ratios for temperature measurements obtained within the cloud formed by liquid hydrogen spills.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: International Journal of Hydrogen Energy (ISSN 0360-3199); 9; 5, 19
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  • 4
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    Progress on coal-derived fuels for aviation systems (1978)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The results of engineering studies of coal-derived aviation fuels and their potential application to the air transportation system are presented. Synthetic aviation kerosene (SYN. JET-A), liquid methane (LCH4) and liquid hydrogen (LH2) appear to be the most promising coal-derived fuels. Aircraft configurations fueled with LH2, their fuel systems, and their ground requirements at the airport are identified. Energy efficiency, transportation hazards, and costs are among the factors considered. It is indicated that LCH4 is the most energy efficient to produce, and provides the most efficient utilization of coal resources and the least expensive ticket as well.
    Keywords: PROPELLANTS AND FUELS
    Type: CTOL Transport Technol., 1978; p 927-950
    Format: application/pdf
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  • 5
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    Comparative aerodynamic study of two hypersonic cruise aircraft configurations derived from trade-off studies (1967)
    In:  Other Sources
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    Publication Date: 2016-06-07
    Keywords: GENERAL
    Type: Conf. on Hypersonic Aircraft Technol.; p 45-62
    Format: text
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  • 6
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    Hydrogen-fueled subsonic aircraft: A perspective (1976)
    In:  Other Sources
    Details
    Publication Date: 2016-06-07
    Description: The performance characteristics of hydrogen-fueled subsonic transport aircraft are compared to those using conventional aviation kerosene. Additional aspects discussed include potential improvements in the exhaust emissions characteristics of aircraft jet engines, problems associated with onboard fuel containment, results of recent studies of the impact of hydrogen-fueled aircraft on the airport and associated ground support equipment, and estimates of the cost and thermal efficiency of producing synthetic aviation fuels from coal.
    Keywords: PROPELLANTS AND FUELS
    Type: Advan. in Eng. Sci., Vol. 3; p 1265-1278
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  • 7
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    Space-station crew-safety requirements (1983)
    In:  Other Sources
    Details
    Publication Date: 2018-12-01
    Description: Baseline rescue and survival concepts for future space station crews are described. Preliminary studies are being carried out to identify potential threats to crew safety and means to counteract the dangers. Significant factors being considered include the type of threat, the warning time, the number of crewmembers, strategies for protection of the crew (including life-support measures redundancy), and the dependence of space station crews on ground personnel. Attention is being given to the impact of safety devices on the space station geometry and cost, as well as the equipment necessary to maintain the crew in a psychological status positive enough to cope with emergencies. Typical threats would be fire, crewmember illness or injury, and abandonment of the station. A Shuttle launch could take up to 12 days, while equipping the space station with an emergency return capsule would permit return on the same day as the capsule was occupied.
    Keywords: SPACE TRANSPORTATION
    Format: text
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  • 8
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    An advanced hypervelocity aerophysics facility - A ground-based flight-test range (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The paper discusses a concept for a ground-based flight-test facility, a large aeroballistic range capable of launching models large enough to permit the installation of significant amounts of onboard instrumentation. The large model size would also provide thick shock/boundary layers, thus providing the opportunity to measure flow-field properties via advanced offboard diagnostics. Current fabrication technology should permit the construction of a two-stage light-gas gun capable of accelerating 20 to 25 cm diameter models to velocities on the order of 6 km/sec. An electromagnetic launcher or a ram accelerator is considered as a potential means for achieving larger model sizes and/or greater launch velocities. Possible methods for obtaining and recording data are discussed as are the test chamber and model deceleration section requirements.
    Keywords: RESEARCH AND SUPPORT FACILITIES (AIR)
    Type: AIAA PAPER 91-0296
    Format: text
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  • 9
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    Telescoping space station modules (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A design concept is described wherein telescoping space station modules would be utilized to nearly double the useful volume onboard a station. Methods for utilizing the concept to obtain enchanced protection from space debris and radiation are described. The amenability of the concept to variation in station configuration, assembly, and disassembly is discussed. A modification of the concept which could provide flexibility in the manner in which the Shuttle Orbiter is docked with the station and enhance collision avoidance during such maneuvers is described.
    Keywords: LAUNCH VEHICLES AND SPACE VEHICLES
    Type: NASA-TM-86253 , NAS 1.15:86253
    Format: application/pdf
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  • 10
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    Wing sweep and blunting effects on delta planforms at m equals 20 (1964)
    In:  CASI
    Details
    Publication Date: 2019-05-23
    Description: Wing sweep and blunting effects on delta planforms in helium flow at Mach 20
    Keywords: AERODYNAMICS
    Type: NASA-TM-X-54706
    Format: application/pdf
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