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  • 1
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    Research on aviation fuel instability (1984)
    In:  CASI
    Details
    Publication Date: 2006-04-09
    Description: The problems associated with aircraft fuel instability are discussed. What is currently known about the problem is reviewed and a research program to identify those areas where more research is needed is discussed. The term fuel instability generally refers to the gums, sediments, or deposits which can form as a result of a set of complex chemical reactions when a fuel is stored for a long period at ambient conditions or when the fuel is thermally stressed inside the fuel system of an aircraft.
    Keywords: PROPELLANTS AND FUELS
    Type: Assessment of Alternative Aircraft Fuels; p 121-130
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Research on aviation fuel instability (1984)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: Current aircraft turbine fuels do not present a significant problem with fuel thermal stability. However, turbine fuels with broadened properties or nonpetroleum derived fuels may have reduced thermal stability because of their higher content of olefins, heteroatoms, and trace metals. Moreover, advanced turbine engines will increase the thermal stress on fuels because of their higher pressure ratios and combustion temperature. In recognition of the importance of this problem, NASA Lewis is currently engaged in a broadly based research effort to better understand the underlying causes of fuel thermal degradation. The progress and status of our various activities in this area are discussed. Topics covered include: nature of fuel instability and its temperature dependence, methods of measuring the instability, chemical mechanisms involved in deposit formation, and instrumental methods for characterizing fuel deposits. Finally, some preliminary thoughts on design approaches for minimizing the effects of lowered thermal stability are briefly discussed.
    Keywords: PROPELLANTS AND FUELS
    Type: AGARD Combust. Probl. in Turbine Eng. 11p (SEE N84-24732 15-25)
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Study of Systems and Technology for Liquid Hydrogen Production Independent of Fossil Fuels (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Based on Kennedy Space Center siting and logistics requirements and the nonfossil energy resources at the Center, a number of applicable technologies and system candidates for hydrogen production were identified and characterized. A two stage screening of these technologies in the light of specific criteria identified two leading candidates as nonfossil system approaches. Conceptual design and costing of two solar-operated, stand alone systems, one photovoltaic based on and the other involving the power tower approach reveals their technical feasibility as sited as KSC, and the potential for product cost competitiveness with conventional supply approaches in the 1990 to 1210 time period. Conventional water hydrolysis and hydrogen liquefaction subsystems are integrated with the solar subsystems.
    Keywords: PROPELLANTS AND FUELS
    Type: NASA-CR-173422 , NAS 1.26:173422
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Efficiency and economics of large scale hydrogen liquefaction (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Liquid hydrogen is being considered as a substitute for conventional hydrocarbon-based fuels for future generations of commercial jet aircraft. Its acceptance will depend, in part, upon the technology and cost of liquefaction. The process and economic requirements for providing a sufficient quantity of liquid hydrogen to service a major airport are described. The design is supported by thermodynamic studies which determine the effect of process arrangement and operating parameters on the process efficiency and work of liquefaction.
    Keywords: PROPELLANTS AND FUELS
    Type: SAE PAPER 751094 , National Aerospace Engineering and Manufacturing Meeting; Nov 17, 1975 - Nov 20, 1975; Culver City, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Economics of hydrogen production and liquefaction updated to 1980 (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Revised costs for generating and liquefying hydrogen in mid-1980 are presented. Plant investments were treated as straight-forward escalations resulting from inflation. Operating costs, however, were derived in terms of the unit cost of coal, fuel gas and electrical energy to permit the determination of the influence of these parameters on the cost of liquid hydrogen. Inflationary influence was recognized by requiring a 15% discounted rate of return on investment for Discounted Cash Flow financing analysis, up from 12% previously. Utility financing was revised to require an 11% interest rate on debt. The scope of operation of the hydrogen plant was revised from previous studies to include only the hydrogen generation and liquefaction facilities. On-site fuel gas and power generation, originally a part of the plant complex, was eliminated. Fuel gas and power are now treated as purchased utilities. Costs for on-site generation of fuel gas however, are included.
    Keywords: PROPELLANTS AND FUELS
    Type: NASA-CR-159163
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Study of Hydrogen Recovery Systems for Gas Vented While Refueling Liquid-Hydrogen Fueled Aircraft (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Methods of capturing and reliquefying the cold hydrogen vapor produced during the fueling of aircraft designed to utilize liquid hydrogen fuel were investigated. An assessment of the most practical, economic, and energy efficient of the hydrogen recovery methods is provided.
    Keywords: PROPELLANTS AND FUELS
    Type: NASA-CR-158991
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Research on aviation fuel instability (1983)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The underlying causes of fuel thermal degradation are discussed. Topics covered include: nature of fuel instability and its temperature dependence, methods of measuring the instability, chemical mechanisms involved in deposit formation, and instrumental methods for characterizing fuel deposits. Finally, some preliminary thoughts on design approaches for minimizing the effects of lowered thermal stability are briefly discussed.
    Keywords: PROPELLANTS AND FUELS
    Type: NASA-TM-83420 , E-1710 , NAS 1.15:83420 , AGARD Propulsion and Energetics Panel Symp. on Combust. Probl. in Turbine Eng.; Oct 03, 1983 - Oct 07, 1983; Cesme; Turkey
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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