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  • Other Sources  (10)
  • MECHANICS  (6)
  • PROPELLANTS AND FUELS  (4)
  • 1980-1984  (6)
  • 1965-1969  (4)
  • 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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    Bidirectional torque filter eliminates backlash (1965)
    In:  CASI
    Details
    Publication Date: 2019-05-23
    Description: Two elastic springs connecting a hub and two spur gears absorb bidirectional step torque differentials and provide antibacklash characteristics between input and output shafts. This device is used in precise control systems.
    Keywords: MECHANICS
    Type: GSC-335
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Combustion chamber inlet manifold separates vapor from liquid (1966)
    In:  CASI
    Details
    Publication Date: 2019-05-29
    Description: Circular manifold with tangential orifices at the inner circumference provides for the vapor constituent of a vaporized cryogenic propellant to enter a rocket combustion chamber before the liquid constituent. The vapor is separated from the liquid by centrifugal action and precedes it into the chamber through carefully positioned orifices.
    Keywords: MECHANICS
    Type: MFS-531
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Stationary device produces homogeneous mixture of fluids (1966)
    In:  CASI
    Details
    Publication Date: 2019-05-29
    Description: Stationary device produces a homogeneous mixture of two or more one-phase or two-phase fluids. The device contains two concentric flow guides with helical passageways through which the fluids are forced into turbulent flow by the system pressure differential.
    Keywords: MECHANICS
    Type: MFS-525
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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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
  • 7
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    Ultrasonics permits brazing complex stainless steel assembly without flux (1967)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Ultrasonic vibration of an assembly of stainless steel instrumentation tubes ensures brazing without flux. Vibration with an ultrasonic transducer permits the brazing material to flow down each tube in contact with a seal plug installed in a pressure vessel wall.
    Keywords: MECHANICS
    Type: NU-0115
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    A generalized vortex lattice method (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Several variations of vortex lattice method that are currently available have proved practical and versatile theoretical tools for aerodynamic analysis and design of planar and nonplanar configurations. Success of method is due in great part to relative simplicity of numerical technique involved and to accuracy of results obtained; however, most of available procedures are for subsonic flow applications. VORLAX program was developed to incorporate direct extension of vortex lattice method into supersonic flow regime, thus providing analyst with full flow range capability.
    Keywords: MECHANICS
    Type: LAR-12636 , NASA Tech Briefs (ISSN 0145-319X); 5; 2; P. 209
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Shear-Panel Test Fixture Eliminates Corner Stresses (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: New design eliminates corner stresses while maintaining uniform stress across panel. Shear panel test fixture includes eight frames and eight corner pins. Fixture assembled in two halves with shear panel sandwiched in between. Results generated from this fixture will result in good data base for design of efficient aircraft structures and other applications.
    Keywords: MECHANICS
    Type: LAR-12930 , NASA Tech Briefs (ISSN 0145-319X); 8; 1; P. 82
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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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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