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  • 1980-1984  (5)
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  • 1
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    Unknown
    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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    Unknown
    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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    Unknown
    A study of external fuel vaporization (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Candidate external vaporizer designs for an aircraft gas turbine engine are evaluated with respect to fuel thermal stability, integration of the vaporizer system into the aircraft engine, engine and vaporizer dynamic response, startup and altitude restart, engine performance, control requirements, safety, and maintenance. The selected concept is shown to offer potential gains in engine performance in terms of reduced specific fuel consumption and improved engine thrust/weight ratio. The thrust/weight improvement can be traded against vaporization system weight.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: ASME PAPER 81-GT-158 , Gas Turbine Conference and Products Show; Mar 09, 1981 - Mar 12, 1981; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    High-pressure flame visualization of autoignition and flashback phenomena with liquid-fuel spray (1983)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A study was undertaken to determine the effect of boundary layers on autoignition and flashback for premixed Jet-A fuel in a unique high-pressure windowed test facility. A plate was placed in the center of the fuel-air stream to establish a boundary layer. Four experimental configurations were tested: a 24.5-cm-long plate with either a pointed leading edge, a rounded edge or an edge with a 0.317-cm step, or the duct without the plate. Experiments at an equivalence ratio ranging from 0.4 to 0.9 were performed at pressures to 2500 kPa (25 atm.) at temperatures of 600, 645, and 700 K and velocities to 115 meters per second. Flame shapes were observed during flashback and autoignition using high speed cinematography. Flashback and autoignition limits were determined.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-TM-83501 , E-1840 , NAS 1.15:83501 , Western States Sec. Fall Meeting; Oct 17, 1983 - Oct 18, 1983
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Unknown
    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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