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  • 1
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    Analytical modeling of operating characteristics of premixing-prevaporizing fuel-air mixing passages. Volume 2: User's manual (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A user's manual describing the operation of three computer codes (ADD code, PTRAK code, and VAPDIF code) is presented. The general features of the computer codes, the input/output formats, run streams, and sample input cases are described.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-167990-VOL-2 , NAS 1.26:167990-V0L-2 , R82-915362-40-VOL-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Analytical modeling of operating characteristics of premixing-prevaporizing fuel-air mixing passages. Volume 1: Analysis and results (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A model for predicting the distribution of liquid fuel droplets and fuel vapor in premixing-prevaporizing fuel-air mixing passages of the direct injection type is reported. This model consists of three computer programs; a calculation of the two dimensional or axisymmetric air flow field neglecting the effects of fuel; a calculation of the three dimensional fuel droplet trajectories and evaporation rates in a known, moving air flow; a calculation of fuel vapor diffusing into a moving three dimensional air flow with source terms dependent on the droplet evaporation rates. The fuel droplets are treated as individual particle classes each satisfying Newton's law, a heat transfer, and a mass transfer equation. This fuel droplet model treats multicomponent fuels and incorporates the physics required for the treatment of elastic droplet collisions, droplet shattering, droplet coalescence and droplet wall interactions. The vapor diffusion calculation treats three dimensional, gas phase, turbulent diffusion processes. The analysis includes a model for the autoignition of the fuel air mixture based upon the rate of formation of an important intermediate chemical species during the preignition period.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-167990-VOL-1 , NAS 1.26:167990-VOL-1 , R82-915362-40-VOL-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Combustion of coal gas fuels in a staged combustor (1982)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Gaseous fuels produced from coal resources generally have heating values much lower than natural gas; the low heating value could result in unstable or inefficient combustion. Coal gas fuels may contain ammonia which if oxidized in an uncontrolled manner could result in unacceptable nitrogen oxide exhaust emission levels. Previous investigations indicate that staged, rich-lean combustion represents a desirable approach to achieve stable, efficient, low nitrogen oxide emission operation for coal-derived liquid fuels contaning up to 0.8-wt pct nitrogen. An experimental program was conducted to determine whether this fuel tolerance can be extended to include coal-derived gaseous fuels. The results of tests with three nitrogen-free fuels having heating values of 100, 250, and 350 Btu/scf and a 250 Btu/scf heating value doped to contain 0.7 pct ammonia are presented.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-82987 , DOE/NASA/13111-12 , E-1419 , NAS 1.15:82987 , Joint Power Conf.; Oct 17, 1982 - Oct 21, 1982; Denver
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Collector temperature effects on the performance of advanced thermionic converters and nuclear electric propulsion systems (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The specific weight of a thermionic nuclear electric propulsion (NEP) system depends on the collector temperature because of changes in power density, efficiency and the temperature of heat rejection. Increasing the collector temperature above the value for maximum converter performance decreases both the efficiency and the power density of the converters, but the specific weight of the total system is decreased because of the reduction in radiator weight due to the increased heat rejection temperature. The effect of collector temperature on the performance of thermionic converters was investigated. The behavior of conventional ignited mode converters as well as advanced converters with lower collector work functions; the specific mass of an 'uninsulated' NEP system design was then evaluated as a function of collector temperature. The uninsulated design uses the electrical resistance of the heat pipes between the converters and the reactor to provide electrical insolation, eliminating the need for ceramic insulators at emitter temperature and providing other design advantages. The results indicate that an optimum collector temperature, which minimizes system weight, exists at a temperature above the optimum temperature for converter performance.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Energy to the 21st century; Aug 18, 1980 - Aug 22, 1980; Seattle, WA
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    A model for the analysis of premixing-prevaporizing fuel-air mixing passages (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A model for predicting the distribution of liquid fuel droplets and fuel vapor in premixing-prevaporizing fuel-air mixing passages has been developed. The analysis involves successive application of computer codes which calculate the two dimensional or axisymmetric air flow field; calculate the three dimensional fuel droplet trajectories and evaporation rates; and calculate the fuel vapor diffusing through a moving air stream. A description of the more important features of the model and the results of a design study on two premixing fuel-air passages are presented.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: AIAA PAPER 81-0345 , Aerospace Sciences Meeting; Jan 12, 1981 - Jan 15, 1981; St. Louis, MO
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Olfactory-Based Orientation in Artificially Imprinted Sea Turtles (1984)
    American Association for the Advancement of Science
    Details
    Publication Date: 1984-04-06
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science
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    PAPER CURRENT
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