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  • 1
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    Global Atmospheric Sampling Program (GASP) (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA, Washington Upper Atmosphere Res. Program; p 65-66
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Sulfate and nitrate mixing ratios in the vicinity of the tropopause (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Measurements of sulfate and nitrate in filter samples made during the Global Atmospheric Sampling Program (GASP) from aircraft flying near the tropopause over a period of 28 months beginning in early 1976 are presented. Sulfate and nitrate mixing ratios show a peak near or just above the tropopause during the winter-spring seasons. No peak is evident for sulfate during the summer-fall seasons. The sulfate mixing ratios show a constant average level in 1977-78 of 0.12 + or 0.04 ppbm above the tropopause and 0.05 + or - 0.04 ppbm below the tropopause with higher levels in the spring. Nitrate levels are similar but exhibit greater variability. Correlations between sulfate and nitrate (r = 0.78) and between sulfate and nitrate, on ozone (r = 0.80, 0.78) suggest a predominately stratospheric source for these species.
    Keywords: ENVIRONMENT POLLUTION
    Type: Atmospheric Environment; 13; 9, 19; 1979
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Flame radiation and linear heat transfer in a tubular-can combustor (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Journal of Propulsion and Power (ISSN 0748-4658); 1; 270-278
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    NASA TECHNICAL REPORTS
  • 4
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    Detailed fuel spray analysis techniques (1984)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: Fuel spray analyses which are a necessary input to the analytical modeling of the complex mixing and combustion processes which occur in advanced combustor systems are discussed. It is anticipated that by controlling fuel air reaction conditions, combustor temperatures can be better controlled, leading to improved combustion system durability. The capability to measure liquid droplet size, velocity, and number density throughout a fuel spray and to utilize this measurement technique in laboratory benchmark experiments was demonstrated. The experiment to characterize fuel sprays is described. The experiments and data are useful for application to and validation of turbulent flow modeling to improve the design systems of future advanced technology engines.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AGARD Combust. Probl. in Turbine Eng. 10p (SEE N84-24732 15-25)
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Preliminary studies of combustor sensitivity to alternative fuels (1980)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Combustion problems associated with using alternative fuels ground power and aeropropulsion applications were studied. Rectangular sections designed to simulate large annular combustor test conditions were examined. The effects of using alternative fuels with reduced hydrogen content, increased aromatic content, and a broad variation in fuel property characteristics were also studied. Data of special interest were collected which include: flame radiation characteristics in the various combustor zones; the correponding increase in liner temperature from increased radiant heat flux; the effect of fuel bound nitrogen on oxides of nitrogen (NO sub x) emissions; and the overall total effect of fuel variations on exhaust emissions.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Aircraft Res. and Technol. for Future Fuels; p 153-160
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Flame Radiation Measurements (1983)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Spectral and total flame radiation measurements exhibited: (1) that radiant heat flux increases with vision combustor inlet air pressure; (2) the effect of fuel atomization characteristics on radiant heat flux; and (3) that a reduction in fuel hydrogen content produces a significant increase in radiant heat flux primarily at low combustor pressures.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Combust. Fundamentals Res.; p 199-206
    Format: application/pdf
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  • 7
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    Fuel Spray Diagnostics (1983)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Fundamental experimental data base for turbulent flow mixing models is provided and better prediction of the more complex turbulent chemical reacting flows. Analytical application to combustor design is provided and a better fundamental understanding of the combustion process.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Combust. Fundamentals Res.; p 29-38
    Format: application/pdf
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  • 8
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    A model propulsion simulator for evaluating counter rotating blade characteristics (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Three Model Propulsion Simulators (MPS) were designed and built to evaluate candidate counterrotation Ultra bypass fan model blade designs of nominally 2-ft (0.61 m) tip diameter for an advanced 'pusher-type' aircraft engine. These propulsion simulators (nominally 1/5 engine size) are capable of operation over a wide range of subsonic conditions and can deliver up to 750 shaft horsepower per rotor at rotor speeds of 10,000 rpm. The rotor thrust and torque, dynamic blade stresses, and system temperature data are transmitted through an integral telemetry system to facilitate data acquisition. Salient features of the design, instrumentation, and operation of these simulators are described in this paper.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: SAE PAPER 861715
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Sulfate and nitrate collected by filter sampling near the tropopause (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Filter samples collected near the tropopause with an F-106 aircraft and two Boeing 747 aircraft were analyzed for sulfate and nitrate ion content. Within the range of routine commercial flight altitudes (at or below 12.5 km), stratospheric mass mixing ratios for the winter-spring group averaged 0.26 ppbm for sulfate and 0.35 ppbm for nitrate. For the summer-fall group, stratosphere mixing ratios averaged 0.13 ppbm and 0.25 ppbm for sulfate and nitrate, respectively. Winter-spring group tropospheric mass mixing ratios averaged 0.08 ppbm for sulfate and 0.10 ppbm for nitrate, while summer-fall group tropospheric mixing ratios averaged 0.05 ppbm for sulfate and 0.08 ppbm for nitrate. Correlations of the filter data with available ozone data suggest that the sulfate and nitrate are transported from the stratosphere to the troposphere.
    Keywords: ENVIRONMENT POLLUTION
    Type: NASA-TP-1567 , E-073
    Format: application/pdf
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  • 10
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    NASA Global Atmospheric Sampling Program (GASP) data report for tapes VL0007 and VL0008 (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The Global Atmospheric Sampling Program (GASP) is obtaining measurements of atmospheric trace constituents in the upper troposphere and lower stratosphere using fully automated air sampling systems on board the NASA CV-990 research aircraft and four commerical B-747 aircraft in routine airline service. In-situ measurements of atmospheric ozone and water vapor, data from laboratory analysis of filters exposed in flight, and related flight and meteorological data obtained from September 1976 through January 1977 are reported. These data are now available on GASP tapes VL0007 & VL0008 from the National Climatic Center, Asheville, North Carolina. In addition to the GASP data, tropopause pressure fields obtained from NMC archives for the dates of the GASP flights are included on the data tape. Flight routes and dates, instrumentation, data processing procedures, and data tape specifications are described.
    Keywords: ENVIRONMENT POLLUTION
    Type: NASA-TM-73784 , E-9348
    Format: application/pdf
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