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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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    Ultraviolet spectrophotometer for measuring columnar atmospheric ozone from aircraft (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: An ultraviolet spectrophotometer (UVS) to measure downward solar fluxes from an aircraft or other high altitude platform is described. The UVS uses an ultraviolet diffuser to obtain large angular response with no aiming requirement, a twelve-position filter wheel with narrow (2-nm) and broad (20-nm) bandpass filters, and an ultraviolet photodiode. The columnar atmospheric ozone above the UVS (aircraft) is calculated from the ratios of the measured ultraviolet fluxes. Comparison with some Dobson station measurements gives agreement to 2%. Some UVS measured ozone profiles over the Pacific Ocean for November 1976 are shown to illustrate the instrument's performance.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 17; May 15
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Application of 3D aerodynamic/combustion model to combustor primary zone study (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A description is provided of the three-dimensional elliptic code for reacting flows used in the combustor design process during the program 'Small Gas Turbine Combustor Primary Zone Study' carried out by a U.S. company. The code, designated MARC-I (multidimensional aerodynamic recirculating combustion-Version I) is an adaptation of the model described by Mongia et al. (1979). The program has the objective to advance the technology of the small reverse-flow annular combustor design through an understanding of primary zone performance factors. The MARC-I code was used for performance predictions of both original designs and later modifications. A test program consisting of both primary zone sampling and overall combustor performance measurements was carried out. It was, therefore, possible to compare the analytical predictions with actual test measurements.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: AIAA PAPER 83-1265
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    NASA Global Atmospheric Sampling Program (GASP) data report for tape VL0015, VL0016, VL0017, VL0018, VL0019, and VL0020 (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This is the twelfth of a series of reports which describes the data currently available from GASP, including flight routes and dates, instrumentation, data processing procedures, and data tape specifications. In-situ measurements of atmospheric ozone, cabin ozone, carbon monoxide, water vapor, particles, clouds, condensation nuclei, filter samples and related meteorological and flight information obtained during 1732 flights of aircraft N533PA, N4711U, N655PA, and VH-EBE from January 5, 1978 through October 9, 1978 are reported. These data are now available from the National Climatic Center, Asheville, NC, 22801. In addition to the GASP data, tropopause pressures obtained from time ans space interpolation of National Meteorological Center archived data for the dates of the flights are included.
    Keywords: ENVIRONMENT POLLUTION
    Type: NASA-TM-81661 , E-679
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    NASA Global Atmospheric Sampling Program (GASP) data report for tape VL0014 (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The data currently available from GASP, including flight routes and dates, instrumentation, data processing procedures, and data tape specifications are described. Measurements of atmospheric ozone, cabin ozine, carbon monoxide, water vapor, particles, clouds, condensation nuclei, filter samples and related meteorological and flight information obtained during 562 flights of aircraft N533PA, N4711U, N655PA, and VH-EBE from October 3, 1977 through January 5, 1978 are reported. Data representing tropopause pressures obtained from time and space interpolation of National Meteorological Center archived data for the dates of the flights are included.
    Keywords: ENVIRONMENT POLLUTION
    Type: NASA-TM-81579 , E-549
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Ozone concentration in the cabin of a Gates Learjet measured simultaneously with atmospheric ozone concentrations (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A Gates Learjet Model 23 was instrumented with monitors to measure simultaneously the atmospheric and the cabin concentrations of ozone at altitudes up to 13 kilometers. Six data flights were made in February 1978. Results indicated that only a small amount of the atmospheric ozone is destroyed in the cabin pressurization system. Ozone concentrations measured in the cabin near the conditioned-air outlets were only slightly lower than the atmospheric ozone concentration. For the two cabin configurations tested, the ozone retention in the cabin was 63 and 41 percent of the atmospheric ozone concentration. Maximum cabin ozone concentration measured during these flights was 410 parts per billion by volume.
    Keywords: ENVIRONMENT POLLUTION
    Type: NASA-TP-1340 , E-9653
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Effect of operating conditions on the exhaust emissions from a gas turbine combustor (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Exhaust concentrations of total unburned hydrocarbons, carbon monoxide, and nitric oxide were measured from a single J-57 combustor liner installed in a 30 diameter test section. Tests were conducted over a range of inlet total pressures from 1 to 20 atmospheres, inlet total temperatures from 310 to 590 K, reference velocities from 8 to m/sec, and fuel-air ratios from 0.004 to 0.015. Most of the data were obtained using ASTM A-1 fuel; however, a limited number of tests was performed with natural gas fuel. Combustion efficiency and emission levels are correlated with operating conditions. Sampling error at operating conditions for which combustion efficiency was below about 90 percent resulted in abnormally low readings for hydrocarbon emissions.
    Keywords: PROPULSION SYSTEMS
    Type: NASA-TN-D-6661 , E-6432
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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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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    NASA TECHNICAL REPORTS
  • 9
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    Comparison of ozone measurement techniques using aircraft, balloon, and ground-based measurements (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: In order to verify the ultraviolet absorption technique used in the Global Atmospheric Sampling Program, two flight experiments were conducted employing several techniques, both in situ and remote, for measuring atmospheric ozone. The first experiment used the NASA CV-990 equipped with an ultraviolet absorption ozone monitor and an ultraviolet spectrophotometer, a balloon ozonesonde, and a Dobson station for determining and comparing the ozone concentration data. A second experiment compared ozone data from an automated sampling system aboard a B-747 with data from a manned system installed on the NASA CV-990 during a cross-country flight with both aircraft following the same flight path separated by 32 kilometers.
    Keywords: ENVIRONMENT POLLUTION
    Type: NASA-TM-X-3520 , E-8951
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Air assist fuel nozzle reduces aircraft gas turbine engine emissions at idle operation (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Reduction in unburned hydrocarbons from jet engine by use of air assist fuel nozzle is discussed. Operation of nozzle for improving combustion efficiency by improving fuel atomization is analyzed. Advantages to be achieved by air assist fuel nozzle are analyzed.
    Keywords: MACHINERY
    Type: LEW-11512
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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