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  • GEOPHYSICS  (184)
  • AIRCRAFT PROPULSION AND POWER  (41)
  • 1980-1984  (225)
  • 1981  (225)
  • 1
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    Report of the NASA working group on tropospheric program planning (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Increased understanding of the chemical phenomena occurring in the troposphere was the research goal. Emphasis was placed on tropospheric impact on environmental quality, including public health, agriculture, climate, and weather.
    Keywords: GEOPHYSICS
    Type: NASA-RP-1062 , L-13855
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    A theoretical assessment of the O3/H2O interference problem in the detection of natural levels of OH via laser induced fluorescence (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Theoretical calculations are presented which estimate the possible magnitude of the O3/H2O derived OH interference signal resulting from the use of the laser-induced fluorescence technique in measuring natural levels of tropospheric OH. Critical to this new assessment has been the measurement of the nascent OH quantum state distribution resulting from the reaction O(1D) + H2O yields 2OH, and an assessment of the subsequent rotational relaxation of the OH species when formed in high k levels.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters; 8; Jan. 198
    Format: text
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  • 3
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    On the prediction of swirling flowfields found in axisymmetric combustor geometries (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The paper reports research restricted to steady turbulence flow in axisymmetric geometries under low speed and nonreacting conditions. Numerical computations are performed for a basic two-dimensional axisymmetrical flow field similar to that found in a conventional gas turbine combustor. Calculations include a stairstep boundary representation of the expansion flow, a conventional k-epsilon turbulence model and realistic accomodation of swirl effects. A preliminary evaluation of the accuracy of computed flowfields is accomplished by comparisons with flow visualizations using neutrally-buoyant helium-filled soap bubbles as tracer particles. Comparisons of calculated results show good agreement, and it is found that a problem in swirling flows is the accuracy with which the sizes and shapes of the recirculation zones may be predicted, which may be attributed to the quality of the turbulence model.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: In: Fluid mechanics of combustion systems; June 22, 23, 1981; Boulder, CO
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Local effects of partly cloudy skies on solar and emitted radiations (1981)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Solar radiation measurements are made on a routine basis. Global solar, atmospheric emitted, downwelled diffuse solar, and direct solar radiation measurement systems are fully operational with the first two in continuous operation. Fractional cloud cover measurements are made from GOES imagery or from ground based whole sky photographs. Normalized global solar irradiance values for partly cloudy skies were correlated to fractional cloud cover.
    Keywords: GEOPHYSICS
    Type: NASA-CR-164694
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Comparison of stratospheric aerosol measurements over Poker Flat, Alaska, July, 1979 (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Stratospheric aerosols were collected at Poker Flat, Alaska, in July, 1979, to determine particle properties, confirm coincident satellite SAGE measurements, and compare similar results obtained with different airborne samplers. Because of the steep slopes in size-distribution curves for larger particles, it is found that properties such as concentrations, aerosol mass, and optical extinction are very sensitive to small errors in radii. It is calculated that the concentration measurements agree with photoelectric particle counter results when a 16% radius change is introduced. An 8% radius change matches our calculated sulfate mass with filter mass measurements. And a 13% radius change results in agreement between the calculated optical extinction and coincident SAGE satellite results. Recognizing that different instruments can produce 10-20% differences in measured sizes, it is believed the results of these comparative measurements of SAGE and in situ instruments are essentially in agreement.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters; 8; Jan. 198
    Format: text
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  • 6
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    JT8D engine performance retention (1981)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The attractive performance retention characteristics of the JT8D engine are described. Because of its moderate bypass ratio and turbine temperature, and stiff structural design, the performance retention versus flight cycles of the JT8D engine sets a standard that is difficult for other engines to equal. In addition, the significant benefits of refurbishment of the JT8D engine are presented. Cold section refurbishment offers thrust specific fuel consumption improvements of up to 2 percent and payback in less than a year, making a very attractive investment option for the airlines.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA. Lewis Res. Center Aircraft Engine Diagnostics; p 63-81
    Format: application/pdf
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  • 7
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    The use of the Eliassen-Palm flux as a diagnostic of wave, mean-flow interaction in a general circulation model (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Keywords: GEOPHYSICS
    Type: Illinois Univ. Middle Atmosphere Program. Handbook for MAP. Volume 2: (NASA-CR-175509); p 99-100
    Format: text
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  • 8
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    Ion streams in the magnetotail (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Ion mass spectrometer observations of low-temperature streaming plasmas in the earth's magnetotail are reported. Measurements in the energy per charge range 0 to 17 keV/e were made at geocentric radial distances less than 23 earth radii from the ISEE 1 spacecraft. Ion streams of solar wind origin in the magnetotail boundary layer and of ionospheric origin in the tail lobes and plasma sheet are described. A statistical study of some of the characteristics of the streams allows the inference that the central tail lobe plasmas are primarily constituted of ion streams of ionospheric origin and that the ionosphere is a significant contributor to the hot plasmas that form the plasma sheet.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 86; June 1
    Format: text
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  • 9
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    Plasma rest frame distributions of suprathermal ions in the earth's foreshock region (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The paper presents rest frame ion distributions computed from three-dimensional observations of upstream suprathermal ions made by the University of Iowa Quadrispherical Lepedea on ISEE-1. The observations are for a single inbound midmorning pass starting upstream from the ion foreshock and continuing across the quasi-spherical bow shock into the magnetosheath. The crossing of the ion foreshock boundary is marked by a several-minute burst of ions of temperature 100-200 eV moving along the IMF away from the bow shock at 500 km/s relative to the solar wind. The observation of these reflected ions is followed by an extended interval of diffuse ions of temperatures 2-3 keV flowing at about 250 km/s relative to the solar wind and persisting until the bow shock is crossed. Both types of suprathermal ions constitute roughly 2% of the total ion density and carry a parallel heat flux of 0.01 ergs/sq cm-s.
    Keywords: GEOPHYSICS
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  • 10
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    The ultraviolet dayglow. IV - The spectrum and excitation of singly ionized oxygen (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The emission line spectrum of singly ionized atomic oxygen (O II) dominates the day airglow spectrum in the extreme ultraviolet below 834 A. The strongest resonance line, at 834 A, is optically thick and an analysis of height profiles obtained from rocket observations between 140 and 265 km in specific viewing directions indicates that the principal excitation source is direct photoionization of neutral atomic oxygen. Strong emission at 538-539 A is most likely due to the quartet rather than the doublet transitions, which both occur at these wavelengths and which are not spectrally resolved in the data. The intensities of the weaker lines are consistent with recent laboratory measurements of transition branching ratios. Several strong O II lines near He I 584 produce severe contamination of low-altitude (less than 400 km) measurements of geocoronal helium emission made with thin-film broadband photometers.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 86; May 1
    Format: text
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