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  • Other Sources  (7)
  • 1
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    Design of a 4 1/2 stage turbine with a stage loading factor of 4.66 and high specific work output (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The aerodynamic design of a highly loaded multistage fan drive turbine is discussed. Turbine flowpath and airfoil sections are presented along with respective pressure and velocity distributions. Vibrational modes are identified in the expected turbine operating range.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-CR-2659 , PWA-5101
    Format: application/pdf
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  • 2
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    Atmospheric variations - Vacillations and index cycles (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Zonal indices, momentum flux, and mean and perturbation kinetic energies of the Southern Hemisphere upper troposphere, derived from the EOLE constant density balloon data set, are found to possess strong 18-23 day variations which are statistically significant to a posteriori levels. Cross-spectra and phase relationships suggest that the variation appears as a barotropic interaction between the middle latitude mean westerlies and ultra large-scale perturbations. Long-period and high-amplitude variations in energy conversion between eddy and mean kinetic energies are found which average out in the long term mean to be very small and positive, consistent with previously measured average hemispheric energetics. Furthermore, the variation is shown to possess an ultra-long wave preference. Examination of two independent data sources, time series of total ozone and stratospheric thickness data from the Selective Chopper Radiometer, suggests that the periodicity is a property of general hemispheric motion rather than just a property of the EOLE data set.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Journal of the Atmospheric Sciences; 32; July 197
    Format: text
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  • 3
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    Interpretations of the EOLE experiment. I - Temporal variation of Eulerian quantities (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The EOLE data were obtained on the basis of the interrogation of nearly 500 constant density balloons by a satellite in a 50 deg inclined orbit with an orbital time of about 100 min. The isosteric surface in which the balloons operated closely approximates the 200-mb isobaric surface. Ambient temperature and pressure were determined by instruments. Lagrangian velocities were calculated from balloon displacements between successive satellite orbits. The properties of the EOLE data are considered together with averaging schemes and data problems, time sections, and questions of hemispheric energetics.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Journal of the Atmospheric Sciences; 31; Oct. 197
    Format: text
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  • 4
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    Stratospheric long waves - Comparison of thermal structure in the Northern and Southern Hemispheres (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Stratospheric radiance and temperature data obtained in the Northern and Southern Hemispheres during 1971 and 1972 are analyzed in order to compare planetary-wave behavior in both hemispheres. The data sources include the reduced radiance data of the Nimbus 4 selective chopper radiometer, National Meteorological Center gridded data, and Eole constant-level balloon data. Large-amplitude wave oscillations with energy in the period range from 20 to 30 days are observed along with the eastward propagation of planetary wave 2 in the Southern Hemisphere and a strong vertical coherence in wave phase at all levels between 200 mb and the upper stratosphere. The results show that: (1) despite stationary forcing, eastward phase progression occurs for wave 2 in the south as well as during the amplification phase of wave 1 in both hemispheres; (2) the upper stratosphere in midwinter contains regions of apparent barotropic instability, especially in the south; (3) wave number 2 amplitudes grow from very low values in early winter to high values in late winter; (4) the meridional amplitude structure is similar in the upper stratosphere in both hemispheres; and (5) the equatorward extent of waves is directly related to zonal wind speed in the upper stratosphere.
    Keywords: GEOPHYSICS
    Type: Journal of the Atmospheric Sciences; 33; Aug. 197
    Format: text
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  • 5
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    Interpretations of the EOLE experiment. II - Spatial variation of transient and stationary modes (1975)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: An upper tropospheric and hemispheric scale data set, resulting from the EOLE constant density balloon experiment (conducted between August 1971 and July 1972) is used to study the spatial variation of various measured and derived fields. The quality and density of the data set is shown to be sufficient for such a study during the Southern Hemisphere spring, summer and autumn of the data period but inadequate during winter. The stationary modes of the Southern Hemisphere are shown to be relatively weak compared to their Northern Hemisphere counterparts and possess distinct seasonal phase shifts. The transient fields, on the other hand, show definite longitudinal anomalies in their seasonal mean properties with magnitudes up to thrice the zonal average. The transient fields show little seasonal variability in position. Furthermore, it appears that most of their magnitude results from the contribution of a relatively few but extremely intense disturbances which appear to possess a fairly regular variability in the 18-23 day range.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Journal of the Atmospheric Sciences; 32; Sept
    Format: text
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  • 6
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    New functional redundancy approaches for attitude control thruster systems (1968)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Functional redundancy safeguards for inert gas attitude control thruster systems
    Keywords: AUXILIARY SYSTEMS
    Type: NASA-CR-73231
    Format: application/pdf
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  • 7
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    The low-latitude circulation of Mars (1977)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: A steady-state two-layer atmospheric model is used in an attempt to simulate the circulation of the equatorial regions of Mars, with consideration of both thermal and mechanical orographic effects. A steady-state solution is sought with the aim of producing mean seasonal circulations upon which tides can be superimposed, and the relative importance of orographic forcing at low latitudes is evaluated. It is assumed that the atmospheres over a topographic feature and over flat terrain possess the same radiative and convective properties, simple dissipation laws are introduced which represent a surface drag effect, and six first-order difference equations are obtained and then reduced to two linear complex second-order coupled difference equations. Analysis of the response of the equinoctial basic wind field to a Gaussian orographic feature situated at the equator and zero deg longitude reveals a number of similarities and differences between the Martian and terrestrial responses. Most of the similarities are explained in terms of the dynamics of a rotating atmosphere, while the major differences are at least partially explained by the different optical properties, lower boundaries, and smaller mass of the Martian atmosphere.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 30; Apr. 197
    Format: text
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