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  • METEOROLOGY AND CLIMATOLOGY  (86)
  • Aircraft Stability and Control
  • FLUID MECHANICS AND HEAT TRANSFER
  • GENERAL
  • 2005-2009
  • 1980-1984  (140)
  • 1955-1959
  • 1984  (140)
Collection
Keywords
Years
  • 2005-2009
  • 1980-1984  (140)
  • 1955-1959
Year
  • 1
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    The 3D inelastic analysis methods for hot section components (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Advanced 3-D inelastic structural/stress analysis methods and solution strategies for more accurate and yet more cost-effective analysis of combustors, turbine blades, and vanes are being developed. The approach is to develop four different theories, one linear and three higher order with increasing complexities including embedded singularities. Progress in each area is reported.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA. Lewis Research Center Turbine Engine Hot Section Technology, 1984; 3 p
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Implications of the stratospheric water vapor distribution as determined from the Nimbus 7 LIMS experiment (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The LIMS experiment on Nimbus 7 has provided new results on the stratospheric water vapor distribution. The data show (1) a latitudinal gradient with mixing ratios that increase by a factor of 2 from equator to + or - 60 degrees at 50 mb, (2) most of the time there is a fairly uniform mixing ratio of 5 ppmv at high latitudes, but more variation exists during winter, (3) a well-developed hygropause at low to midlatitudes of the lower stratosphere, (4) a source region of water vapor in the upper stratospehere to lower mesosphere that is consistent with methane oxidation chemistry, at least within the uncertainties of the data, (5) an apparent zonal mean H2O distribution that is consistent with the circulation proposed by Brewer in 1949, and (6) a zonal mean distribution in the lower stratosphere that is consistent with the idea of quasi-isentropic transport by eddies in the meridional direction. Limits to the use of the data in the refinement of our understanding of the stratospheric water vapor budget are noted.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Journal of the Atmospheric Sciences (ISSN 0022-4928); 41; 2934-294
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Evidence for equatorial Kelvin modes in Nimbus-7 LIMS (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Equatorial Kelvin waves have emerged as an important source of westerly momentum for the tropical stratosphere. The present investigation is concerned with an analysis of remotely derived temperatures from Nimbus-7 LIMS (Limb Infrared Monitor of the Stratosphere). It is found that eastward propagating disturbances are present in two independent LIMS data sets. The disturbances manifest themselves consistently at several levels throughout the stratosphere and account for much of the tropical temperature variance out to latitudes where extratropical signals become large. Compelling evidence is found for several distinct phase velocities. Spectral analysis indicates isolated eastward variance at principally two frequencies for both wavenumbers.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Journal of the Atmospheric Sciences (ISSN 0022-4928); 41; 220-235
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Thermal conductance of pressed copper contacts at liquid helium temperatures (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA Journal (ISSN 0001-1452); 22; 1810-181
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Practicality of electronic beam steering for MST/ST radars, part 6.2A (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Electronic beam steering is described as complex and expensive. The Sunset implementation of electronic steering is described, and it is demonstrated that such systems are cost effective, versatile, and no more complex than fixed beam alternatives, provided three or more beams are needed. The problem of determining accurate meteorological wind components in the presence of spatial variation is considered. A cost comparison of steerable and fixed systems allowing solution of this problem is given. The concepts and relations involved in phase steering are given, followed by the description of the Sunset ST radar steering system. The implications are discussed, references to the competing SAD method are provided, and a recommendation concerning the design of the future Doppler ST/MST systems is made.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: International Council of Scientific Unions Middle Atmosphere Program: Handbook for MAP. Vol. 14; p 253-256
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    The Use of Available Potential Energy to Evaluate Two GLAS FGGE Data Sets (1984)
    In:  CASI
    Details
    Publication Date: 2014-09-16
    Description: Meteorological data derived from satellites provided an essential component of the FGGE data sets, especially in data sparse regions of the globe. The impact of satellite derived observations on objective analyses and numerical model predictions are investigated. The FGGE data sets and resulting numerical forecasts and the ability to define the available potential energy of the atmosphere, and its relationship to synoptic scale features such as extratropical cyclones are studied.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA. Goddard Space Flight Center Global Scale Atmospheric Processes Res. Program Review; p 115
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Evaluation of SIR-B data for identifying rainfall event occurrence and intensity (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The utility of shuttle imaging radar-B (SIR-B) data for the detection and measurement of rainfall events is to be investigated. The investigation is described along with the approach for data acquisition, handling, and analysis. Anticipated results are also considered. The CROPCAST rainfall estimation technique is discussed.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: JPL The SIR-B Sci. Invest. Plan; 2 p
    Format: text
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  • 8
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    Statistical analysis of direct-strike lightning data (1980 to 1982) (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Electromagnetic measurements are being made during direct lightning strikes by NASA Langley Center using a specially instrumented F-106B aircraft. The research is to aid refinement, characterization, and understanding of the lightning-aircraft interaction process and the lightning hazards to aircraft. Statistical methods are applied to characterize some aspects of the lightning data obtained from 176 strikes to the aircraft. Specific attention is given to the problem of estimating the upper extreme quantiles of the distributions of peak-to-peak values for currents and rates of change in the magnetic and flux densities. A formal treatment via a general location-scale family of models allows the estimation method to be adapted to the realized shapes the distributions. The shapes are examined by probability plotting methods.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA-TP-2252 , L-15686 , NAS 1.60:2252
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Rapid weather information dissemination in Florida (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The development of the Florida Agricultural Services and Technology (FAST) plan to provide ports for users to call for weather information is described. FAST is based on the Satellite Frost Forecast System, which makes a broad base of weather data available to its users. The methods used for acquisition and dissemination of data from various networks under the FAST plan are examined. The system provides color coded IR or thermal maps, precipitation maps, and textural forecast information. A diagram of the system is provided.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Hot-flow tests of a series of 10-percent-scale turbofan forced mixing nozzles (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An approximately 1/10-scale model of a mixed-flow exhaust system was tested in a static facility with fully simulated hot-flow cruise and takeoff conditions. Nine mixer geometries with 12 to 24 lobes were tested. The areas of the core and fan stream were held constant to maintain a bypass ratio of approximately 5. The research results presented in this report were obtained as part of a program directed toward developing an improved mixer design methodology by using a combined analytical and experimental approach. The effects of lobe spacing, lobe penetration, lobe-to-centerbody gap, lobe contour, and scalloping of the radial side walls were investigated. Test measurements included total pressure and temperature surveys, flow angularity surveys, and wall and centerbody surface static pressure measurements. Contour plots at various stations in the mixing region are presented to show the mixing effectiveness for the various lobe geometries.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TP-2268 , E-1746 , NAS 1.60:2268
    Format: application/pdf
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