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  • AERODYNAMICS  (102)
  • EARTH RESOURCES AND REMOTE SENSING  (48)
  • Aircraft Stability and Control
  • GENERAL
  • 2005-2009
  • 1985-1989  (155)
  • 1988  (155)
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  • 2005-2009
  • 1985-1989  (155)
Year
  • 1
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    Multigrid acceleration of the flux-split Euler equations (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Keywords: AERODYNAMICS
    Type: AIAA Journal (ISSN 0001-1452); 26; 649-654
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    A full-potential theory analysis of the supersonic aerodynamics of a 60-deg delta wing-body configuration (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Experimental spanwise pressure distributions for a 60-deg delta wing/body of approximate fineness ratio 7.6 have been obtained and compared to predictions using full-potential theory. Analysis was performed at Mach 1.6 for angles of attack in the range 0.8 to 10 deg, and for Mach numbers ranging from 1.4 to 1.8 at lift coefficients 0.3 and 0.4. The intent of the study was to examine an attached flow approach for maneuver wing design in the presence of a fuselage. For the Mach number, angle-of-attack conditions considered, the full-potential theory accurately modeled the pressure distributions provided the flow remained attached. By combining the full-potential theory results with an empirical shock-induced separation criterion, it was found that the onset of shock-induced separation can be predicted. The investigation showed that, if an attached-flow approach is used with an empirical method of indicating shock-induced separation, the full-potential method is capable of being used as an effective tool for designing maneuver wings.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 88-0480
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Static performance of nonaxisymmetric nozzles with yaw thrust-vectoring vanes (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A static test was conducted in the static test facility of the Langley 16 ft Transonic Tunnel to evaluate the effects of post exit vane vectoring on nonaxisymmetric nozzles. Three baseline nozzles were tested: an unvectored two dimensional convergent nozzle, an unvectored two dimensional convergent-divergent nozzle, and a pitch vectored two dimensional convergent-divergent nozzle. Each nozzle geometry was tested with 3 exit aspect ratios (exit width divided by exit height) of 1.5, 2.5 and 4.0. Two post exit yaw vanes were externally mounted on the nozzle sidewalls at the nozzle exit to generate yaw thrust vectoring. Vane deflection angle (0, -20 and -30 deg), vane planform and vane curvature were varied during the test. Results indicate that the post exit vane concept produced resultant yaw vector angles which were always smaller than the geometric yaw vector angle. Losses in resultant thrust ratio increased with the magnitude of resultant yaw vector angle. The widest post exit vane produced the largest degree of flow turning, but vane curvature had little effect on thrust vectoring. Pitch vectoring was independent of yaw vectoring, indicating that multiaxis thrust vectoring is feasible for the nozzle concepts tested.
    Keywords: AERODYNAMICS
    Type: NASA-TP-2813 , L-16389 , NAS 1.60:2813
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Intercomparison of synthetic- and real-aperture radar observations of Arctic sea ice during winter MIZEX '87 (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Active microwave measurements were made of various sea ice forms in March and April 1987 during the Marginal Ice Zone Experiment, at 1, 5, 10, 18, and 35 GHz using a synthetic aperture radar (SAR) and helicopter and ship-based scatterometers. The X-band (9.8 GHz) SAR data were compared to the scatterometer data and it was determined that for 5 GHz and higher frequencies both the SAR and scatterometers can differentiate open water, new ice (5 to 30 cm), first-year ice with rubble (0.60 -1.5 m), and multiyear ice. The analysis further confirmed that the C-band (5 GHz) SAR's flying on ESA ERS-1 and Radarsat will differentiate the mentioned ice types.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: ESA, Proceedings of the 1988 International Geoscience and Remote Sensing Symposium (IGARSS) '88 on Remote Sensing: Moving Towards the 21st Century, Volume 3; p 1419-1422
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Static performance of an axisymmetric nozzle with post-exit vanes for multiaxis thrust vectoring (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An investigation was conducted in the static test facility of the Langley 16-Foot Transonic Tunnel to determine the flow-turning capability and the nozzle internal performance of an axisymmetric convergent-divergent nozzle with post-exit vanes installed for multiaxis thrust vectoring. The effects of vane curvature, vane location relative to the nozzle exit, number of vanes, and vane deflection angle were determined. A comparison of the post-exit-vane thrust-vectoring concept with other thrust-vectoring concepts is provided. All tests were conducted with no external flow, and nozzle pressure ratio was varied from 1.6 to 6.0.
    Keywords: AERODYNAMICS
    Type: NASA-TP-2800 , L-16371 , NAS 1.60:2800
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Evaluation of three turbulence models for the prediction of steady and unsteady airloads (1988)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Two dimensional quasi-three dimensional Navier-Stokes solvers were used to predict the static and dynamic airload characteristics of airfoils. The following three turbulence models were used: the Baldwin-Lomax algebraic model, the Johnson-King ODE model for maximum turbulent shear stress, and a two equation k-e model with law-of-the-wall boundary conditions. It was found that in attached flow the three models have good agreement with experimental data. In unsteady separated flows, these models give only a fair correlation with experimental data.
    Keywords: AERODYNAMICS
    Type: NASA-TM-101413 , E-4507 , NAS 1.15:101413 , AIAA PAPER 89-0609 , Aerospace Sciences Meeting; Jan 09, 1989 - Jan 12, 1989; Reno, NV; United States
    Format: application/pdf
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  • 7
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    Development of remote sensing techniques capable of delineating soils as an aid to soil survey (1988)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Eighty-one benchmark soils from Alabama, Georgia, Florida, Tennessee, and Mississippi were evaluated to determine the feasibility of spectrally differentiating among soil categories. Relationships among spectral properties that occur between soils and within soils were examined, using discriminant analysis. Soil spectral data were obtained from air-dried samples using an Exotech Model 20C field spectroradiometer (0.37 to 2.36 microns). Differentiating among the orders, suborders, great groups, and subgroups using reflectance spectra achieved varying percentages of accuracy. Six distinct reflectance curve forms were developed from the air-dried samples based on the shape and presence or absence of adsorption bands. Iron oxide and organic matter content were the dominant soil parameters affecting the spectral characteristics for differentiating among and between these soils.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-CR-182610 , NAS 1.26:182610 , ACARS-123187
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Remote sensing of forest canopy and leaf biochemical contents (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Recent research on the remote sensing of forest leaf and canopy biochemical contents suggests that the shortwave IR region contains this information; laboratory analyses of dry ground leaves have yielded reliable predictive relationships between both leaf nitrogen and lignin with near-IR spectra. Attention is given to the application of these laboratory techniques to a limited set of spectra from fresh, whole leaves of conifer species. The analysis of Airborne Imaging Spectrometer data reveals that total water content variations in deciduous forest canopies appear as overall shifts in the brightness of raw spectra.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Remote Sensing of Environment (ISSN 0034-4257); 24; 85-108
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Two-component LDV investigation of three-dimensional shock/turbulent boundary-layer interactions (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Keywords: AERODYNAMICS
    Type: AIAA Journal (ISSN 0001-1452); 26; 52-56
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Extension of a drought monitoring and vegetation classification methodology to the western Sahel (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Biomass of growing vegetation over large semiarid regions can be estimated by digital manipulation of data from the AVHRR on NOAA polar-orbiting satellites. Here, the African Sahel is classified using a methodology which incorporates both the normalized difference and CAUSE procedures for the monitoring of vegetation during drought conditions. Preliminary analysis of color IR photographs taken on Space Shuttle missions indicates that such photographs can be digitized, registered to maps and other images, and utilized to fill temporal gaps in the historical record of data from unmanned satellites.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Geocarto International (ISSN 1010-6049); 3; 29-36
    Format: text
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    NASA TECHNICAL REPORTS
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