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  • 11
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    Parabolized Navier-Stokes analysis of three-dimensional supersonic and subsonic jet mixing problems (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Three-dimensional jet mixing problems are addressed by means of two parabolized Navier-Stokes models. The first of these analyzes supersonic, overexpanded or underexpanded nonaxisymmetric jets, and yields results that exhibit complex, three-dimensional interactions. The second model uses the same numerical framework as the first, and analyzes rectangular jets by means of a pressure-split formulation. Square and rectangular mixing jet problems that highlight this model's capabilities and exhibit the distortion of the nearfield jet contours associated with the streamwise vortices generated by two corner regions are presented.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 84-1525
    Format: text
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    NASA TECHNICAL REPORTS
  • 12
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    A Monte Carlo simulation of the Infrared Astronomical Satellite (IRAS) mission (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The development of a Monte Carlo simulation of numerous aspects of the IRAS mission is described. The formulations used in modelling the infrared sky, the radiation environment, and the telescope are discussed. The results of running the simulation with varying mission parameters are presented.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: AAS PAPER 83-383
    Format: text
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  • 13
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    Atmospheric turbulence on Venus - Venera 4, 5, 6, and Mariner 5 estimates (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Venus atmospheric turbulence from Venera 4, 5, 6 and Mariner 5 observations, discussing scaling laws and normalized signal-amplitude standard deviation
    Keywords: SPACE SCIENCES
    Type: ; YSICA STATUS SOLIDI
    Format: text
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  • 14
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    Investigation of line-of-sight propagation in dense atmosphere, phase 2 Final report, Jun. 1970 - Feb. 1971 (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Effect of microwave absorption and decimetric radio noise in Jovian atmospheres on radio communication in 1 to 10 GHz frequency band
    Keywords: PHYSICS, GENERAL
    Type: NASA-CR-114288
    Format: application/pdf
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  • 15
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    Shock noise features using the SCIPVIS code (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The numerical computational supersonic jet plume model SCIPVIS was analyzed in order to determine its effectiveness for predicting the complicated flow structure associated with supersonic shock containing jet plumes. The analysis focused on assessing the applicability of using this code for predicting the broadband shock noise radiation. The analysis was carried out for several exit Mach number cases (including 1.00, 1.41, and 1.99) covering both underexpanded and overexpanded flow conditions. The three primary turbulence closure models incorporated in the SCIPVIS code were utilized for comparisons to measured plume static pressure distributions. Among other results, the prediction of plume static pressures for all three nozzle exit Mach numbers was found to perform exceptionally well when compared with experimental data for both underexpanded and overexpanded cases. Computations performed using this code for calculating the average shock wavelength for the 1.99 exit Mach number case were shown to provide an excellent prediction of the peak frequency for broadband shock noise. The spatial variation of the turbulent kinetic energy was found to be in qualitative agreement with wedge hot-film measurements.
    Keywords: ACOUSTICS
    Type: AIAA PAPER 83-0705 , American Institute of Aeronautics and Astronautics, Aeroacoustics Conference; Apr 11, 1983 - Apr 13, 1983; Atlanta, GA
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  • 16
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    Shock-capturing parabolized Navier-Stokes model /SCIPVIS/ for the analysis of turbulent underexpanded jets (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A new computational model, SCIPVIS, has been developed to predict the multiple-cell wave/shock structure in under or over-expanded turbulent jets. SCIPVIS solves the parabolized Navier-Stokes jet mixing equations utilizing a shock-capturing approach in supersonic regions of the jet and a pressure-split approach in subsonic regions. Turbulence processes are represented by the solution of compressibility corrected two-equation turbulence models. The formation of Mach discs in the jet and the interactive turbulent mixing process occurring behind the disc are handled in a detailed fashion. SCIPVIS presently analyzes jets exhausting into a quiescent or supersonic external stream for which a single-pass spatial marching solution can be obtained. The iterative coupling of SCIPVIS with a potential flow solver for the analysis of subsonic/transonic external streams is under development.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 83-0704 , American Institute of Aeronautics and Astronautics, Aeroacoustics Conference; Apr 11, 1983 - Apr 13, 1983; Atlanta, GA
    Format: text
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  • 17
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    Evidence for severe microwave signal fading in the atmosphere of Venus due to turbulence (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Microwave signal fading in Venus atmosphere due to turbulence, discussing atmospheric dielectric permittivity variance
    Keywords: SPACE SCIENCES
    Type: ; ADEMIE DES SCIENCES
    Format: text
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  • 18
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    Atmospheric turbulence on Venus - Evidence for severe microwave signal fading from Venera 4 (1968)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Signal fading analysis from Venera 4 data in lower Venusian atmosphere
    Keywords: SPACE SCIENCES
    Type: NASA-CR-73346
    Format: application/pdf
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  • 19
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    Heat pipe thermal switch (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A thermal switch for controlling the dissipation of heat between a body is described. The thermal switch is comprised of a flexible bellows defining an expansible vapor chamber for a working fluid located between an evaporation and condensation chamber. Inside the bellows is located a coiled retaining spring and four axial metal mesh wicks, two of which have their central portions located inside of the spring while the other two have their central portions located between the spring and the side wall of the bellows. The wicks are terminated and are attached to the inner surfaces of the outer end walls of evaporation and condensation chambers respectively located adjacent to the heat source and heat sink. The inner surfaces of the end walls furthermore include grooves to provide flow channels of the working fluid to and from the wick ends. The evaporation and condensation chambers are connected by turnbuckles and tension springs to provide a set point adjustment for setting the gap between an interface plate on the condensation chamber and the heat sink.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Format: application/pdf
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  • 20
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    Interactive phenomena in supersonic jet mixing problems. II - Numerical studies (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Applications of the numerical techniques discussed in Part I of this article are presented. Fundamental wave/shear-layer interaction calculations are performed exhibiting the waves produced by high-speed turbulent mixing processes and the interactions of an expansion fan and shock wave with a developing shear layer. Calculations for an underexpanded supersonic jet into a supersonic external stream at different velocity ratios are presented which delineate betweeen weakly interactive and strongly interactive processes in the jet near field. Calculations for the multiple-cell shock structure of an underexpanded jet into still air exhibit the damping of wave intensities by the turbulence and compare quite favorably with available data.
    Keywords: AERODYNAMICS
    Type: AIAA Journal (ISSN 0001-1452); 22; 1395-140
    Format: text
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