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  • 1
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    Orderly three-dimensional processes in turbulent boundary layers on ablating bodies (1968)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Orderly three dimensional processes in turbulent boundary layers on biconic, concave, and convex ablating bodies in Mach 7 airstream
    Keywords: THERMODYNAMICS AND COMBUSTION
    Type: AGARD HYPERSONIC BOUNDARY LAYERS AND FLOW FIELDS MAY 1968 (SEE N69-10186 01-01)
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  • 2
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    Topological classification of flow separation on three-dimensional bodies (1986)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: In the study of three-dimensional, separated flows, a topological approach to separation and a phenomenological approach have been considered. The topological approach is based on ideas of Poincare (1928), while the phenomenological approach distinguishes between 'open' and 'closed' separation as posed by Wang (1974). In the present paper, the topological description provided by Legendre (1956, 1965, 1982) is considered, taking into account its utilization by Tobak and Peake (1979, 1982). An attempt is made to provide a more complete framework for the description of separated as well as attached flows. Nomenclature is introduced to describe the topology of the skin-friction-line portraits on a three-dimensional body. The topological ideas are illustrated by the use of hypothetical oil-flow experiments supplemented with actual flow-visualization data when possible.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 86-0485
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  • 3
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    Observations, theoretical ideas and modeling of turbulent flows: Past, present and future (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Turbulence was analyzed in a historical context featuring the interactions between observations, theoretical ideas, and modeling within three successive movements. These are identified as predominantly statistical, structural and deterministic. The statistical movement is criticized for its failure to deal with the structural elements observed in turbulent flows. The structural movement is criticized for its failure to embody observed structural elements within a formal theory. The deterministic movement is described as having the potential of overcoming these deficiencies by allowing structural elements to exhibit chaotic behavior that is nevertheless embodied within a theory. Four major ideas of this movement are described: bifurcation theory, strange attractors, fractals, and the renormalization group. A framework for the future study of turbulent flows is proposed, based on the premises of the deterministic movement.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-86679 , REPT-85072 , NAS 1.15:86679
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  • 4
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    Theory for radiatively driven harmonic acoustic waves in a confined gas. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: A detailed theoretical study is made of radiatively driven acoustic waves inside a closed cylindrical tube. The formulation accounts for all the essential phenomena for a gas in vibrational equilibrium - namely, gas motion, longitudinal and radial viscous dissipation, longitudinal and radial heat conduction, and radiative transfer with spectral detail included. An approximate expression is derived for the pressure response. This solution is applicable to arbitrary spectral distribution of the radiative absorption coefficient, under conditions attainable in the laboratory. The solution includes both tuned and untuned acoustic conditions as well as the spectrophone limit - that is, the condition where the length of the tube is much smaller than the length of the acoustic wave. The influence of spectral detail on the pressure response is illustrated.
    Keywords: THERMODYNAMICS AND COMBUSTION
    Type: AD-776848 , AFOSR-74-0403TR , Physics of Fluids; 16; Aug. 197
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  • 5
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    Experiments on radiatively driven harmonic acoustic waves in a confined gas. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Measurements are presented of the acoustic pressure resulting from the periodic absorption and emission of radiative energy by an infrared-active gas contained in a closed, cylindrical tube. The acoustic waves are generated by means of an external, sinusoidally time-modulated blackbody source. The pressure measurements are for both resonant and nonresonant conditions at acoustic frequencies from about 60 to 600 Hz. Comparison of the measurements with predictions shows that the response is due primarily to the modified-classical acoustic wave, but that a small contribution from the so-called radiation-induced wave can be measured in certain of the tests. Strong effects of vibrational nonequilibrium, similar to those observed previously in spectrophone studies, were found in some of the tests.
    Keywords: THERMODYNAMICS AND COMBUSTION
    Type: Physics of Fluids; 16; Aug. 197
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  • 6
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    Flow visualization studies of bodies with square cross sections (1983)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: A water-tunnel study was conducted of four bodies. A solution of sodium fluorescein coating the body provided visualization of vortices and feeding sheets and isolated dots of methyl blue dye provided visualization of stream lines. These data, along with published oil-flow photos, were analyzed to develop the topological representation of the flows in cross-flow planes. Presented are the development of the flow along the body at fixed angles of attack and at a fixed body station with changes in angle of attack. Effects of roll angle, body corner radius, and nose bluntness are illustrated.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 83-0563 , American Institute of Aeronautics and Astronautics, Aerospace Sciences Meeting; Jan 10, 1983 - Jan 13, 1983; Reno, NV
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  • 7
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    Ballistic range tests of ablating and nonablating slender cones (1970)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Ballistic range tests to study ablation effects on aerodynamic characteristics of ablating and nonablating slender cones
    Keywords: THERMODYNAMICS AND COMBUSTION
    Type: AIAA PAPER 69-179 , ; ADEMIE DES SCIENCES|AMERICAN INST. OF AERONAUTICS AND ASTRONAUTICS, AEROSPACE SCIENCES MEETING, 7TH; Jan 20, 1969 - Jan 22, 1969; NEW YORK, NY
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  • 8
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    Ballistic range tests of ablating and nonablating slender cones. (1969)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Ballistic range tests to study ablation effects on aerodynamic characteristics of ablating and nonablating slender cones
    Keywords: THERMODYNAMICS AND COMBUSTION
    Type: AIAA PAPER 69-179 , AMERICAN INST. OF AERONAUTICS AND ASTRONAUTICS, AEROSPACE SCIENCES MEETING; Jan 20, 1969 - Jan 22, 1969; NEW YORK, NY
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  • 9
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    Orderly three-dimensional processes in turbulent boundary layers on ablating bodies (1968)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Flow model for three dimensional processes in turbulent boundary layers of ablating hypersonic Plexiglas bodies
    Keywords: THERMODYNAMICS AND COMBUSTION
    Type: NASA-TM-X-61188 , SPEC. MEETING ON HYPERSONIC BOUNDARY LAYERS AND FLOW FIELDS; May 01, 1968 - May 03, 1968; LONDON
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