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  • FLUID MECHANICS  (243)
  • ASTROPHYSICS
  • 1970-1974  (276)
  • 1
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    Flow fields and aerodynamic heating of space shuttle orbiters (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Wind tunnel simulations of flow fields and aerothermodynamics of space shuttle orbiters
    Keywords: FLUID MECHANICS
    Type: NASA SPACE SHUTTLE TECHNOL. CONF., VOL. 1 APR. 1971; P 21-73
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Solar gravitational deflection of radio waves measured by very-long-baseline interferometry (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Utilizing a four-antenna technique, simultaneous observations were made, at each end of an 845-km baseline, of the radio sources 3C279 and 3C273B, which are 10 deg apart in the sky. Differences in interferometric phases at 3.7-cm wavelength monitored near the time of the 1972 occultation of 3C279 by the sun, yielded a gravitational deflection of 0.99 plus or minus 0.03 times the value predicted by general relativity, corresponding to gamma = 0.98 plus or minus 0.06 (standard error).
    Keywords: ASTROPHYSICS
    Type: Physical Review Letters; 33; Dec. 30
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Experimental studies of hypersonic boundary-layer transition and effects of wind tunnel disturbances (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Boundary layer transition data on cones and free stream disturbance levels were measured in a hypersonic wind tunnel and Mach 8 variable density hypersonic tunnel. Transition data were obtained by using different conical models and techniques for detecting the location of transition. The disturbance levels were measured by using hot wire anemometry and pressure transducers. The transition Reynolds numbers obtained from the tests correlated well when the fluctuating pressures measured at the surface of conical models were used as a correlating parameter.
    Keywords: FLUID MECHANICS
    Type: NASA-TN-D-7453 , L-9154
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    The drag on oscillating flat plates in liquids at low Reynolds numbers (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Liquid flow about oscillating flat plates, determining drag coefficient relationships to low Reynolds number and period parameter from graphical representation
    Keywords: FLUID MECHANICS
    Type: ; 65-67 (
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    New diagnostic technique for the study of turbulent boundary-layer separation (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Description of a diagnostic technique for determining the unsteady character of turbulent boundary-layer separation. The technique uses thin platinum films mounted flush with the model surface. Voltages from these films provide measurements related to the flow character above the film. For illustration, results obtained by this technique are presented for the interaction of a hypersonic shock wave and a turbulent boundary layer, with and without separation.
    Keywords: FLUID MECHANICS
    Type: AIAA Journal; 12; Oct. 197
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  • 6
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    On the structure of hypersonic turbulent boundary layers. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Extensive hot-wire auto- and cross-correlation measurements obtained in a fully developed compressible turbulent boundary layer are presented. A tentative mechanism of turbulence production and growth in hypersonic flow suggested by these measurements is developed. This flow model is consistent with previous observations in incompressible flows. Detailed measurements of the mean properties of the hypersonic turbulent boundary layer are also presented and compared with results from various transformation and finite-difference prediction methods. It is shown that none of the theories predict all the properties of the hypersonic turbulent boundary layer and that additional measurements are needed to provide more adequate physics of turbulent processes for use in the various theories.
    Keywords: FLUID MECHANICS
    Type: Journal of Fluid Mechanics; 53; June 27
    Format: text
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  • 7
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    Hypersonic transitional boundary layers. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Surface thin-film gages have been used to determine the extent of the transition region, intermittency distribution, and disturbance convection velocities in the boundary layer on a sharp 5-deg half angle cone at Mach 7.4 in the Ames 3.5-ft Hypersonic Wind Tunnel. In addition, extensive hot wire space-time correlation measurements have been obtained in the wind-tunnel freestream and in the transitional hypersonic boundary layer on a cone-ogive-cylinder in the same facility. Disturbance convection velocities have been obtained from the longitudinal cross correlation measurements as a function of fluctuation scale and distance from the wall. The results of normal cross correlation measurements are also discussed.
    Keywords: FLUID MECHANICS
    Type: AIAA Journal; 10; June 197
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  • 8
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    Turbulent properties of a compressible boundary layer. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Turbulent shear-stress, eddy-viscosity, mixing-length, heat-flux and Prandtl number distributions across a hypersonic turbulent boundary layer have been determined from the 'time-averaged' conservation equations using experimental mean profile data obtained at several streamwise locations in a fully developed turbulent boundary layer with negligible pressure gradient. The eddy-viscosity, mixing-length and Prandtl number results show general agreement with previous incompressible and adiabatic compressible correlations. However, when the turbulent Prandtl number is defined using total enthalpy as opposed to static enthalpy no clear correlation of the results in the outer portion of the boundary layer could be obtained.
    Keywords: FLUID MECHANICS
    Type: AIAA Journal; 10; Nov. 197
    Format: text
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  • 9
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    Investigation of scaling characteristics for defining design environments due to transient ground winds and near-field, nonlinear acoustic fields (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: In order to establish a foundation of scaling laws for the highly nonlinear waves associated with the launch vehicle, the basic knowledge of the relationships among the paramaters pertinent to the energy dissipation process associated with the propagation of nonlinear pressure waves in thermoviscous media is required. The problem of interest is to experimentally investigate the temporal and spacial velocity profiles of fluid flow in a 3-inch open-end pipe of various lengths, produced by the propagation of nonlinear pressure waves for various diaphragm burst pressures of a pressure wave generator. As a result, temporal and spacial characteristics of wave propagation for a parametric set of nonlinear pressure waves in the pipe containing air under atmospheric conditions were determined. Velocity measurements at five sections along the pipes of up to 210 ft. in length were made with hot-film anemometers for five pressure waves produced by a piston. The piston was derived with diaphragm burst pressures at 20, 40, 60, 80 and 100 psi in the driver chamber of the pressure wave generator.
    Keywords: FLUID MECHANICS
    Type: NASA-CR-120101
    Format: application/pdf
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  • 10
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    Non-reacting and equilibrium chemically reacting turbulent boundary-layer flows. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Turbulent boundary-layer flows of nonreacting gases are predicted for both internal (nozzle) and external flows. Effects of favorable pressure gradients on two eddy viscosity models were studied in rocket and hypervelocity wind tunnel flows. Nozzle flows of equilibrium air with stagnation temperatures up to 10,000 K were computed. Predictions of equilibrium nitrogen flows through hypervelocity nozzles were compared with experimental data. A slender spherically blunted cone was studied at 70,000 ft altitude and 19,000 ft/sec in the earth's atmosphere. Comparisons with available experimental data showed good agreement. A computer program was developed and fully documented during this investigation for use by interested individuals.
    Keywords: FLUID MECHANICS
    Type: International Journal for Numerical Methods in Engineering; 7; 1, 19; 1973
    Format: text
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