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  • General Chemistry  (921)
  • FLUID MECHANICS
  • Humans
  • 1970-1974  (1,164)
  • 1960-1964
  • 1973  (1,164)
Collection
Keywords
Publisher
Years
  • 1970-1974  (1,164)
  • 1960-1964
Year
  • 1
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    Research on decreasing the noise of a jet (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-28
    Description: An investigation was conducted to determine the amount of noise reduction that could be obtained by communicating the axial vibrations of the nozzle of a jet engine to the suspension mechanism. Mathematical models were developed to establish the relationship of the parameters. The pressure pulsations in the jet were recorded by measuring microphones and the data were processed by statistical dynamics methods. It was determined that the jet noise spectrum was successfully changed with various mechanical suspension impedances.
    Keywords: FLUID MECHANICS
    Type: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 308-310
    Format: text
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  • 2
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    Boundary-layer losses (1973)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: The primary cause of losses in a turbine is the boundary layer that builds up on the blade and end-wall surfaces. Analytical and experimental methods for determining the friction, trailing edge, and mixing losses associated with the boundary layer are reported. The theory presented herein refers primarily to two dimensional blade section boundary layers. Methods for obtaining three dimensional blade plus end wall losses from the two-dimensional results are also discussed.
    Keywords: FLUID MECHANICS
    Type: Turbine Design and Appl., Vol. 2; p 93-124
    Format: text
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  • 3
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    Introduction to boundary-layer theory (1973)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: The pressure ratio across a turbine provides a certain amount of ideal energy that is available to the turbine for producing work. The portion of the ideal energy that is not converted to work is considered to be a loss. One of the more important and difficult aspects of turbine design is the prediction of the losses. The primary cause of losses is the boundary layer that develops on the blade and end wall surfaces. Boundary-layer theory is used to calculate the parameters needed to estimate viscous (friction) losses.
    Keywords: FLUID MECHANICS
    Type: Turbine Design and Appl., Vol. 2; p 57-92
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  • 4
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    Partial implicitization (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The steady-state solution to the full Navier-Stokes equations for complicated flows is generally difficult to obtain. The Burgers (1948) equation is used as a model of the Navier-Stokes equations. The steady-state solution is obtained by a one-step explicit technique resulting from a partial implicitization of the difference equation. Stability analysis shows that the technique is unconditionally stable, and numerical tests show the technique to be accurate.
    Keywords: FLUID MECHANICS
    Type: Journal of Computational Physics; 13; Nov. 197
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  • 5
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    Vibrational relaxation of carbon monoxide studied by two-wavelength infrared emission (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Experimental results are presented for the vibrational relaxation of pure carbon monoxide behind incident shock waves over the temperature range 4000 to 6300 K. The data were obtained as infrared emission from the fundamental and overtone vibrational band systems (in some of the experiments the two-band systems were recorded simultaneously). The data are consistent with present theories for the vibrational relaxation of diatomic molecules and can be interpreted in terms of an initial Boltzmann vibrational distribution relaxing toward final equilibrium via a continuous sequence of intermediate Boltzmann distributions.
    Keywords: FLUID MECHANICS
    Type: AIAA Journal; 11; Dec. 197
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  • 6
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    Pipe flow measurements of turbulence and ambiguity using laser-Doppler velocimetry (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The laser-Doppler ambiguities predicted by George and Lumley (1973) have been verified experimentally for turbulent pipe flows. Experiments were performed at Reynolds numbers from 5000 to 15,000 at the center line and near the wall. Ambiguity levels were measured from power spectral densities of FM demodulated laser signals and were compared with calculations based on the theory. The turbulent spectra for these water flows after accounting for the ambiguity were equivalent to hot-film measurements at similar Reynolds numbers. The feasibility of laser-Doppler measurements very close to the wall in shear flows is demonstrated.
    Keywords: FLUID MECHANICS
    Type: Journal of Fluid Mechanics; 61; Nov. 6
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  • 7
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    Parametric analysis of turbulent wall jets in still air. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: An examination has been made of all the data available on incompressible (nominally) plane wall jets in still air, supplementing these when necessary with some additional measurements. For a wall jet in still air, the chief mean flow qualities of interest are the maximum velocity, the inner length scale, and a total thickness, in addition to the wall stress. On the basis of the analysis, a (nominally) plane wall jet flow can be divided into an initial region, a fully developed flow region, and a confined wall jet flow region.
    Keywords: FLUID MECHANICS
    Type: Aeronautical Journal; 77; July 197
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  • 8
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    Numerical stability of boundary layers with massive blowing. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A basis is provided for examining the stability of so-called 'shooting methods' and to examine the stability of the method successfully applied by Nachtsheim and Green (1970) to boundary-layer flow with large injection and heat transfer. The stability of that method is examined and confirmed.
    Keywords: FLUID MECHANICS
    Type: AIAA Journal; 11; Aug. 197
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  • 9
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    The analysis of nonequilibrium, chemically reacting, supersonic flow in three dimensions using a bicharacteristics method. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A second-order numerical method of characteristics based on a bicharacteristics scheme was developed for the evaluation of steady, supersonic, nonequilibrium, chemically reacting flows. The absolute accuracy and order of accuracy of the method was shown by comparisons with spherical source flow and axisymmetric, nonequilibrium flows. Numerical results were obtained for elliptical and super-elliptical nozzles. These results illustrate the complex nature of three-dimensional flows and the inadequacy of quasi-three-dimensional methods which neglect cross flows.
    Keywords: FLUID MECHANICS
    Type: Journal of Computational Physics; 12; May 1973
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  • 10
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    Theory of shock waves in a moving medium (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The generalization is presented of the known gas dynamic Brinkly-Kirkwood method for the case of plane shock wave propagation in a steady-state moving medium.
    Keywords: FLUID MECHANICS
    Type: Astrometry and Astrophys., no. 9: Res. of the Sun and Stars (NASA-TT-F-760); p 191-194 refs
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