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  • FLUID MECHANICS  (4)
  • 1
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    Preliminary results for a large angle oblique jet impingement and flow and for the effect of initial conditions on the near field of an axisymmetric jet (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The structure of an axisymmetric jet in the near field is discussed for jet noise and for jet impingment schemes for STOL aircraft. It is inferred from previous studies, and the inference is supported by analysis, that the scale and intensity of the turbulence structure at the jet exit plane are the important boundary conditions which effect the development of the flow in the near field. The techniques to study these effects while maintaining a uniform mean flow and the results which document the range of the initial conditions are presented. The large angle, oblique jet impingment condition is of interest in terms of the jet/flap interaction. Detailed turbulence data can be obtained with the specially constructed facility. The development of the flow and instrumentation system and initial data from the new facility are presented.
    Keywords: FLUID MECHANICS
    Type: NASA-CR-121257 , SAR-3
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    A study of the round jet/plane wall flow field (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Impingement angles, between the axisymmetric jet axis and the plane wall, from zero to 15 degrees have been examined for nozzle heights of 0.75, 1.0, 1.5 and 2.0 diameters and for: (1) a fully developed pipe flow, and (2) a relatively uniform exit velocity condition. Velocity measurements have been used to define isotach contours and to determine mass, momentum and energy flux values for the near field (within five diameters) of the jet. Surface pressure measurements have been used to define surface pressure forces and jet centerline trajectories. The geometric and flow conditions examined and the interpretation of the results have been motivated by the externally blown flap STOL aircraft application.
    Keywords: FLUID MECHANICS
    Type: NASA-CR-124604 , AR-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    The effect of exit conditions on the development of an axisymmetric turbulent free jet (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The mean flow in the near field of a submerged axisymmetric jet emitting from a plane wall is presented. An experimental configuration to provide a nearly uniform mean velocity profile with a core of homogeneous turbulence of variable intensity and scale was developed. Eight cases with intensity values of 0.004 less than or equal to U prime less than or equal to 0.035 and integral scales up to l sub x/R = 0.28 were investigated using conditional sampling techniques. It was found that the jet exhibits an increasing momentum flux in the near field. Contrary to expectation and the accepted assumption of ambient static pressure in a turbulent jet, results seem to be conclusive and borne out by comparison with published data. Both integral measures, mass and momentum flux ratios, are insensitive to exit turbulence variations, but, the detailed structure (including centerline velocity) variations with exit conditions are systematic and explainable.
    Keywords: FLUID MECHANICS
    Type: NASA-CR-138468
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Research on free and impinging jets for the development of STOL aircraft (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The effect of the exit plane conditions on the initial region of an axisymmetric jet was systematically investigated. An essentially top-hat mean velocity profile and a homogeneous turbulence structure were maintained at the exit plane for eight distinct scale and intensity conditions. Mass and momentum flux values are independent of the exit turbulence structure for the range investigated; however, a significant (approximately 25%) increase in the latter implies a pronounced static pressure decrement inside the jet. Details of the velocity profile and turbulence structure are influenced by the exit plane conditions. The three radial-axial components of the Reynolds stress tensor have been conditionally sampled and are analyzed to show the initial condition effects.
    Keywords: FLUID MECHANICS
    Type: NASA-CR-138031
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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