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  • 1
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    Measurement of spray combustion processes (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A free jet configuration was chosen for measuring noncombusting spray fields and hydrocarbon-air spray flames in an effort to develop computational models of the dynamic interaction between droplets and the gas phase and to verify and refine numerical models of the entire spray combustion process. The development of a spray combustion facility is described including techniques for laser measurements in spray combustion environments and methods for data acquisition, processing, displaying, and interpretation.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA. Lewis Research Center Combust. Fundamentals Res.; p 47-50
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    An integral turbulent kinetic energy analysis of free shear flows (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Mixing of coaxial streams is analyzed by application of integral techniques. An integrated turbulent kinetic energy (TKE) equation is solved simultaneously with the integral equations for the mean flow. Normalized TKE profile shapes are obtained from incompressible jet and shear layer experiments and are assumed to be applicable to all free turbulent flows. The shear stress at the midpoint of the mixing zone is assumed to be directly proportional to the local TKE, and dissipation is treated with a generalization of the model developed for isotropic turbulence. Although the analysis was developed for ducted flows, constant-pressure flows were approximated with the duct much larger than the jet. The axisymmetric flows under consideration were predicted with reasonable accuracy. Fairly good results were also obtained for the fully developed two-dimensional shear layers, which were computed as thin layers at the boundary of a large circular jet.
    Keywords: FLUID MECHANICS
    Type: NASA. Langley res. Center Free Turbulent Shear Flows, Vol. 1; p 577-628
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    NASA TECHNICAL REPORTS
  • 3
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    Mean velocity and turbulence measurements in a 90 deg curved duct with thin inlet boundary layer (1985)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The experimental database established by this investigation of the flow in a large rectangular turning duct is of benchmark quality. The experimental Reynolds numbers, Deans numbers and boundary layer characteristics are significantly different from previous benchmark curved-duct experimental parameters. This investigation extends the experimental database to higher Reynolds number and thinner entrance boundary layers. The 5% to 10% thick boundary layers, based on duct half-width, results in a large region of near-potential flow in the duct core surrounded by developing boundary layers with large crossflows. The turbulent entrance boundary layer case at R sub ed = 328,000 provides an incompressible flowfield which approaches real turbine blade cascade characteristics. The results of this investigation provide a challenging benchmark database for computational fluid dynamics code development.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-174811 , NAS 1.26:174811 , UTSI/85-08
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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