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  • 1
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    A documentation of two- and three-dimensional shock-separated turbulent boundary layers (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A shock-related separation of a turbulent boundary layer has been studied and documented. The flow was that of an axisymmetric turbulent boundary layer over a 5.02-cm-diam cylinder that was aligned with the wind tunnel axis. The boundary layer was compressed by a 30 deg half-angle conical flare, with the cone axis inclined at an angle alpha to the cylinder axis. Nominal test conditions were P sub tau equals 1.7 atm and M sub infinity equals 2.85. Measurements were confined to the upper-symmetry, phi equals 0 deg, plane. Data are presented for the cases of alpha equal to 0. 5. and 10 deg and include mean surface pressures, streamwise and normal mean velocities, kinematic turbulent stresses and kinetic energies, as well as reverse-flow intermittencies. All data are given in tabular form; pressures, streamwise velocities, turbulent shear stresses, and kinetic energies are also presented graphically.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-101008 , A-88211 , NAS 1.15:101008
    Format: application/pdf
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  • 2
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    Vapor condensation rate at a turbulent liquid interface, for application to cryogenic hydrogen (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The condensation of hydrogen vapor onto turbulent liquid hydrogen is simulated experimentally using steam and water at elevated pressure, where water has a Prandtl number comparable to that of liquid hydrogen. A correlation is presented for the condensation rate in terms of the intensity and macroscale of the turbulence on the liquid side. The rate correlation should be applicable to low-gravity conditions at the higher turbulence intensities; at the lower turbulence intensities, however, the data are affected by thermal stratification resulting from buoyancy effects.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 88-0559
    Format: text
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  • 3
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    An experimental documentation of a separated trailing-edge flow at a transonic Mach number (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A detailed experiment on the separated flow field at a sharp trailing edge is described and documented. The separated flow is a result of sustained adverse pressure gradients. The experiment was conducted using an elongated airfoil-like model at a transonic Mach number and at a high Reynolds number of practical interest. Measurements made include surface pressures and detailed mean and turbulence flow quantities in the region just upstream of separation to downstream into the near-wake, following wake closure. The data obtained are presented mostly in tabular form. These data are of sufficient quality and detail to be useful as a test case for evaluating turbulence models and calculation methods.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-84290 , A-9074 , NAS 1.15:84290
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  • 4
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    Parabolized Navier-Stokes solutions of separation and trailing-edge flows (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A robust, iterative solution procedure is presented for the parabolized Navier-Stokes or higher order boundary layer equations as applied to subsonic viscous-inviscid interaction flows. The robustness of the present procedure is due, in part, to an improved algorithmic formulation. The present formulation is based on a reinterpretation of stability requirements for this class of algorithms and requires only second order accurate backward or central differences for all streamwise derivatives. Upstream influence is provided for through the algorithmic formulation and iterative sweeps in x. The primary contribution to robustness, however, is the boundary condition treatment, which imposes global constraints to control the convergence path. Discussed are successful calculations of subsonic, strong viscous-inviscid interactions, including separation. These results are consistent with Navier-Stokes solutions and triple deck theory.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-84378 , A-9394 , NAS 1.15:84378
    Format: application/pdf
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  • 5
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    A laser Doppler velocimeter approach for near-wall three-dimensional turbulence measurements (1990)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A near-wall laser Doppler velocimeter approach is described that relies on a beam-turning probe which makes possible the direct measurement of the crossflow velocity at a grazing incident and the placement of optical components close to the flow region of interest regardless of test facility size. Other important elements of the approach are the use of digital frequency processing, an optically smooth measurement surface, and observation of the sensing volume at 90 degrees. The combination was found to dramatically reduce noise-in-signal effects caused by surface light scattering. Turbulent boundary-layer data to within 20 microns (y(sup+) approximately equal to 1) of the surface are presented which illustrate the potential of the approach.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-102841 , A-90207 , NAS 1.15:102841 , International Symposium on Application of Laser Techniques in Fluid Mechanics; Jul 09, 1990 - Jul 12, 1990; Lisbon; Portugal
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  • 6
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    Vapor condensation at a turbulent liquid surface in systems with possible spaced-based applications (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Brown and Sonin's (1989) correlation is used to predict the condensation rate in three different systems and the results are compared with experimental data. These systems are: (1) a cylindrical system with turbulent mixing provided by an axial submerged jet, (2) a channel flow with grid-induced turbulence, and (3) a swirling film flow in a cylinder. The first and third system are of interest for space applications. While all the present data are from ground-based laboratory tests, the comparisons are restricted to conditions of low Richardson number, where the local condensation rate per unit area at the liquid surface is not affected by buoyancy effects.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 89-2846
    Format: text
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  • 7
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    Rate correlation for condensation of pure vapor on turbulent, subcooled liquid (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: An empirical correlation is presented for the condensation of pure vapor on a subcooled, turbulent liquid with a shear-free interface. The correlation expresses the dependence of the condensation rate on fluid properties, on the liquid-side turbulence (which is imposed from below), and on the effects of buoyancy in the interfacial thermal layer. The correlation is derived from experiments with steam and water, but under conditions which simulate typical cryogenic fluids.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: International Journal of Heat and Mass Transfer (ISSN 0017-9310); 33; 2001-201
    Format: text
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