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  • FLUID MECHANICS  (72)
  • 2020-2024
  • 2010-2014
  • 1970-1974  (72)
  • 1955-1959
  • 1945-1949
  • 1973  (72)
Collection
Keywords
Years
  • 2020-2024
  • 2010-2014
  • 1970-1974  (72)
  • 1955-1959
  • 1945-1949
Year
  • 1
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    Survey of computational methods for three-dimensional supersonic inviscid flows with shocks (1973)
    In:  CASI
    Details
    Publication Date: 2012-05-22
    Description: Hyperbolic systems of partial differential equations governing supersonic inviscid flows are discussed and analyzed. Finite-difference analogues for integrating these systems in the interior of fluid domains are described from two points of view: a differential form approach and an integral form approach. The algorithms presented are analyzed for stability and accuracy. The concept of time splitting is discussed and supplied to these methods to achieve increased numerical efficiency. Techniques for treating conditions at the boundaries of the fluid domain and shock-wave discontinuities at surfaces within the domain are described.
    Keywords: FLUID MECHANICS
    Type: AGARD Advan. in Numerical Fluid Dyn.; 20 p
    Format: text
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  • 2
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    The design of a research water table (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A complete design for a research water table is presented. Following a brief discussion of the analogy between water and compressible-gas flows (hydraulic analogy), the components of the water table and their function are described. The major design considerations are discussed, and the final design is presented.
    Keywords: FLUID MECHANICS
    Type: NASA-CR-121255
    Format: application/pdf
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  • 3
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    Analysis of free turbulent shear flows by numerical methods (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Studies are described in which the effort was essentially directed to classes of problems where the phenomenologically interpreted effective transport coefficients could be absorbed by, and subsequently extracted from (by comparison with experimental data), appropriate coordinate transformations. The transformed system of differential equations could then be solved without further specifications or assumptions by numerical integration procedures. An attempt was made to delineate different regimes for which specific eddy viscosity models could be formulated. In particular, this would account for the carryover of turbulence from attached boundary layers, the transitory adjustment, and the asymptotic behavior of initially disturbed mixing regions. Such models were subsequently used in seeking solutions for the prescribed two-dimensional test cases, yielding a better insight into overall aspects of the exchange mechanisms.
    Keywords: FLUID MECHANICS
    Type: NASA. Langley Res. Center Free Turbulent Shear Flows, Vol. 1; p 185-232
    Format: application/pdf
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  • 4
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    Application of holography to the determination of flow conditions within the rotating blade row of a compressor (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The double-pulse, double-exposure holography technique was applied to visualize the flow field within a transonic compressor rotor with a tip speed of 1800 ft/sec. The principal objective was to visualize the shock waves created in the flow field which was supersonic relative to the rotating blade row. The upstream rotor blade bow shocks and, at high speed, the outermost portion of the leading edge passage shock were successfully observed in the holograms. Techniques were devised for locating these shocks in three dimensions, and the results were compared with theoretical predictions. Density changes between the two pulses due to motion of the shocks were large and, therefore, it was not possible to resolve the fringe systems in detail for the 100% speed conditions. However, gross features of the shocks were easily observed, and the upstream shocks were well displayed. In all cases the shock angles were somewhat larger than predicted by theory, and a distinct increase in angle near the outer wall was observed, which may be attributed to endwall boundary layer effects. The location and orientation of the observed leading edge passage shocks were in good agreement with static pressure contours obtained from measurements in the outer casing over the rotor tip.
    Keywords: FLUID MECHANICS
    Type: NASA-CR-121112 , PWA-4712
    Format: application/pdf
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  • 5
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    Characteristics of dilute gas-solids suspensions in drag reducing flow (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Measurements were performed on dilute flowing gas-solids suspensions and included data, with particles present, on gas friction factors, velocity profiles, turbulence intensity profiles, turbulent spectra, and particle velocity profiles. Glass beads of 10 to 60 micron diameter were suspended in air at Reynolds numbers of 10,000 to 25,000 and solids loading ratios from 0 to 4. Drag reduction was achieved for all particle sizes in vertical flow and for the smaller particle sizes in horizontal flow. The profile measurements in the vertical tube indicated that the presence of particles thickened the viscous sublayer. A quantitative theory based on particle-eddy interaction and viscous sublayer thickening has been proposed.
    Keywords: FLUID MECHANICS
    Type: NASA-CR-2267
    Format: application/pdf
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  • 6
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    A visual study of radial inward choked flow of liquid nitrogen (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A visual study of the radial inward choked flow of liquid nitrogen was conducted. Data and high speed moving pictures were obtained. The study indicated the following: (1) steady radial inward choked flow seems equivalent to steady choked flow through axisymmetric nozzles, (2) transient choked flows through the radial gap are not uniform and the discharge pattern appears as nonuniform impinging jets, and (3) the critical mass flow rate data for the transient case appear different from those of the steady case.
    Keywords: FLUID MECHANICS
    Type: NASA-TM-X-68283 , E-7605 , Cryog. Eng. Conf; Aug 08, 1973 - Aug 10, 1973; Atlanta,GA; United states
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  • 7
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    Application of the principle of corresponding states to two phase choked flow (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: It is pointed out that several fluids including methane, oxygen, and nitrogen appear to form an average parametric plot which indicates that the isenthalpic Joule-Thomson coefficient must nearly obey the principle of corresponding states. With this as a basis, it was assumed that there could be several thermodynamic flow processes which nearly obey the principle. An examination was made to determine whether two-phase choked flow could be one of them. The analysis is described and the results are given.
    Keywords: FLUID MECHANICS
    Type: NASA-TM-X-68193 , E-7340 , Natl. Meeting of the Am. Inst. of Chem. Engr.; Mar 11, 1973 - Mar 15, 1973; New Orleans; United States
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  • 8
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    A boundary layer approach to the analysis of atmospheric motion over a surface obstruction (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A boundary layer approach for the solution of the flow field induced over a two-dimensional surface obstruction, such as a building or other man-made structure, is proposed. Adopting a specific geometry in the form of a semi-elliptical cylinder, the characteristics of atmospheric shear flow over a rough terrain are coupled with the well-known boundary layer equations. Two approaches are presented to incorporate the pressure field and boundary conditions which exist within the large viscous region over the obstruction. The first considers a region in the immediate vicinity of the body in which the pressure distribution and outer boundary condition on the velocity are computed from potential theory for flow over the elliptical cylinder. The second approach considers a much larger region of influence, extending from the surface to the undisturbed flow at large heights above the obstruction. Methods which appear to provide an improved theoretical model of the flow over the ellipse, such as a technique for simulating the effect of the seperation regions upstream and downstream of the body, are also presented.
    Keywords: FLUID MECHANICS
    Type: NASA-CR-2182 , M109
    Format: application/pdf
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  • 9
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    Relaxation of the accelerating-gas boundary layer to the test-gas boundary layer on a flat plate in an expansion tube (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An analytic investigation of the relaxation of the accelerating-gas boundary layer to the test-gas boundary layer over a flat plate mounted in an expansion tube has been conducted. In this treatment, nitrogen has been considered as the test gas and helium as the accelerating gas. The problem is analyzed in two conically similar limits: (1) when the time lag between the arrival of the shock and the interface at the leading edge of the plate is very large, and (2) when this time lag is negligible. The transient laminar boundary-layer equations of a perfect binary-gas mixture are taken as the flow governing equations. These coupled equations have been solved numerically by Gauss-Seidel line-relaxation method. The results predict the transient behavior as well as the time required for an all-helium accelerating-gas boundary layer to relax to an all-nitrogen boundary layer.
    Keywords: FLUID MECHANICS
    Type: International Symposium on Recent Developments in Shock Tube Research; Jul 16, 1973 - Jul 19, 1973; Stanford, CA
    Format: text
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  • 10
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    Application of the principle of corresponding states to two-phase choked flow. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: If the possibility of applying the principle is valid, designers, using data from other fluids to support them, could apply the theory of their choice to fluids where there is little or no data, such as oxygen. Two-phase critical flow and critical flow pressure ratio of simple fluids through a nozzle are shown to nearly obey the principle of corresponding states. The normalization of corresponding states presented is supported by nitrogen and methane two-phase choked flow data. Since the reduced curves for nitrogen, oxygen, and methane are so close, it is felt that oxygen two-phase choked flow can be predicted using corresponding states reduction and relying on nitrogen and methane data to establish the appropriate theory to use.
    Keywords: FLUID MECHANICS
    Type: National Meeting of the American Institute of Chemical Engineers; Mar 11, 1973 - Mar 15, 1973; New Orleans, LA
    Format: text
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