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  • General Chemistry  (1,021)
  • FLUID MECHANICS
  • Humans
  • 1970-1974  (1,272)
  • 1960-1964
  • 1972  (1,272)
Collection
Keywords
Publisher
Years
  • 1970-1974  (1,272)
  • 1960-1964
Year
  • 1
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    Liquid-propellant dynamics and suppression (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: Technology related to liquid-propellant interactions with space shuttle vehicles is reviewed. Potential problems unique to the shuttle include liquid-structure interactions resulting from coupled lateral and longitudinal deformations, traveling wave phenomena at shallow propellant levels, and liquid impact during abort, staging, or docking. Technology efforts to define the slosh dynamics under shuttle operating conditions are described with emphasis on analytical representations of the liquid by finite-element and marker-and-cell methods. In addition, slosh suppression is discussed and includes baffle damping and pressure loads for tanks fitted with multiple baffles both above and below the undisturbed liquid surface.
    Keywords: FLUID MECHANICS
    Type: NASA Space Shuttle Technol. Conf.; p 139-174
    Format: text
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  • 2
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    Thermodynamic and fluid-dynamic concepts (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: Some of the fundamental concepts of thermodynamics and compressible fluid mechanics are reviewed. The concepts treated are those that are considered necessary to analyze the flow and energy transfer processes occurring in a turbine.
    Keywords: FLUID MECHANICS
    Type: Turbine Design and Appl., Vol. 1; p 1-20
    Format: text
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  • 3
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    Evaluation of boundary layer transition criteria for space shuttle orbiter entry (1972)
    In:  CASI
    Details
    Publication Date: 2006-07-18
    Description: A comparison was made of the effect of boundary layer transition on center-line heating in a conical and a normal-shock flow field. It was shown that the time of transition onset (and, hence, the heating parameter) is significantly influenced by the choice of transition criterion in the normal-shock flow but that this parameter is much less sensitive to the transition criterion in a conical flow field. An evaluation of the effects of boundary layer transition on center-line heating in the conical flow field has shown that the temperatures are less affected by the use of various transition crieria than are heat loads. This difference is due to the delay in the time of transition onset predicted by those criteria with high transition Reynolds numbers. The criteria which predict the most severe thermal environment are those of fully turbulent flow throughout the entry, because transition occurs early in the trajectory for each of these criteria, they tend to predict similar values of maximum temperature and total heat load especially at center-line locations aft of 0.6. Evaluation of center-line heating generated by various trajectory shaping approaches has shown that the maximum surface temperature distribution was not significantly affected by the shaping technique. However, the heat load distribution is influenced, particularly on the forward portion of the vehicle.
    Keywords: FLUID MECHANICS
    Type: Space Shuttle Aerothermodyn. Technol. Conf., vol. 2; p 683-704
    Format: text
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  • 4
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    Space shuttle booster multi-engine base flow analysis (1972)
    In:  CASI
    Details
    Publication Date: 2006-07-18
    Description: A comprehensive review of currently available techniques pertinent to several prominent aspects of the base thermal problem of the space shuttle booster is given along with a brief review of experimental results. A tractable engineering analysis, capable of predicting the power-on base pressure, base heating, and other base thermal environmental conditions, such as base gas temperature, is presented and used for an analysis of various space shuttle booster configurations. The analysis consists of a rational combination of theoretical treatments of the prominent flow interaction phenomena in the base region. These theories consider jet mixing, plume flow, axisymmetric flow effects, base injection, recirculating flow dynamics, and various modes of heat transfer. Such effects as initial boundary layer expansion at the nozzle lip, reattachment, recompression, choked vent flow, and nonisoenergetic mixing processes are included in the analysis. A unified method was developed and programmed to numerically obtain compatible solutions for the various flow field components in both flight and ground test conditions. Preliminary prediction for a 12-engine space shuttle booster base thermal environment was obtained for a typical trajectory history. Theoretical predictions were also obtained for some clustered-engine experimental conditions. Results indicate good agreement between the data and theoretical predicitons.
    Keywords: FLUID MECHANICS
    Type: NASA. Langley Res. Center Space Shuttle Aerothermodyn. Technol. Conf., vol. 2; p 519-605
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  • 5
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    The structure of shock wave in a gas consisting of ideally elastic, rigid spherical molecules (1972)
    In:  CASI
    Details
    Publication Date: 2006-04-24
    Description: Principal approaches are examined to the theoretical study of the shock layer structure. The choice of a molecular model is discussed and three procedures are formulated. These include a numerical calculation method, solution of the kinetic relaxation equation, and solution of the Boltzmann equation.
    Keywords: FLUID MECHANICS
    Type: Numerical Methods in the Theory of Rarefied Gases; p 64-78
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  • 6
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    Transfer phenomena in reacting gas mixtures (1972)
    In:  CASI
    Details
    Publication Date: 2006-04-24
    Description: In considering transfer phenomena in reacting gas mixtures, the following topics are discussed: (1) dynamics of paired collisions; (2) Enskog method for solving the Boltzmann equation, taking into account inelastic collisions; (3) use of the variation principle for approximate solutions; (4) computations of inelastic bracketed expressions; (5) calculation of collision integrals; and (6) formulas for transfer coefficients.
    Keywords: FLUID MECHANICS
    Type: Numerical Methods in the Theory of Rarefied Gases; p 147-179
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  • 7
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    Calculation of compressible adverse pressure gradient turbulent boundary layers. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Difficulties encountered in computing profile shapes in supersonic turbulent boundary layers with large pressure gradients, which result from a disagreement between data and theory, are investigated. Possible reasons given by various authors for this disagreement are discussed. Initial results seem to indicate that conventional reasons do not account for the observed difficulties. However, inclusion of the effect of curvature upon turbulent mixing has brought an improvement in calculations. Possible three-dimensional effects are also examined.
    Keywords: FLUID MECHANICS
    Type: AIAA Journal; 10; Feb. 197
    Format: text
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  • 8
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    Variational solutions by the use of stepwise constant functions. I - Linear case. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Demonstration that accurate solutions to the integral equation or to the extremal function can be easily obtained by the variational method in many cases when a stepwise constant function is used for the trial function. The evaluation procedure is simple and straightforward; integrals of the kernel function can be evaluated analytically; the method provides, when the solution involves singularities, the best mean value across the singularity; the results are accurate in both the detailed physical quantities and their averages; the resultant solution can be further integrated analytically over the parameters associated with the problem; and the method can be readily applied to nonlinear integral equations.
    Keywords: FLUID MECHANICS
    Type: AIAA Journal; 10; Mar. 197
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  • 9
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    Nonuniform concentration - A mechanism for drag reduction. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A large reduction in drag coefficient has been observed in certain external flows of aqueous solutions with high molecular weight polymer additives. A change in the near wake configuration is phenomenologically responsible for the drag reduction, but the underlying mechanism is presently unknown. An analogy to known phenomena in particulate suspensions is drawn which suggests nonuniform concentration of the polymer additive as an explanation. An analysis of the boundary layer on a sphere with varying viscosity was made to investigate the effect. The results indicate early transition to turbulence for concentration variations whose length scale is small compared with the momentum boundary layer thickness. Stabilization and delayed transition are indicated for thicker concentration layers. Observations are suggested for the thin concentration layers.
    Keywords: FLUID MECHANICS
    Type: Physics of Fluids; 15; May 1972
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  • 10
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    Growth of turbulence in the presence of shear. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: On the basis of calculated results for some simplified models, the mechanism of turbulence growth or maintenance in a shear flow is examined. The study is aimed mainly at determining whether, from a theoretical viewpoint, the effect of a mean shear can be great enough to offset the effects of viscosity and keep a turbulent field from decaying, regardless of whether the turbulence ultimately grows or reaches a steady state. The results obtained suggest that a mean shear can produce a nondecaying turbulence field.
    Keywords: FLUID MECHANICS
    Type: Physics of Fluids; 15; Nov. 197
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