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  • Fluid Mechanics and Thermodynamics
  • 1960-1964  (53)
  • 1950-1954  (30)
  • 1
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    Experimental Observations of Aerodynamic and Heating Test on Insulating Heat Shields (1962)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Several different types of insulating heat shields have been subjected to aerodynamic tests and radiant-heating tests in order to obtain a better insight into the problems involved when the primary structure of m aerodynamically heated vehicle is substantially cooler than the exposed external surface. One of the main problems was considered to be a proper allowance for thermal expansion caused by these large temperature differences, so that undue distortion or thermal stresses would not occur in either the outer shield or the underlying structure. corrugated outer skin with suitably designed expansion joints was a feature of all the specimens tested.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NASA-TN-D-1237
    Format: application/pdf
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  • 2
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    Propulsion and Power Generation (1963)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: No abstract available
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NASA-TM-X-50121
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  • 3
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    Existence of Solutions of One-Dimensional Flow of a Real Gas (1961)
    In:  CASI
    Details
    Publication Date: 2019-08-26
    Description: Formal solutions to the equations of motion of the one-dimensional, unsteady flow of a viscous, compressible, heat-conducting gas are presented. The relationship between the existence of these solutions and the problem of hydrodynamic stability is discussed.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: The Physics of Fluids; 4; 3; 360-361
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  • 4
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    Boundary Layer Effect on the Surface Pressure of an Infinite Cone in Supersonic Flow (1951)
    In:  CASI
    Details
    Publication Date: 2019-08-26
    Description: The theory of Taylor and Maccoll (Ref,1) gives the surface pressure on an infinite cone in supersonic flow as a function of the cone vertex angle and the free stream Mach number and static pressure for a gas of vanishing viscosity. When a slender conical probe is used together with an impact pressure probe to determine the static pressure and Mach number in a low density gas stream, it is desirable to have some theoretical estimate of the effect of viscous boundary layer on the probe readings. Theoretical and experimental results with respect to impact probes have been presented in Refs. 5 and 6. A simple approximation for a conical probe based on linearized supersonic flow and compressible boundary layer theory is presented here.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: HE-150-80
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  • 5
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    Ballistic Range Measurements of Stagnation-Point Heat Transfer in Air and in Carbon Dioxide at Velocities up to 18,000 Feet Per Second (1961)
    In:  CASI
    Details
    Publication Date: 2019-08-17
    Description: A new technique for measuring heat-transfer rates on free-flight models in a ballistic range is described in this report. The accuracy of the heat-transfer rates measured in this way is shown to be comparable with the accuracy obtained in shock-tube measurements. The specific results of the present experiments consist of measurements of the stagnation-point heat-transfer rates experienced by a spherical-nosed model during flight through air and through carbon dioxide at velocities up to 18,000 feet per second. For flight through air these measured heat-transfer rates agree well with both the theoretically predicted rates and the rates measured in shock tubes. the heat-transfer rates agree well with the rates measured in a shock tube. Two methods of estimating the stagnation-point heat-transfer rates in carbon dioxide are compared with the experimental measurements. At each velocity the measured stagnation-point heat-transfer rate in carbon dioxide is about the same as the measured heat-transfer rate in air.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NASA-TN-D-777 , A-427
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  • 6
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    Experimental Investigation of the Natural Frequencies of Liquids in Toroidal Tanks (1960)
    In:  CASI
    Details
    Publication Date: 2019-08-17
    Description: Several toroidal configurations applicable to missile and space-vehicle liquid storage systems were oscillated to study the natural frequencies of the antisymmetric modes of contained liquids over a range of liquid depths and tank sizes. Natural frequencies for tank oscillations parallel to the free surface of both vertical and horizontal tank orientations. Natural frequencies were obtained. The data are presented in terms of dimensionless parameters which are obtained by relating experimentally determined natural liquid frequencies to analytical expressions developed through consideration of the physics of the problem and from existing solutions for liquids in tanks having similar boundaries at the liquid surface. The experimental results obtained for the toroids indicate that these parameters are applicable to the prediction of the natural frequencies of fluids in toroids of general geometry and size.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NASA-TN-D-531 , L-1069
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  • 7
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    Experimental Investigation of a High-Speed Hydrofoil with Parabolic Thickness Distribution and an Aspect Ratio of 3 (1961)
    In:  CASI
    Details
    Publication Date: 2019-08-17
    Description: An experimental investigation has been made to determine the hydro-dynamic characteristics of a 10-percent-thick hydrofoil with an aspect ratio of 3 designed to operate with acceptable efficiency at speeds in the neighborhood of 100 knots (169 fps). A cambered hydrofoil model with parabolic thickness distribution was investigated at a depth of chord over a range of angles of attack from -0.5 deg to 4.0 deg and at speeds from 120 to 210 fps. substantially wider range of operation at acceptable lift-drag ratios as well as higher maximum lift-drag-ratio values than did a hydrofoil of similar design with an aspect ratio of 1.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NASA-TN-D-728 , L-1358
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  • 8
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    A Visual Technique for Determining Qualitative Aerodynamic Heating Rates on Complex Configurations (1960)
    In:  CASI
    Details
    Publication Date: 2019-08-17
    Description: An experimental investigation was conducted at a test-section Mach number of 4.95 and a stagnation temperature of 400 F to evaluate a visual technique for obtaining qualitative aerodynamic heat-transfer data on complex configurations.This technique utilized a temperature-sensetive paint indicated that this technique was satisfactory for determining qualitative heat-transfer rates on various bodies, some of which exhibited complex flow patterns. The results obtained have been found useful to guide the instrumentation of quantitative heat-transfer models, to supplement quantitative heat-transfer measurements, and to make preliminary heat-transfer studies for new configurations.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NASA-TN-D-385 , L-662
    Format: text
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  • 9
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    A Radiant Heater to Simulate Aerodynamic Heating in a Wind Tunnel (1960)
    In:  CASI
    Details
    Publication Date: 2019-08-16
    Description: A recently developed radiant-heating test technique for simulation of aerodynamic heating in wind tunnel is describes. The heating device, which utilized quartz-tube lamps, was operated successfully while exposed directly to a supersonic airstream. Tests were made on a calibration panel, and experimental temperature and pressure data are presented. Results indicate that initial heating rates of about 26 Btu/(sq ft) (sec) are obtainable at a distance of 12 inches from the heater. Further applications of the basic design are discussed briefly.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NASA/TN-D-530 , L-917
    Format: text
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  • 10
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    A Study of Laminar Compressible Viscous Pipe Flow Accelerated by an Axial Body Force, with Application to Magnetogasdynamics (1961)
    In:  CASI
    Details
    Publication Date: 2019-08-16
    Description: A study is made of the steady laminar flow of a compressible viscous fluid in a circular pipe when the fluid is accelerated by an axial body force. The application of the theory to the magnetofluidmechanics of an electrically conducting gas accelerated by electric and magnetic fields is discussed. Constant viscosity, thermal conductivity, and electrical conductivity are assumed. Fully developed flow velocity and temperature profiles are shown, and detailed results of the accelerating flow development, including velocity and pressure as functions of distance, are given for the case where the axial body force is constant and for the case where it is a linear function of velocity. From these results are determined the pipe entry length and the pressure difference required.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NASA-TN-D-855 , A-396
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