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  • FLUID MECHANICS AND HEAT TRANSFER  (83)
  • 1975-1979  (83)
  • 1978  (83)
  • 1
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    Radiative flux penetration through a blown shock layer for Jupiter entry conditions (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A study is made of the radiative blockage due to carbonaceous ablation injection for a probe entering the Jupiter atmosphere. This is accomplished by calculating the stagnation-point blockage factors for three entry trajectories that account for variations in probe configuration, atmospheric gas composition, and entry conditions. The radiative blockage within the relatively cool ablation layer is shown to be large and to be primarily dependent upon the absorption of the C2 and C3 species. The C3 absorption is significant, particularly when the new experimental data for C3 spectral absorption properties are used. Also, the stagnation-point radiative blockage factors are shown to correlate well in terms of the no-injection radiative heating rates for various entry conditions.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 78-908 , Thermophysics and Heat Transfer Conference; May 24, 1978 - May 26, 1978; Palo Alto, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Analysis of strong-interaction dynamic stall for laminar flow on airfoils (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A compressible Navier-Stokes solution procedure is applied to the flow about an isolated airfoil. Two major problem areas were investigated. The first area is that of developing a coordinate system and an initial step in this direction has been taken. An airfoil coordinate system obtained from specification of discrete data points developed and the heat conduction equation has been solved in this system. Efforts required to allow the Navier-Stokes equations to be solved in this system are discussed. The second problem area is that of obtaining flow field solutions. Solutions for the flow about a circular cylinder and an isolated airfoil are presented. In the former case, the prediction is shown to be in good agreement with data.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-2969 , R77-912030-17
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Method for calculating convective heat-transfer coefficients over turbine vane surfaces (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A method for calculating laminar, transitional, and turbulent convective heat-transfer coefficients for turbine vane surfaces is described. An approximate integral solution method produced results in good agreement with a finite-difference solution. Comparisons between the two are presented. The integral solution results agreed well with the finite-difference solution results in the laminar and turbulent regions. Differences in calculating the start of transition produced a later starting point for the approximate integral solution's transitional flow regime.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TP-1134 , E-9324
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Cryogenic-coolant He-4-superconductor interaction (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The thermodynamic and thermal interaction between a type 2 composite alloy and cryo-coolant He4 was studied with emphasis on post quench phenomena of formvar coated conductors. The latter were investigated using a heater simulation technique. Overall heat transfer coefficients were evaluated for the quench onset point. Heat flux densities were determined for phenomena of thermal switching between a peak and a recovery value. The study covered near saturated liquid, pressurized He4, both above and below the lambda transition, and above and below the thermodynamic critical pressure. In addition, friction coefficients for relative motion between formvar insulated conductors were determined.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-2963 , UCLA-ENG-7767
    Format: application/pdf
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  • 5
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    Application of second-order turbulent modeling to the prediction of radiated aerodynamic sound (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The Ribner formulation of the generation of aerodynamic sound is coupled with predictions of second-order velocity correlations and integral scale to estimate the sound radiated from several complicated jet flows. In particular, it is shown that the sound radiated from a cold swirling jet is greater than from its nonswirling equal thrust counterpart. The noise radiated from the flow field of a multitube suppressor was estimated and compared with an equal thrust diameter Gaussian jet. It is shown that the multitube concept is indeed quieter.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-2994
    Format: application/pdf
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  • 6
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    Performance characteristics of two annular dump diffusers using suction-stabilized vortex flow control (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The two diffusers employed in the investigation had the same overall area ratio but different prediffuser area ratios and suction slot geometries. Velocity profile and diffuser pressure recovery performance data were obtained at ambient pressure and temperature, with inlet Mach numbers ranging from 0.18 to 0.41 and suction rate varying from zero to 18% of total inlet mass flow rate. On the basis of the reported investigation it is concluded that suction stabilized vortex flow diffusers show promise for application in combustors because of relatively high static pressure recovery and low total pressure loss obtained in a short length. Performance obtained using a narrow angle (7 degree) prediffuser was superior to that obtained with a prediffuser having a 14 degree included angle.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Joint Symposium on Design and Operation of Fluid Machinery; Jun 12, 1978 - Jun 14, 1978; Fort Collins, CO; US
    Format: text
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  • 7
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    Performance investigations of liquid-metal heat pipes for space and terrestrial applications (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The high heat transfer capacity of liquid-metal heat pipes is demonstrated in performance tests with mercury, potassium, sodium, and lithium working fluids and wick structures which serve to minimize liquid pressure losses and vapor/liquid interactions. Appropriate wicks for horizontal and vertical operation are described. It is shown that heat-transfer with these wicks is limited by vapor flow effects. Examples are given of particular effects associated with a long adiabatic section between evaporator and condenser and with a heat source of uniform temperature as opposed to a source of uniform power.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: CONF-780531-3 , LA-UR-78-547 , AIAA PAPER 78-431 , International Heat Pipe Conference; May 22, 1978 - May 24, 1978; Palo Alto, CA
    Format: text
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  • 8
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    Uniform distortion of a heated turbulent wake (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Digital sampling and processing techniques are used to assess the effect of a uniform and constant strain rate on a slightly heated cylinder-generated wake which had undergone a prestrain development distance of 115 cylinder diameters. The wake is generated by a circular heating element (6.6-mm-diam cylinder) mounted horizontally in the center of a low-speed open return wind tunnel. The strain field is produced by a distortion duct oriented in such a way as to accentuate any periodic interface structure which might be present in the undistorted wake. Interface statistics are presented for both the undistorted (near) wake and the uniformly strained wake, and conditional (point) averages of the streamwise velocity and passive temperature fields of the strained wake. The results suggest that the interface thickness is fairly uniform along the back but decreases along the front with distance from the wake center.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: In: Structure and mechanisms of turbulence II; Proceedings of the Symposium on Turbulence; Aug 01, 1977 - Aug 05, 1977; Berlin
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  • 9
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    Application of a two-dimensional parabolic computer program to prediction of turbulent reacting flows (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The capabilities of a computer program are explored, and computed results are compared with data. The comparisons are restricted to two-dimensional flows. Subsonic and supersonic flows, ducted and nonducted, reacting and nonreacting, are considered. An evaluation of models used for turbulence and chemical reaction was included. Constants in the dissipation rate of turbulent kinetic energy, turbulence model, which produces mixing in good agreement with data, are the same for all calculations. Experimental data are reported for coaxial injection at matched pressure (1 atm or 101.3 kPa) of a cold, Mach 2, hydrogen jet into a hot, Mach 2, vitiated airstream. Profiles of pitot pressure and gas composition obtained from water cooled probes are reported and compared with theoretical results.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TP-1169
    Format: application/pdf
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  • 10
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    Dynamic stall: An example of strong interaction between viscous and inviscid flows (1978)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A study was done of the phenomena concerning profiles in dynamic stall configuration, and more specially those related to pitch oscillations. The most characteristic experimental results on flow separations with a vortex character, and their repercussions on local pressures and total forces were analyzed. Some aspects of the methods for predicting flows with the presence (or not) of boundary layer separation are examined, as well as the main simplified methods available to date for the calculation of total forces in such configurations.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-75447 , ONERA-TP-1977-135 , Symp. on Unsteady Aerodyn.; Sep 26, 1977 - Sep 28, 1977; Ottawa
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