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  • FLUID MECHANICS AND HEAT TRANSFER  (63)
  • 1980-1984  (63)
  • 1984  (63)
  • 1
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    Turbulence characteristics of an axisymmetric reacting flow (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Turbulent sudden expansion flows are of significant theoretical and practical importance. Such flows have been the subject of extensive analytical and experimental study for decades, but many issues are still unresolved. Detailed information on reacting sudden expansion flows is very limited, since suitable measurement techniques have only been available in recent years. The present study of reacting flow in an axisymmetric sudden expansion was initiated under NASA support in December 1983. It is an extension of a reacting flow program which has been carried out with Air Force support under Contract F33615-81-K-2003. Since the present effort has just begun, results are not yet available. Therefore a brief overview of results from the Air Force program will be presented to indicate the basis for the work to be carried out.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA. Lewis Research Center Combust. Fundamentals Res.; p 189-198
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  • 2
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    Measurements of heat transfer distribution over the surfaces of highly loaded turbine nozzle guide vanes (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: ASME, Transactions, Journal of Engineering for Gas Turbines and Power (ISSN 0022-0825); 106; 149-158
    Format: text
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  • 3
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    Cascade variable-conductance heat pipe (A0076) (1984)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: The objective is to verify the capability of a cascade variable conductance heat pipe (CVCHP) system to provide precise temperature control of long life spacecraft without the need for a feedback heater or other power sources for temperature adjustment under conditions of widely varying power input and ambient environment. Solar energy is the heat source and space the heat sink for thermally loading two series connected variable conductance heat pipes. Electronics and power supply equipment requirements are minimal. A 7.5 V lithium battery supplies the power for thermistor type temperature sensors for monitoring system performance, and a 28 V lithium battery supplies power for valve actuation.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA. Langley Research Center Long Duration Exposure Facility (LDEF); p 66-69
    Format: text
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  • 4
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    Wall mass transfer and pressure gradient effects on turbulent skin friction (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The effects of mass injection and pressure gradients on the drag of surfaces were studied theoretically with the aid of boundary-layer and Navier-Stokes codes. The present investigation is concerned with the effects of spatially varying the injection in the case of flat-plate drag. Effects of suction and injection on wavy wall surfaces are also explored. Calculations were performed for 1.2 m long surfaces, one flat and the other sinusoidal with a wavelength of 30.5 cm. Attention is given to the study of the effect of various spatial blowing variations on flat-plate skin friction reduction, local skin friction coefficient calculated by finite difference boundary-layer code and Navier-Stokes code, and the effect of phase-shifting sinusoidal mass transfer on the drag of a sinusoidal surface.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA Journal (ISSN 0001-1452); 22; 143-145
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  • 5
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    Numerical algorithm conjugating steady and transient, separated, compressible flow and a solid body having arbitrarily distributed heat sources (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A numerical algorithm that is second-order accurate in time has been developed for the conjugated problem of a separated, compressible flow field and a conductive solid body. The full two-dimensional time-dependent Navier-Stokes equations are coupled with the time-dependent energy equation for the solid body and are solved simultaneously. using implicit algorithms. The energy equation for the solid body may include arbitrarily distributed heat sources. The algorithm has been exmined for the case of two-dimensional supersonic compression-corner interaction, with a heat source embedded in the wall in the vicinity of the separation bubble and the attached boundary layer. The effect of the heat source on the flow field is studied for steady and transient cases.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Numerical Heat Transfer (ISSN 0149-5720); 7; 395-411
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  • 6
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    A unified relation for cavitation erosion (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A power-law relationship between the average erosion rate and cumulative erosion is presented. Data analyses from Venturi, magnetostriction, and liquid-impingement devices conform to this unified relation. A normalization technique is also suggested for prediction purposes.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: International Journal of Mechanical Sciences (ISSN 0020-7403); 26; 5, 19
    Format: text
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  • 7
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    Recent developments in multigrid methods for the steady Euler equations (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The solution by multigrid techniques of the steady inviscid compressible equations of gas dynamics, the Euler equations is investigated. Steady two dimensional transonic flow over an airfoil section is studied intensively. Most of the material is applicable to three dimensional flow problems of aerodynamic interest.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Von Karman Inst. for Fluid Dynamics Computational Fluid Dyn., Vol. 2; 71 p
    Format: text
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  • 8
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    Experiments in dilution jet mixing (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA Journal (ISSN 0001-1452); 22; 1436-144
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  • 9
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    Modeling of dilution jet flowfields (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The present paper will compare temperature field measurements from selected cases in these investigations with distributions calculated with an empirical model based on assumed vertical profile similarity and superposition and with a 3-D elliptic code using a standard K-E turbulence model. The results will show the capability (or lack thereof) of the models to predict the effects of the principle flow and geometric variables.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Combust. Fundamentals Res.; p 175-187
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  • 10
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    Shear layer excitation, experiment versus theory (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The acoustical excitation of shear layers is investigated. Acoustical excitation causes the so-called orderly structures in shear layers and jets. Also, the deviations in the spreading rate between different shear layer experiments are due to the same excitation mechanism. Measurements in the linear interaction region close to the edge from which the shear layer is shed are examined. Two sets of experiments (Houston 1981 and Berlin 1983/84) are discussed. The measurements were carried out with shear layers in air using hot wire anemometers and microphones. The agreement between these measurements and the theory is good. Even details of the fluctuating flow field correspond to theoretical predictions, such as the local occurrence of negative phase speeds.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-176604 , NAS 1.26:176604 , DFVLR-FB-84-26
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