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  • Other Sources  (1,113)
  • FLUID MECHANICS AND HEAT TRANSFER  (1,113)
  • 2020-2022
  • 1975-1979  (1,113)
  • 1
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    First results of a study on turbulent boundary layers in oscillating flow with a mean adverse pressure gradient (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The development of a turbulent unsteady boundary layer with a mean pressure gradient strong enough to induce separation, in order to complete the extend results obtained for the flat plate configuration is presented. The longitudinal component of the velocity is measured using constant temperature hot wire anemometer. The region where negative velocities exist is investigated with a laser Doppler velocimeter system with BRAGG cells. The boundary layer responds by forced pulsation to the perturbation of potential flow. The unsteady effects observed are very important. The average location of the zero skin friction point moves periodically at the perturbation frequency. Average velocity profiles from different instants in the cycle are compared. The existence of a logarithmic region enables a simple calculation of the maximum phase shift of the velocity in the boundary layer. An attempt of calculation by an integral method of boundary layer development is presented, up to the point where reverse flow starts appearing.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-75799 , Colloq. d''Aerodyn. Appl.; Nov 07, 1978 - Nov 09, 1978; Marseille
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  • 2
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    Studies on the influence on flexural wall deformations on the development of the flow boundary layer (1978)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Flexural wave-like deformations can be used to excite boundary layer waves which in turn lead to the onset of turbulence in the boundary layer. The investigations were performed with flow velocities between 5 m/s and 40 m/s. With four different flexural wave transmissions a frequency range from 0.2 kc/s to 1.5 kc/s and a phase velocity range from 3.5 m/s to 12 m/s was covered. The excitation of boundary layer waves becomes most effective if the phase velocity of the flexural wave coincides with the phase velocity region of unstable boundary layer waves.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-75220
    Format: application/pdf
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  • 3
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    Experimental study of the laminar-turbulent transition of a concave wall in a parallel flow (1978)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The instability of the laminar boundary layer flow along a concave wall was studied. Observations of these three-dimensional boundary layer phenomena were made using the hydrogen-bubble visualization technique. With the application of stereo-photogrammetric methods in the air-water system it was possible to investigate the flow processes qualitatively and quantitatively. In the case of a concave wall of sufficient curvature, a primary instability occurs first in the form of Goertler vortices with wave lengths depending upon the boundary layer thickness and the wall curvature. At the onset the amplification rate is in agreement with the linear theory. Later, during the non-linear amplification stage, periodic spanwise vorticity concentrations develop in the low velocity region between the longitudinal vortices. Then a meandering motion of the longitudinal vortex streets subsequently ensues, leading to turbulence.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-75243
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  • 4
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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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  • 5
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    Heat pipes and their use in technology (1977)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Heat pipes may be employed as temperature regulators, heat diodes, transformers, storage batteries, or utilized for transforming thermal energy into mechanical, electric, or other forms of energy. General concepts were established for the analysis of the transfer process in heat pipes. A system of equations was developed to describe the thermodynamics of steam passage through a cross section of a heat pipe.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-75148
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  • 6
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    Nonlinear Fourier algorithm applied to solving equations of gravitational gas dynamics (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Two dimensional gas flow problems were reduced to an approximating system of common differential equations, which were solved by a standard procedure of the Runge-Kutta type. A theorem of the existence of stationary conical shock waves with the cone vertex in the gravitating center was proved.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-75627 , PR-423
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  • 7
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    Thermal analysis of turbulent flow of a supercritical fluid (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The influence of the large variation of thermodynamics and transport properties near the pseudocritical temperature on the heat transfer coefficient of supercritical fluid in turbulent flow was studied. The formation of the characteristics peak in the heat transfer coefficient vs. bulk temperature curve is described, and the necessity of the fluid element at pseudocritical temperature located in the buffer layer is discussed.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-75406 , COBEM 75: The 3d Brazilian Congr. on Mech. Eng.; Dec 09, 1975 - Dec 11, 1975; Rio de Janeiro; Brazil
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  • 8
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    Parallel computation of unsteady, three-dimensional, chemically reacting, nonequilibrium flow using a time-split finite-volume method on the Illiac IV (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: A description is presented of the split finite-volume method which is a viable numerical procedure for performing with the aid of a modern special purpose vector computer numerical simulation studies of complicated flow fields, including chemical reactions, about geometrically complex bodies. Such numerical studies are needed for the development of atmospheric entry vehicles such as the space shuttle. The equations which are approximated are quite general and can be used in studies of combustion, pollution, and other chemically reacting flow phenomena, where convective transport effects dominate the influence of radiative, viscous, and other transport mechanisms. The shock perturbed flow about a shuttle orbiter flying at a large angle of attack during atmospheric entry is illustrated. The method uses a time splitting of the convection differencing operator to achieve efficient data management.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Format: text
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  • 9
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    Integral method for the calculation of three-dimensional, laminar and turbulent boundary layers (1978)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The method for turbulent flows is a further development of an existing method; profile families with two parameters and a lag entrainment method replace the simple entrainment method and power profiles with one parameter. The method for laminar flows is a new development. Moment of momentum equations were used for the solution of the problem, the profile families were derived from similar solutions of boundary layer equations. Laminar and turbulent flows at the wings were calculated. The influence of wing tapering on the boundary layer development was shown. The turbulent boundary layer for a revolution ellipsoid is calculated for 0 deg and 10 deg incidence angles.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-75320
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  • 10
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    Flow of viscous gas in the region of a slot with strong suction (1978)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The flow of a perfect viscous gas was studied in the region of a slot with strong suction. Velocity and temperature distribution fields are computed of the case of thermally insulated and heat conducting surfaces. The dependence of the flow characteristics on the suction gas discharge is obtained for a single slot with strong suction.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-75241
    Format: application/pdf
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