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  • 1
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    Skin friction and velocity profile family for compressible turbulent boundary layers (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The paper presents a general approach to constructing mean velocity profiles for compressible turbulent boundary layers with isothermal or adiabatic walls. The theory is based on a density-weighted transformation that allows the extension of the incompressible similarity laws of the wall to the compressible regions. The velocity profile family is compared to a range of experimental data, and excellent agreement is obtained. A self-consistent skin friction law, which satisfies the proposed velocity profile family, is derived and compared with the well-known Van Driest II theory for boundary layers in zero pressure gradient. The results are found to be at least as good as those obtained by using the Van Driest II transformation.
    Keywords: AERODYNAMICS
    Type: AIAA Journal (ISSN 0001-1452); 31; 9; p. 1600-1604.
    Format: text
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  • 2
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    Turbulence: The chief outstanding difficulty of our subject (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A review of interesting current topics in turbulence research is decorated with examples of popular fallacies about the behavior of turbulence. Topics include the status of the Law of the Wall, especially in compressible flow; analogies between the effects of Reynolds numbers, pressure gradient, unsteadiness and roughness change; the status of Kolmogorov's universal equilibrium theory and local isotropy of the small eddies; turbulence modelling, with reference to universality, pressure-strain modelling and the dissipation equation; and chaos. Fallacies include the mixing-length concept; the effect of pressure gradient on Reynolds shear stress; the separability of time and space derivatives; models of the dissipation equation; and chaos.
    Keywords: AERODYNAMICS
    Type: California State Univ., The Fifth Symposium on Numerical and Physical Aspects of Aerodynamic Flows; 11 p
    Format: application/pdf
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  • 3
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    The interaction between a strong longitudinal vortex and a turbulent boundary layer (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: This paper presents the preliminary results of a long-term investigation of the interaction of strong longitudinal vortices with turbulent boundary layers. A pair of trailing vortices is generated by a delta wing, which is mounted ahead of a flat plate so that the trailing vortices merge with the boundary layer on the upper surface of the flat plate, while the non-rolled-up part of the delta-wing wake passes below the plate. This approximates an aircraft wing with a close-coupled canard. The measurements show how the boundary-layer fluid is first subjected to large cross flow and is then transported away from the plate to circulate around the vortex core.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 86-1071
    Format: text
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  • 4
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    Vortex/boundary layer interactions (1989)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Detailed and high quality measurements with hot-wires and pressure probes are presented for two different interactions between a vortex pair with common flow down and a turbulent boundary layer. The interactions studied have larger values of the vortex circulation parameter than those studied previously. The results indicate that the boundary layer under the vortex pair is thinned by lateral divergence and that boundary layer fluid is entrained into the vortex. The effect of the interaction on the vortex core (other than the inviscid effect of the image vortices behind the surface) is small.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 89-0083
    Format: text
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  • 5
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    Vortex/boundary-layer interactions: Data report, volume 1 (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This report summarizes the work done under NASA Grant NAGw-581, Vortex/Boundary Layer Interactions. The experimental methods are discussed in detail and numerical results are presented, but are not fully interpreted. This report should be useful to anyone who wishes to make further use of the data (available on floppy disc or magnetic tape) for the development of turbulence models or the validation of predictive methods. Journal papers are in course of preparation.
    Keywords: AERODYNAMICS
    Type: NASA-CR-181462 , NAS 1.26:181462 , IC-AERO-TN-87-102-VOL-1
    Format: application/pdf
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  • 6
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    Vortex/boundary-layer interactions: Data report, volume 2 (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This report summarizes the work done under NASA grant NAGw-581, Vortex/Boundary-Layer Interactions, to date. The experimental methods are discussed in detail and the results presented as a large number of figures, but are not fully interpreted. This report should be useful to anyone who wishes to make further use of the data (available on floppy disc or magnetic tape) for the development of turbulence models or the validation of predictive methods. Journal papers are in preparation.
    Keywords: AERODYNAMICS
    Type: NASA-CR-181463 , NAS 1.26:181463 , IC-AERO-TN-87-102-VOL-2
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  • 7
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    Vortex boundary-layer interactions (1986)
    In:  CASI
    Details
    Publication Date: 2019-07-20
    Description: Parametric studies to identify a vortex generator were completed. Data acquisition in the first chosen configuration, in which a longitudinal vortex pair generated by an isolated delta wing starts to merge with a turbulent boundary layer on a flat plate fairly close to the leading edge is nearly completed. Work on a delta-wing/flat-plate combination, consisting of a flow visualization and hot wire measurements taken with a computer controlled traverse gear and data logging system were completed. Data taking and analysis have continued, and sample results for another cross stream plane are presented. Available data include all mean velocity components, second order mean products of turbulent fluctuations, and third order mean products. Implementation of a faster data logging system was accomplished.
    Keywords: AERODYNAMICS
    Type: NASA-CR-176701 , NAS 1.26:176701
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  • 8
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    A spin-recovery parachute system for light general-aviation airplanes (1980)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A tail mounted spin recovery parachute system was designed and developed by the NASA Langley Research Center for use on light general aviation airplanes. The system was designed for use on typical airplane configurations, including low wing, single engine, and twin-engine design. A mechanically triggered pyrotechnic slug gun is used to forcibly deploy a pilot parachute which extracts a bag that deploys a ring slot spin recovery parachute. The total system weighs 8.2 kg (18 lb). System design factors included airplane wake effects on parachute deployment, prevention of premature parachute deployment, positive parachute jettison, compact size, low weight, system reliability, and pilot and ground crew safety. Extensive ground tests were conducted to qualify the system. The recovery parachute was used successfully in flight 17 times.
    Keywords: AERODYNAMICS
    Type: NASA-TM-80237 , L-13585 , Aerospace Mech. Symp.; May 01, 1980 - May 02, 1980; Hampton, VA; United States
    Format: application/pdf
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  • 9
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    Aerodynamic and deployment characteristics of single-keel solid and single-keel slotted personnel parawings (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Performance and characteristics of single keel personnel parawings
    Keywords: AERODYNAMICS
    Type: NASA-TN-D-5911 , L-6590
    Format: application/pdf
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  • 10
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    Strong vortex/boundary layer interactions. II - Vortices low (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: This is the second of two papers on the interaction between a longitudinal vortex pair, produced by a delta-wing at angle of attack, and a turbulent boundary layer developing on a flat plate. In the first paper only the outer parts of the vortices entered the boundary layer whereas in this paper the vortices merge with it. In the resultant interaction, the boundary layer between the vortices is kept thin by lateral divergence and a three-dimensional separation line is formed outboard of each vortex. Turbulent, momentum-deficient fluid containing longitudinal vorticity is entrained from the boundary layer along these lines and wrapped around the vortices. As a consequence, the turbulent region of the vortices increases in size and the circulation slowly decreases. It is shown that the flow near the separation line and in the vortices is complicated, and this interaction is expected to be more difficult to calculate than the first. Detailed mean flow and turbulence measurements are reported.
    Keywords: AERODYNAMICS
    Type: Experiments in Fluids (ISSN 0723-4864); 14; 6; p. 393-401.
    Format: text
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