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  • Other Sources  (1,275)
  • FLUID MECHANICS AND HEAT TRANSFER  (731)
  • AERODYNAMICS  (544)
  • 2015-2019
  • 1990-1994  (1,275)
  • 1950-1954
  • 1993  (1,275)
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  • Other Sources  (1,275)
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  • 2015-2019
  • 1990-1994  (1,275)
  • 1950-1954
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  • 1
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    Flow and acoustic field due to an inclined plate with a downstream splitter (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: In the present work, the high Reynolds number flow past an inclined plate with a splitter plate placed in its wake is considered numerically. A numerical conformal mapping technique is employed to transform the two-plate system into the same number of cylinders: the flow field is assumed to be two-dimensional. The vortex shedding from the inclined plate is modelled using the discrete vortex method. It is shown that the splitter plate has a profound effect on the development of the flow over a range of values of a suitably defined offset parameter and for a range of positions of the leading edge of the splitter plate. The acoustic field is also calculated and the spectrum reflects the flow results.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Journal of Sound and Vibration (ISSN 0022-460X); 166; 2; p. 209-235
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    The use of hypersonic waveriders for aero-assisted orbital manoeuvring (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The benefits of using a hypersonic waverider for spacecraft trajectory modification are presented. A waverider is a hypersonic vehicle specifically designed so that the undersurface bow shock is attached to the leading edge, which provides for the highest known lift-to-drag ratios achievable at high Mach number flight. Several viable space missions are suggested which could use such configurations for low-drag aero-assisted maneuvers in planetary atmospheres. It is shown that large changes in the spacecraft velocity vector can be accomplished with acceptably small losses in energy due to drag using a waverider aeroshell. The primary advantage of an aero-assist maneuver is suggested by comparison to a traditional gravity-assist trajectory. Some scaling laws are presented for comparing waveriders designed for different planetary atmospheres, and it is shown that the compositional differences between the terrestrial planets has a minimal impact on waverider design.
    Keywords: AERODYNAMICS
    Type: British Interplanetary Society, Journal (ISSN 0007-094X); 46; 1; p. 11-20
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    NASA TECHNICAL REPORTS
  • 3
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    Equidistribution of energy and other quantities in oscillating systems (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Energy of a high harmonic standing wave tends to be distributed equally over the whole wave even in a stratified medium where the wave's peak amplitude can be much larger near the upper boundary than the lower one. This fact is generalized to the many diverse physical problems which solve second-order differential equations of Sturm-Liouville type. For any such solution y(z) whose sign fluctuates along the z-axis, quantities are found which have the same value between any two neighboring zeros of y. One of the equidistributed quantities for an oscillating fluid sphere is similar to kinetic energy but is identical only in limiting cases. The acoustic midpoint of a cavity can be a unique place where some nonlinear perturbations have extra strength. This may apply to the puzzling solar phenomenon called supergranulation.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 414; 2; p. 892-897.
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    NASA TECHNICAL REPORTS
  • 4
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    Low aspect ratio wing code validation experiment (1993)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Keywords: AERODYNAMICS
    Type: AIAA Journal (ISSN 0001-1452); 31; 10; p. 1744-1752.
    Format: text
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  • 5
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    Transonic Navier-Stokes flow computations over wing-fuselage geometries (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Keywords: AERODYNAMICS
    Type: Journal of Aircraft (ISSN 0021-8669); 30; 5; p. 791-793. Abridged
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  • 6
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    Investigation of vortex development on a pitching slender body of revolution (1993)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Keywords: AERODYNAMICS
    Type: Journal of Aircraft (ISSN 0021-8669); 30; 5; p. 711-718.
    Format: text
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  • 7
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    Unsteady aerodynamic behavior of an airfoil with and without a slat (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Unsteady flow behavior and load characteristics of a 2D VR-7 airfoil with and without a leading-edge slat were studied in the water tunnel of the Aeroflightdynamics Directorate, NASA Ames Research Center. Both airfoils were oscillated sinusoidally between 5 and 25 deg at Re = 200,000 to obtain the unsteady lift, drag, and pitching moment data. A fluorescent dye was released from an orifice located at the leading edge of the airfoil for the purpose of visualizing the boundary layer and wake flow. The flowfield and load predictions of an incompressible Navier-Stokes code based on a velocity-vorticity formulation were compared with the test data. The test and predictions both confirm that the slatted VR-7 airfoil delays both static and dynamic stall as compared to the VR-7 airfoil alone.
    Keywords: AERODYNAMICS
    Type: Computers & Fluids (ISSN 0045-7930); 22; 4-5; p. 529-547.
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    NASA TECHNICAL REPORTS
  • 8
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    Navier-Stokes calculations for vortex rings in an unbounded domain (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A computational code for the vorticity-potential method is developed for a three-dimensional bounded vorticity field. The evaluation of the boundary data for the vector potential in the code is improved so that the numerical solution simulates that in an unbounded domain to a high order. The time evolution of two vortex rings and that of an elliptic ring are investigated with this code. The cut-and-connect phenomena of vortex rings are successfully captured. The results are compared with those of asymptotic theory and the experiment. They also highlight the need for additional theoretical and numerical investigations.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Computers & Fluids (ISSN 0045-7930); 22; 4-5; p. 589-605.
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  • 9
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    A finite-volume Euler solver for computing rotary-wing aerodynamics on unstructured meshes (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Keywords: AERODYNAMICS
    Type: American Helicopter Society, Journal (ISSN 0002-8711); 38; 2; p. 61-67.
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  • 10
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    Direct periodic solutions of rotor free wake calculations (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Keywords: AERODYNAMICS
    Type: American Helicopter Society, Journal (ISSN 0002-8711); 38; 2; p. 53-60.
    Format: text
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