Accession Number:

ADA285063

Title:

Asymmetric Vortical Flows Over Slender Bodies with Appendages

Descriptive Note:

Final rept.

Corporate Author:

ILLINOIS INST OF TECH CHICAGO FLUID DYNAMICS RESEARCH CENTER

Report Date:

1994-06-30

Pagination or Media Count:

260.0

Abstract:

In part one of this study, the interaction between vortices forming at the tip of a missile model, and a single fin located down the axis of the model was investigated experimentally for a range of axial fin position azimuthal fin positions and Reynolds number for two angles of attack. Symmetric, attached vortices formed over the model for the first angle of attack, while the vortex system was asymmetric for the second. The interaction was documented using flow visualization and mean-pressure measurements on the fin surfaces. The pressure data were used to compute the normal-force efficients on the fin. The effects of the interaction on the fin are described. Results include a detailed examination of the fin interaction with the symmetric and asymmetric vortex systems, the azimuthal range of fin positions over which interaction occurs, and the effects interaction on the fin are described. Results include a detailed examination of the fin interaction with the symmetric and asymmetric vortex systems, the azimuthal range of fin positions over which interaction occurs, and the effects of changing axial fin location and Reynolds number. In the second part, the vortical flow over a steady missile configuration with a tangent-ogive forebody was investigated for different angles of attack. The model was designed in a such a way to allow the tip and the aft body to be stationary and the body to roll. This enabled measurement of the pressure over the model surface without disturbing the flow field. The angle of attack and Reynolds number were varied from 0 degrees to 85 degrees and from 6000 to 34000, respectively. Flow visualization and pressure distributions acquired at several azimuthal angles were used to describe the flow regions and the onset of asymmetry.

Subject Categories:

  • Guided Missile Dynamics, Configurations and Control Surfaces
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE