Effects of Flowfield Turbulence on Asymmetric Vortices over a Slender Body
Abstract
The flowfield about a vertically-launched surface-to-air missile model at an angle of attack of 50 degrees and a Reynolds number 110000 was investigated in a low-speed wind tunnel at the Naval Postgraduate School. The location and intensity of the asymmetric vortices in the wake of the missile model were determined and the vortices were displayed using planar velocity vector, total pressure coefficient, and vorticity plots. The model configuration tested was a body-only configuration (wings, strakes, and tails removed). Two flowfield conditions were treated: the nominal ambient wind tunnel condition and grid-generated turbulence condition. Flow visualization was conducted and video- taped for both the body-only and winged configurations. The following conclusions were reached: (1) the addition of turbulence decreased the vorticity but did not significantly change the patterns of the plots; (2) the addition of turbulence reduced the vorticity more at eleven body diameters than at six diameters; (3) compared to the body-only case, the vorticity is reduced for the 'x' case but not for the '+' case for the turbulence condition; (4) flow visualization verified vortices movement away from the missiles as the tested point was moved aft along the missile body. Theses.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1989
- Accession Number
- ADA224139
Entities
People
- James A. Pinaire Jr.
Organizations
- Naval Postgraduate School