Accession Number:

ADA224139

Title:

Effects of Flowfield Turbulence on Asymmetric Vortices over a Slender Body

Descriptive Note:

Master's thesis

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s):

Report Date:

1989-12-01

Pagination or Media Count:

103.0

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.

Subject Categories:

  • Guided Missile Trajectories, Accuracy and Ballistics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE