Accession Number:

ADA244320

Title:

Computation of a Kelvin-Helmholtz Instability for Delta Wing Vortex Flows

Descriptive Note:

Final rept. 1 Sep 1990-1 Sep 1991

Corporate Author:

MICRO CRAFT INC TULLAHOMA TN

Personal Author(s):

Report Date:

1991-11-01

Pagination or Media Count:

39.0

Abstract:

The structure of the shear layer which emanates from the leading edge of a 76 degrees sweep delta wing and forms the primary vortex is investigated numerically. The flow conditions are M at infinity 0.2, Re 50,000 and angle of attack of 20.5 degrees. Computational results are obtained using a Beam- Warning type algorithm. The existence of a Kelvin-Helmholtz type instability of the shear layer which emanates from the leading edge of the delta wing is demonstrated. A description is provided of the three-dimensional, unsteady behavior of the small-scale vortices associated with this instability. The numerical results are compared qualitatively with experimental flow visualizations exhibiting similar behavior.

Subject Categories:

  • Aerodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE