Accession Number:

ADP006230

Title:

Unsteady Separated Flow Phenomena Causing Self-Excited Structural Oscillations,

Descriptive Note:

Corporate Author:

LOCKHEED MISSILES AND SPACE CO INC SUNNYVALE CA

Personal Author(s):

Report Date:

1990-09-01

Pagination or Media Count:

16.0

Abstract:

Because of steadily increasing performance demands, both aircraft and missiles operate at high angles of attack where separated flow often has a dominant influence on, especially, the unsteady aerodynamics. The penetration of the buffet boundary usually changes the structural response from the buffet-type to the self-excited type. This transfer occurs when the structural response starts interacting with the unsteady flow separation, generating negative aerodynamic damping. Separated flow aerodynamics are usually very nonlinear, and the self-excited response frequently takes the form of a limit-cycle oscillation.

Subject Categories:

  • Aerodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE