Accession Number : ADP006230
Title : Unsteady Separated Flow Phenomena Causing Self-Excited Structural Oscillations,
Corporate Author : LOCKHEED MISSILES AND SPACE CO INC SUNNYVALE CA
Personal Author(s) : Ericsson, L. E.
Report Date : SEP 1990
Pagination or Media Count : 16
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.
Descriptors : *FLOW SEPARATION, UNSTEADY FLOW, INTERACTIONS, BUFFETING, STRUCTURAL RESPONSE, EXCITATION, ANGLE OF ATTACK, HIGH ANGLES, DAMPING, OSCILLATION.
Subject Categories : Aerodynamics
Distribution Statement : APPROVED FOR PUBLIC RELEASE