Seminar Series - 1996-1997
Dynamics of Resonant Surge/Stall Interactions in Compressor Models
Dr. Brianno Coller
California Institute of Technology
Sponsored by the Department of Engineering Mechanics
Date: Tuesday, November 12, 1996
Time: 3:30 p.m.
Place: 306 Bancroft Hall
In axial flow compressors there are two primary modes of instability:
axisymmetric flow oscillations (surge), and asymmetric traveling wave disturbances
(rotating stall). Since the occurrence of either during normal operation
of jet aircraft engines could likely lead to catastrophic consequences,
aeroengines are typically over-designed to obviate such possibilities.
Recent efforts, via active control, to suppress the instabilities and
allow for more efficient designs closer to the stall/surge boundary have
achieved only modest success. Difficulties arise when both modes are nearly
critical, leading to complex interactions between the two types of behavior.
In this talk, I present some work in progress on understanding these interactions.
In the analysis, we uncover a (quasi-) global resonant structure that can
be exploited for control purposes. New challenges concerning the practical
application of dynamical systems techniques to engineering systems emerge
as well.
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