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PHASE DRIFT CHARACTERISTICS OF SELF-EXCITED, COMBUSTION-DRIVEN OSCILLATIONS

Authors
Journal
Journal of Sound and Vibration
0022-460X
Publisher
Elsevier
Publication Date
Volume
242
Issue
5
Identifiers
DOI: 10.1006/jsvi.2000.3395

Abstract

Abstract This paper describes an experimental characterization of the phase drift characteristics of the oscillating pressure in an unstable combustor. It is shown that the phase continuously drifts in a predominantly irregular manner and, given enough cycles, substantially drifts from its “initial” value. It is also shown that the mean-squared value of the phase drift monotonically increases with the number of cycles, a result that is consistent with the predictions of a random walk model. It is concluded that these phase drift characteristics are primarily caused by random processes (i.e., noise) and, thus, do not reflect the underlying low-dimensional dynamics of the instability.

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