PHASE DRIFT CHARACTERISTICS OF SELF-EXCITED, COMBUSTION-DRIVEN OSCILLATIONS
✍ Scribed by T.C. LIEUWEN
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 436 KB
- Volume
- 242
- Category
- Article
- ISSN
- 0022-460X
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✦ Synopsis
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 re#ect the underlying low-dimensional dynamics of the instability.