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Early Warning Signs of Imminent Thermoacoustic Oscillations Through Critical Slowing Down
- Source :
- Journal of Engineering for Gas Turbines and Power. 141
- Publication Year :
- 2018
- Publisher :
- ASME International, 2018.
-
Abstract
- Critical slowing down (CSD) is a phenomenon that is common to many complicated dynamical systems as they approach critical transitions/bifurcations. We demonstrate that pressure signals measured during the onset of thermoacoustic instabilities in a gas turbine engine test exhibit evidence of CSD well before the oscillation amplitude increases. CSD was detected through both the variance and the lag-1 auto-regressive coefficient in a rolling window of the pressure signal. Increasing trends in both metrics were quantified using Kendall's τ, and the robustness and statistical significance of the observed increases were confirmed. Changes in the CSD metrics could be detected several seconds prior to changes in the oscillation amplitude. Hence, real-time calculation of these metrics holds promise as early warning signals of impending thermoacoustic instabilities.
- Subjects :
- Physics
Gas turbines
Mechanical Engineering
Energy Engineering and Power Technology
Aerospace Engineering
01 natural sciences
010305 fluids & plasmas
Fuel Technology
Nuclear Energy and Engineering
Control theory
Robustness (computer science)
0103 physical sciences
Early warning signs
010306 general physics
Bifurcation
Subjects
Details
- ISSN :
- 15288919 and 07424795
- Volume :
- 141
- Database :
- OpenAIRE
- Journal :
- Journal of Engineering for Gas Turbines and Power
- Accession number :
- edsair.doi...........7ff9c8328a4477d1816c229c0be4d32d
- Full Text :
- https://doi.org/10.1115/1.4041963