Abstract
We study the feedback coupling of thermoacoustic combustion instability from the viewpoint of a complex-systems approach, including the early detection of combustion instability. An upwardly traveling large-scale transverse vortex motion gives rise to large heat release rate fluctuations in the shear layer region between the inner and outer recirculation flows. The directional coupling from flow velocity to heat release rate fluctuations clearly appears near the rolled-up flame front generated by the developed transverse vortical structure. These events are strongly associated with the formation of a strong and local thermoacoustic power source cluster during combustion instability. A methodology combining symbolic dynamics-based analysis and a convolutional neural network enables the detection of a precursor of combustion instability.
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