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Mitigation of Limit Cycle Oscillations in a Turbulent Thermoacoustic System via Delayed Acoustic Self-feedback by Sahay, Ankit; Kushwaha, Abhishek; Pawar, Samadhan A.; R., Midhun P.; Dhadphale, Jayesh M.; Sujith, R. I. is a scholarly article available to read on EtoBox.

What is Mitigation of Limit Cycle Oscillations in a Turbulent Thermoacoustic System via Delayed Acoustic Self-feedback about?

We report the occurrence of amplitude death (AD) of limit cycle oscillations in a bluff body stabilized turbulent combustor through delayed acoustic self-feedback. Such feedback control is achieved by coupling the acoustic field of the combustor to itself through a single coupling tube attached near the anti-node position of the acoustic standing wave. We observe that the amplitude and dominant frequency of the limit cycle oscillations gradually decrease as the length of the coupling tube is increased. Complete suppression (AD) of these oscillations is observed when the length of the coupling tube is nearly 3/8 times the wavelength of the fundamental acoustic mode of the combustor. Meanwhile, as we approach this state of amplitude death, the dynamical behavior of acoustic pressure changes from the state of limit cycle oscillations to low-amplitude chaotic oscillations via intermittency. We also study the change in the nature of the coupling between the unsteady flame dynamics and the acoustic field as the length of the coupling tube is increased. We find that the temporal synchrony between these oscillations changes from the state of synchronized periodicity to desynchronized aperi

Author

Sahay, Ankit; Kushwaha, Abhishek; Pawar, Samadhan A.; R., Midhun P.; Dhadphale, Jayesh M.; Sujith, R. I.

Published

2022

Language

EN