Suppression of Spontaneous Gas Oscillations by Acoustic Self-Feedback

Tetsushi Biwa, Yoshiki Sawada, Hiroaki Hyodo, Soichiro Kato

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


This paper demonstrates a method of acoustical self-feedback to suppress spontaneous gas oscillations such as those observed in combustors of gas-turbine engines. Whereas a conventional feedback system consists of electromechanical devices, the present method achieves acoustical self-feedback with a hollow tube that connects two positions of the oscillation system. A model oscillator of combustion-driven gas oscillations is designed and built to demonstrate the applicability of the self-feedback concept. Stability analysis through measurements of Q values (quality factor) of oscillations shows that the desired delay time and gain are obtained when the tube length is equal to the odd integer times half the wavelength of the anticipated acoustic oscillations.

Original languageEnglish
Article number044020
JournalPhysical Review Applied
Issue number4
Publication statusPublished - 2016 Oct 28


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