Study on Suppression of Thermoacoustic Oscillations

Abstract

This paper reports suppression of self-sustained oscillations by mutual interactions between the oscillators and by delayed feedback, theoretically in the case of van der Pol oscillators and experimentally in the case of acoustic oscillators. For the acoustic oscillators, the dissipative coupling is achieved by a needle valve, whereas the delayed coupling, and also the delayed feedback, is provided by a connecting tube of a half-wavelength of the acoustic oscillations. Because only the simple components are required in the couplings, this method would be highly reliable in suppressing the oscillations.