Abstract
A phenomenon of thermoacoustic oscillation is seen as an undesirable vibration in combustion engineering as it can cause serious damage to the combustor. Lots of methods such as controlling a secondary fuel supply and addition of Helmholtz resonators are proposed to suppress the oscillations, but they often become complicated. As a simple and reliable method, we try to make use of mutual interaction of the coupled thermoacoustic oscillators to stop oscillations completely. It has been demonstrated in the system of coupled electrical circuits that “amplitude death,” meaning the stabilization of zero amplitude states, is induced by time-delay coupling even when the oscillators have the same frequency. In this study, we introduce the time-delay coupling in thermoacoustic oscillators by using hollow tubes. In the tube coupling, the sound propagation time through the tube corresponds to the delay time, while the tube diameter controls the coupling strength. The condition of amplitude death is experimentally found for various tube lengths, diameters, and number of tubes. Thus, the tube coupling provides the way to annihilate thermoacoustic oscillations. The results are compared with those of linear stability analysis based on basic equations of hydrodynamics. Both results are qualitatively consistent with each other.
Published Version
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