気流を伴う挿入管型消音器における共鳴音の卓越化について

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  • Predominance of Resonance in Insert-Pipe-Type Muffler with Flow

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For insert-pipe-type mufflers with flow, the predominance of resonance in the flow-induced noise occured in particular combinations of muffler configuration and flow velocity as well as for simple expansion-cavity-type mufflers. The phenomenon is caused by a self-excited oscillation based on the feedback response from acoustic resonances of the muffler to the shear flow. Transitions from a tail pipe resonance to a cavity resonance and from a cavity resonance to a tail pipe resonance were also observed. This is called “resonance frequency transition”. The coupled effect of the predominance of resonance and the frequency transition was investigated in the present research. For insert-pipe-type mufflers, predominance of resonance occurred not only at tail pipe resonance frequencies but also at cavity resonance frequencies. Firstly, the frequency transition was demonstrated through the wave theory. Then, the predominance phenomena was expressed in a general way based on the wave theory and the feedback response from sound to flow.

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