気流を伴う単純空胴型消音器における共鳴音の卓越化について

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タイトル別名
  • Predominance of Resonance in Expansion-Cavity-Type Muffler with Flow
  • 2nd Report, Generalization of Predominance Phenomena of Tail Pipe Rosonance
  • 第2報,尾管共鳴音の卓越化現象の統一的整理

抄録

Predominant resonance can occur in flow-induced noise from an expansion-cavity-type muffler for particular combinations of muffler configuration and flow velocity. This phenomenon is caused by self-excited oscillation based on the feedback response from acoustic resonances of the muffler to shear flow. Usually, the sound pressure level is much higher when predominance of tail pipe resonance rather than cavity resonance occurs. The predominance of tail pipe resonance is shown to be strongly influenced by both the frequency characteristics of acoustic amplification of the tail pipe and the frequency of velocity fluctuation with a certain phase criterion. The predominance phenomena can be generalized using a new dimensionless independent variable, (L/l')(1/M), where L, l' and M are cavity length, acoustically equivalent tail pipe length and Mach number in the tail pipe, respectively.

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