Acoustic modes induced by flow in a pipe with two closed side-branches |
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Authors: | Miros?aw Meissner |
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Institution: | Institute of Fundamental Technological Research, Polish Academy of Sciences, ?wi?tokrzyska 21, 00-049 Warsaw, Poland |
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Abstract: | An air flow in a pipe with two closed side-branches can induce high pressure pulsations in a pipe system. This phenomenon has been investigated and the results are reported in this paper. A simple theoretical model based on a wave transmission was used to determine a resonance condition associated with an acoustic coupling between branches. In the model a plane wave approximation and an impedance representation of a branch were applied. The experiment was carried out in a pipe system with a relatively large distance between branches compared to branch lengths. A frequency and a pressure of pulsations were measured in a wide range of length of downstream branch. A support for the theory is provided by a favorable comparison between experimental data and calculated resonant frequencies of the system. |
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