A combined analytical and numerical analysis of the flow-acoustic coupling in a cavity-pipe system
A combined analytical and numerical analysis of the flow-acoustic coupling in a cavity-pipe system
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DOI：
10.1007/s00162-018-0462-4
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发表时间：
2018-05
影响因子：
3.4
通讯作者：
M. Langthjem;M. Nakano
中科院分区：
文献类型：
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作者：
M. Langthjem;M. Nakano
通过分析和数值研究了流过装有长尾管的封闭圆柱形腔（膨胀室）时产生的声音。声音的产生是由于腔体内的自持流动振荡。这些振荡反过来可能会在尾管中产生驻（共振）声波。本文的主要兴趣在于这两个声源之间的相互作用。通过匹配渐近展开的方法获得了问题声学部分的解析近似解。发声流由基于轴对称涡环的离散涡流方法表示。通过数值示例证明，包含来自尾管的声反馈对于良好地表示声音特性至关重要。
The generation of sound by flow through a closed, cylindrical cavity (expansion chamber) accommodated with a long tailpipe is investigated analytically and numerically. The sound generation is due to self-sustained flow oscillations in the cavity. These oscillations may, in turn, generate standing (resonant) acoustic waves in the tailpipe. The main interest of the paper is in the interaction between these two sound sources. An analytical, approximate solution of the acoustic part of the problem is obtained via the method of matched asymptotic expansions. The sound-generating flow is represented by a discrete vortex method, based on axisymmetric vortex rings. It is demonstrated through numerical examples that inclusion of acoustic feedback from the tailpipe is essential for a good representation of the sound characteristics.