A combined analytical and numerical analysis of the flow-acoustic coupling in a cavity-pipe system
| Autor: | Masami Nakano, Mikael A. Langthjem |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Fluid Flow and Transfer Processes
Physics Expansion chamber Numerical analysis General Engineering Computational Mechanics 02 engineering and technology Mechanics Acoustic wave Condensed Matter Physics 01 natural sciences Method of matched asymptotic expansions 010305 fluids & plasmas Vortex ring Vortex 020303 mechanical engineering & transports 0203 mechanical engineering Flow (mathematics) Computer Science::Sound 0103 physical sciences Aeroacoustics |
| Zdroj: | Theoretical and Computational Fluid Dynamics. 32:451-473 |
| ISSN: | 1432-2250 0935-4964 |
| DOI: | 10.1007/s00162-018-0462-4 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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