Abstract
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.
Original language | English |
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Pages (from-to) | 451-473 |
Number of pages | 23 |
Journal | Theoretical and Computational Fluid Dynamics |
Volume | 32 |
Issue number | 4 |
DOIs | |
Publication status | Published - 2018 Aug 1 |
Keywords
- Aeroacoustics
- Discrete vortex method
- Flow–sound interaction
- Matched asymptotic expansions
- Self-sustained flow oscillations
- Vortex sound
ASJC Scopus subject areas
- Computational Mechanics
- Condensed Matter Physics
- Engineering(all)
- Fluid Flow and Transfer Processes