Abstract
This paper presents a numerical analysis of the hole-tone phenomenon (Rayleigh’s bird-call), based on a three-dimensional discrete vortex method. Evaluation of the sound generated by the self-sustained flow oscillations is based on the Powell–Howe theory of vortex sound and a boundary integral/element method. While the fundamental problem can be modeled well under the assumption of axial symmetry, the purpose of employing a full three-dimensional model is to investigate the influence of non-axisymmetric perturbations of the jet on the sound generation (with a view to flow control). Experimentally, such perturbations can be applied at the jet nozzle via piezoelectric or electro-mechanical actuators, placed circumferentially inside the nozzle at its exit. In the mathematical/numerical model, this is simulated by wave motions of a deformable nozzle. Both standing and traveling (rotating) waves are considered. It is shown that a considerable reduction of the sound generation is possible.
| Original language | English |
|---|---|
| Pages (from-to) | 127-153 |
| Number of pages | 27 |
| Journal | Theoretical and Computational Fluid Dynamics |
| Volume | 29 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2015 Jun 1 |
Keywords
- Aeroacoustics
- Boundary element method
- Flow control
- Self-sustained flow oscillations
- Three-dimensional vortex method
- Vortex sound
ASJC Scopus subject areas
- Computational Mechanics
- Condensed Matter Physics
- Engineering(all)
- Fluid Flow and Transfer Processes