A numerical study of the hole-tone phenomenon subjected to non-axisymmetric shape perturbations of the jet nozzle

Mikael A. Langthjem, Masami Nakano

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

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 languageEnglish
Pages (from-to)127-153
Number of pages27
JournalTheoretical and Computational Fluid Dynamics
Volume29
Issue number3
DOIs
Publication statusPublished - 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

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