A three-dimensional numerical study into non-axisymmetric perturbations of the hole-tone feedback cycle

M. A. Langthjem, Masami Nakano

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper is concerned with the hole-tone feedback cycle problem, also known as Rayleigh's bird-call. A simulation method for analyzing the influence of non-axisymmetric perturbations of the jet on the sound generation is described. In planned experiments these perturbations will be applied at the jet nozzle via piezoelectric or electro-mechanical actuators, placed circumferentially inside the nozzle at its exit. The mathematical model is based on a three-dimensional vortex method. The nozzle and the holed end-plate are represented by quadrilateral vortex panels, while the shear layer of the jet is represented by vortex rings, composed of vortex filaments. The sound generation is described mathematically using the Powell-Howe theory of vortex sound. The aim of the work is to understand the effects of a variety of flow perturbations, in order to control the flow and the accompanying sound generation.

Original languageEnglish
Title of host publicationIUTAM Symposium on Unsteady Separated Flows and their Control - Proceedings of the IUTAM Symposium "Unsteady Separated Flows and their Control"
Pages581-586
Number of pages6
DOIs
Publication statusPublished - 2009 Dec 1
EventIUTAM Symposium on Unsteady Separated Flows and their Control - Corfu, Greece
Duration: 2007 Jun 182007 Jun 22

Publication series

NameSolid Mechanics and its Applications
Volume14
ISSN (Print)1875-3507

Other

OtherIUTAM Symposium on Unsteady Separated Flows and their Control
CountryGreece
CityCorfu
Period07/6/1807/6/22

Keywords

  • Aeroacoustics
  • Self-sustained flow oscillations
  • Three-dimensional vortex method

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Automotive Engineering
  • Aerospace Engineering
  • Acoustics and Ultrasonics
  • Mechanical Engineering

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