Influence of non-axisymmetric perturbations on the hole-tone feedback cycle: A numerical study

Mikael A. Langthjem, Masami Nakano

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

Abstract

The paper is concerned with the hole-tone feedback cycle problem, also known as Rayleigh's bird-call. A methodology for analyzing the influence of non-axisymmetric perturbations of the jet on the sound generation is described. These perturbations are 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 the discrete vortex method, using vortex fllament rings. The nozzle and the holed end-plate are represented by bound (fixed) axisymmetric vortex rings. The shear layer of the jet and the actuator-equipped downstream section of the nozzle are represented by three-dimensional vortex fllaments. The sound generation is described mathematically using the Powell-Howe theory of vortex sound. The ultimate aim of the work is to control the flow and the accompanying sound generation.

Original languageEnglish
Title of host publicationInstitute of Noise Control Engineering of the USA - 35th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2006
Pages1505-1513
Number of pages9
Publication statusPublished - 2006 Dec 1
Externally publishedYes
Event35th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2006 - Honolulu, HI, United States
Duration: 2006 Dec 32006 Dec 6

Publication series

NameInstitute of Noise Control Engineering of the USA - 35th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2006
Volume3

Other

Other35th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2006
CountryUnited States
CityHonolulu, HI
Period06/12/306/12/6

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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