Numerical simulation of the hole-tone feedback cycle based on the discrete vortex method and the acoustic analogy

Mikael A. Langthjem, Masami Nakano

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

1 Citation (Scopus)

Abstract

An axisymmetric numerical simulation approach to the holetone feedback problem is developed. It is based on the discrete vortex method and an 'acoustic analogy' representation of flow noise sources. The shear layer of the jet is represented by 'free' discrete vortex rings, and the jet nozzle and the end plate by bound vortex rings. A vortex ring is released from the nozzle at each time step in the simulation. The newly released vortex rings are disturbed by acoustic feedback. The simulated frequencies f follow the criterion L/u c+L/c0 = n/f where L is the gap length, uc is the shear layer convection velocity, C0 is the speed of sound, and n is a mode number (n = 1/2, 1, 3/2, . . .). This is in agreement with experimental observations. The numerical model also display mode shifts (jumps in the chosen value of n), as seen in experiments.

Original languageEnglish
Title of host publicationProceedings of the 4th ASME/JSME Joint Fluids Engineering Conference
Subtitle of host publicationVolume 2, Part A, Symposia
EditorsA. Ogut, Y. Tsuji, M. Kawahashi
PublisherAmerican Society of Mechanical Engineers
Pages33-40
Number of pages8
ISBN (Print)0791836967, 9780791836965
DOIs
Publication statusPublished - 2003 Jan 1
Externally publishedYes
Event4th ASME/JSME Joint Fluids Engineering Conference - Honolulu, HI, United States
Duration: 2003 Jul 62003 Jul 10

Publication series

NameProceedings of the ASME/JSME Joint Fluids Engineering Conference
Volume2 A

Other

Other4th ASME/JSME Joint Fluids Engineering Conference
CountryUnited States
CityHonolulu, HI
Period03/7/603/7/10

ASJC Scopus subject areas

  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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