Amplitude death in coupled thermoacoustic oscillators with frequency detuning

Hiroaki Hyodo, Tetsushi Biwa

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

Abstract

Thermoacoustic oscillation is a harmful vibration in combustors of a gas turbine engine because it can damage the combustors. Development of a suppression method of thermoacoustic oscillation is urgent necessity. Recently, a coupling-induced amplitude death phenomenon was reported experimentally and numerically in thermoacoustic oscillators of Sondhauss type. Since the coupling was established only by using hollow tubes that connects two oscillators, this method can be a simple and reliable method to stop the oscillations, compared to active control method involving electronics and acoustic drivers. In this study, the tube coupling is further tested for the coupled thermoacoustic oscillators with frequency detuning, in order to explore the possibility of stronger suppression effect. The linear stability of the coupled oscillators is numerically obtained based on hydrodynamic equations. We describe that the amplitude death is realized with much smaller tube diameter than that of coupled thermoacoustic oscillators with no detuning. Also, we describe that the tube length resulting in the amplitude death is different from that of coupled identical oscillators. These numerical results are compared with experiments to confirm the validity.

Original languageEnglish
Title of host publicationProceedings of the 23rd International Congress on Acoustics
Subtitle of host publicationIntegrating 4th EAA Euroregio 2019
EditorsMartin Ochmann, Vorlander Michael, Janina Fels
PublisherInternational Commission for Acoustics (ICA)
Pages5627-5632
Number of pages6
ISBN (Electronic)9783939296157
DOIs
Publication statusPublished - 2019
Event23rd International Congress on Acoustics: Integrating 4th EAA Euroregio, ICA 2019 - Aachen, Germany
Duration: 2019 Sep 92019 Sep 23

Publication series

NameProceedings of the International Congress on Acoustics
Volume2019-September
ISSN (Print)2226-7808
ISSN (Electronic)2415-1599

Conference

Conference23rd International Congress on Acoustics: Integrating 4th EAA Euroregio, ICA 2019
CountryGermany
CityAachen
Period19/9/919/9/23

Keywords

  • Amplitude death
  • Coupling
  • Thermoacoustics

ASJC Scopus subject areas

  • Mechanical Engineering
  • Acoustics and Ultrasonics

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