Influence of Pairing Asymmetry on Thermoacoustic Instabilities in a Can-annular Combustor

Dahyun Bae; Kihun Moon; Kyu Tae Kim

doi:10.15231/jksc.2023.28.1.040

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2023 Vol.28, Issue 1 Preview Page

Research Article

Influence of Pairing Asymmetry on Thermoacoustic Instabilities in a Can-annular Combustor 페어링 비대칭성이 캔-환형 연소기의 열음향 불안정에 미치는 영향

31 March 2023. pp. 40-48

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Abstract

The influence of pairing asymmetry on thermoacoustic instabilities was experimentally investigated in an odd-numbered can-annular combustion system, using 3D FEM-based Helmholtz simulation and acoustic wave decomposition method. We show that a pair of degenerate mode is split into two modes with a frequency difference of 6 Hz, which is induced by a pairing-asymmetry-related geometrical property. Interestingly, the modal interaction between splitting modes gives rise to the periodic transition between standing and spinning azimuthal instabilities in the annular cross-talk section.

Keywords

Azimuthal instabilities

Can-annular combustor

Combustion instability

Cross-talk

Hydrogen

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Information

Publisher :The Korean Society Combustion
Publisher(Ko) :한국연소학회
Journal Title :Journal of The Korean Society Combustion
Journal Title(Ko) :한국연소학회지
Volume : 28
No :1
Pages :40-48
Received Date : 2022-12-28
Revised Date : 2023-03-02
Accepted Date : 2023-03-09
DOI :https://doi.org/10.15231/jksc.2023.28.1.040

Journal of The Korean Society Combustion ISSN:1226-0959(Print) 2466-2089(Online) 한국연소학회지

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