Acoustic Analysis of a Gas Turbine Combustor Using a Mean Flow Coupled 3D FEM Approach

Jaewoo Jang; Sojung Park; Youngbin Yoon; Daesik Kim

doi:10.6108/KSPE.2026.30.4.064

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2026 Vol.30, Issue 4 Preview Page Next Page

RESEARCH PAPERS

Acoustic Analysis of a Gas Turbine Combustor Using a Mean Flow Coupled 3D FEM Approach Mean flow를 고려한 3D FEM 기반 가스터빈 연소기에서의 음향해석

31 August 2026. pp. 64-72

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Abstract

In this study, 3D finite element acoustic analysis based on the Linearized Navier Stokes was performed to assess the effect of mean flow on combustor acoustics. The CFD mean flow field was mapped onto the acoustic domain, with turbulent viscosity used as an acoustic damping term. Including the mean flow brought the predicted instability frequencies closer to the measured values, while the growth rate was zero without mean flow and became negative once it was included showed that the acoustic damping characteristics were identified by accounting for the mean flow. The predicted mode shapes also agreed well with the measured pressure fluctuation distributions, and the mean flow coupled 3D FEM model predicted the acoustic modes of the observed instability frequencies.

Keywords

Gas Turbine Combustor

3D FEM

Mean Flow

Combustion Instability

본 연구에서는 평균 유동이 연소기 음향 특성에 미치는 영향을 평가하기 위해 선형화 나비에 스토크스 기반 3차원 유한요소 음향해석을 수행하였다. CFD 평균 유동장을 음향해석 영역에 매핑하고 난류 점성을 음향 감쇠항으로 반영하였다. 평균 유동을 반영한 경우 예측된 불안정 주파수가 실험값에 더 근접하였으며, 성장률은 평균 유동 미 반영 시 0, 반영 시 음의 값으로 나타나 평균 유동을 고려함으로써 음향 감쇠 특성을 확인할 수 있었다. 또한 예측된 모드 형상이 실험 압력 섭동 분포와 잘 일치하였으며, 평균 유동을 고려한 3D FEM 모델이 실험에서 관측된 불안정 주파수의 음향 모드를 예측하였다.

키워드

가스터빈 연소기

3차원 유한요소 모델

평균유동

연소불안정

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Information

Publisher :The Korean Society of Propulsion Engineers
Publisher(Ko) :한국추진공학회
Journal Title :Journal of the Korean Society of Propulsion Engineers
Journal Title(Ko) :한국추진공학회지
Volume : 30
No :4
Pages :64-72
Received Date : 2026-06-02
Revised Date : 2026-06-25
Accepted Date : 2026-06-28
DOI :https://doi.org/10.6108/KSPE.2026.30.4.064

Journal of the Korean Society of Propulsion Engineers ISSN:1226-6027(Print) 2288-4548(Online) 한국추진공학회지

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