Fundamental Study on CFD-Based Derivation of Turbine Inlet Acoustic Boundary Conditions for Gas Turbine Combustion Instability Modeling

Juhwan Lee; Daesik Kim

doi:10.15231/jksc.2026.31.2.034

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2026 Vol.31, Issue 2 Preview Page Next Page

Research Article

Fundamental Study on CFD-Based Derivation of Turbine Inlet Acoustic Boundary Conditions for Gas Turbine Combustion Instability Modeling 가스터빈 연소불안정 모델링을 위한 CFD 기반 터빈 입구 음향 경계조건 도출 기초 연구

30 June 2026. pp. 34-40

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Abstract

Combustion instability in gas turbine combustors is strongly influenced by the acoustic boundary conditions at the inlet and outlet, and in particular, the acoustic characteristics at the turbine inlet are one of the primary factors governing the acoustic field inside the combustor. However, since the actual turbine inlet involves complex geometries and high-temperature, high-pressure operating conditions, acoustic boundary conditions at the turbine inlet are often simplified or arbitrarily assumed in numerical analyses. As a foundational step toward deriving acoustic boundary conditions from computational fluid dynamics (CFD) simulations, this study validates a procedure for computing reflection and transmission coefficients using compressible unsteady CFD analysis. A verification geometry incorporating a semi-cylindrical obstacle in a duct was modeled in two dimensions, and simulations were conducted under both quiescent and mean flow conditions. The computed results reproduced the overall frequency-dependent trends observed in existing experimental data, confirming that the CFD-based procedure can serve as a foundational analysis method for evaluating the acoustic response at the turbine inlet.

Keywords

Combustion instability

Thermoacoustics

Acoustic boundary condition

Reflection/Transmission coefficient

Multi-Microphone method

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Information

Publisher :The Korean Society of Combustion
Publisher(Ko) :한국연소학회
Journal Title :Journal of the Korean Society of Combustion
Journal Title(Ko) :한국연소학회지
Volume : 31
No :2
Pages :34-40
Received Date : 2026-05-06
Revised Date : 2026-06-04
Accepted Date : 2026-06-04
DOI :https://doi.org/10.15231/jksc.2026.31.2.034

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

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