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Acoustic Coupling between Longitudinal and Transverse Modes in an Annular Gas Turbine Combustor

환형 가스터빈 연소기에서 종방향 및 횡방향 음향모드 커플링

  • Kim, Jihwan (School of Mechanical and Authomotive Engineering, Gangneung-Wonju National University) ;
  • Kim, Daesik (School of Mechanical and Authomotive Engineering, Gangneung-Wonju National University)
  • 김지환 (강릉원주대학교 기계자동차공학부) ;
  • 김대식 (강릉원주대학교 기계자동차공학부)
  • Received : 2017.09.08
  • Accepted : 2018.02.20
  • Published : 2018.03.30

Abstract

Transverse acoustic mode in annular combustion chambers affects air-fuel mixing characteristics in the nozzle and can result in heat release fluctuations in the combustor. In addition, the acoustic mode coupling between the nozzle and the combustion chamber is one of the key parameters determining combustion instability phenomenon in the annular combustor. In this study, acoustic coupling between the nozzle and annular combustor was numerically analyzed using 3D-based in house FEM code. As a result, it was found that the acoustic mode inside the combustion chamber at anti-node locations of the transverse mode was strongly influenced by the nozzle inlet boundary conditions.

Acknowledgement

Supported by : 산업통상자원부, 한국연구재단

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