Journal of the Korean Society of Combustion (한국연소학회지)

The Korean Society of Combustion (한국연소학회)
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A Study of Combustion Instability Mode according to the Variation of Combustor Length in Dual Swirl Gas Turbine Model Combustor

연소실 길이에 따른 이중선회 가스터빈 모델 연소기에서 연소불안정 모드 연구

  • Jang, Munseok (Department of Aerospace Engineering, Sunchon National University) ;
  • Lee, Keeman (School of Mechanical and Aerospace Engineering, Sunchon National University)
  • 장문석 (순천대학교 대학원 우주항공공학전공) ;
  • 이기만 (순천대학교 기계우주항공학부)
  • Received : 2016.04.25
  • Accepted : 2016.06.12
  • Published : 2016.06.30
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Abstract

This study described the experimental investigations of combustion instability in a model gas turbine combustor. Strong coupling between pressure oscillations and unsteady heat release excites a self-sustained acoustic wave, which results in a loud and annoyed sound, and may also lead to a structural damage to the combustion system. In this study, in order to examine the combustion instability phenomenon of a dual swirling combustor configuration, the information of heat release and pressure fluctuation period with respect to the variation in both thermal power and combustor length was collected experimentally. As a result, the fundamental acoustic frequency turned out to increase with the increasing thermal power without respect to the combustor length. The frequency response to the combustor length was found to have two distinct regimes. In a higher power regime the frequency significantly decreases with the combustor length, as it is expected from the resonance of gas column. However, in a lower power regime it is almost insensitive to the combustor length. This insensitive response might be a result of the beating phenomenon between the interacting pilot and main flames with different periods.

Keywords

References

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