Journal of the Korean Society of Combustion (한국연소학회지)

The Korean Society of Combustion (한국연소학회)
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An Experimental Study on Combustion Instability in Model Gas Turbine Combustor using Simulated SNG Fuel

모사 SNG 연료를 적용한 모델 가스터빈 연소기의 연소 불안정성에 관한 실험적 연구

  • Choi, Inchan (Department of Aerospace Engineering, Sunchon National University) ;
  • Lee, Keeman (School of Aerospace and Mechanical Engineering, Sunchon National University)
  • 최인찬 (순천대학교 대학원 우주항공공학전공) ;
  • 이기만 (순천대학교 기계우주항공공학부)
  • Received : 2015.02.02
  • Accepted : 2015.02.28
  • Published : 2015.03.30
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Abstract

The combustion instability was experimentally investigated in model gas turbine combustor with dual swirl burner. When such instability occurs, a strong coupling between pressure oscillation and unsteady heat release excites a self-sustained acoustic wave which results in a loud sound, and can even cause fatal damage to the combustor and entire system. In present study, to understand the combustion instability with a premixed mixture, the detailed periods of pressure and heat release data in unstable flame mode were investigated by various measurement methods at relatively rich condition and lean condition near flammable limits. Also, to prepare the utilization of synthetic natural gas (SNG) fuel in gas turbine system, an investigation was conducted using a simulated SNG including methane as a reference fuel to examine the effects of $H_2$ content on flame stability. These results provide that the instability due to flash-back behaviour like CIVB phenomenon occurred at rich condition, while the repetition of relighting and extinction caused the oscillation of lean condition near flammable limit. From the analysis of $H_2$ content effects, it is also confirmed that the instability frequency is proportional to the laminar burning velocity at both rich and lean condition.

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References

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