Journal of the Korean Society of Combustion (한국연소학회지)

The Korean Society of Combustion (한국연소학회)
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Evaluation of Combustion Instability in a Model Gas Turbine Adopting Flame Transfer Function and Dynamic Mode Decomposition

화염 전달함수 및 DMD 기법을 이용한 모형 가스터빈의 연소불안정성 평가

  • Son, Jinwoo (Department of Mechanical Engineering, Sejong University) ;
  • Sohn, Chae Hoon (Department of Mechanical Engineering, Sejong University) ;
  • Yoon, Jisu (School of Mechanical and Aerospace Engineering, Seoul National University) ;
  • Yoon, Youngbin (School of Mechanical and Aerospace Engineering, Seoul National University)
  • 손진우 (세종대학교 기계공학과) ;
  • 손채훈 (세종대학교 기계공학과) ;
  • 윤지수 (서울대학교 기계항공공학부) ;
  • 윤영빈 (서울대학교 기계항공공학부)
  • Received : 2017.03.16
  • Accepted : 2017.04.07
  • Published : 2017.06.30
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Abstract

To evaluate the combustion instability of a gas turbine combustor, the DMD technique was applied. The mode frequency results for each fuel composition were compared with FFT(Fast Fourier Transform) results. The damping coefficient, which is a quantitative parameter for combustion instability, was evaluated for 5 experimental cases. The flame transfer function (FTF) was calculated in the most unstable test case. In deriving the FTF, gain and phase were calculated using DMD technique. As a result of the analysis of the OH radical perturbation of the DMD, the heat release fluctuation was the highest at 100 Hz, at which the highest value of gain is observed. The frequency of FFT and FTF were different. In order to clarify the reason for this, FTF for various resonance frequencies was performed and it shows that the pattern of gain was similar to FFT.

Keywords

References

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