Journal of the Korean Society of Combustion (한국연소학회지)

The Korean Society of Combustion (한국연소학회)
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A Study of Combustion Instability Mode in Dual Swirl Gas Turbine Combustor by PLIF and Chemiluminescence Measurement

PLIF 및 자발광 계측을 이용한 이중선회 가스터빈 연소기에서 연소불안정 모드 연구

  • Choi, Inchan ;
  • Lee, Keeman ;
  • Juddoo, Mrinal (Department of Aerospace, Mechanical and Mechatronic Engineering, University of Sydney) ;
  • Masri, A.R. (Department of Aerospace, Mechanical and Mechatronic Engineering, University of Sydney)
  • 최인찬 (순천대학교 대학원 우주항공공학전공) ;
  • 이기만 (순천대학교 기계우주항공공학부) ;
  • ;
  • Received : 2014.01.29
  • Accepted : 2014.03.07
  • Published : 2014.03.31
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Abstract

This paper described an experimental investigations of combustion instability mode in a lean premixed dual swirl combustor for micro-gasturbine system. When such the instability occurs, a strong coupling between pressure oscillations and unsteady heat release excites a self-sustained acoustic wave which results in a loud, annoyed sound and may also lead a structural damage to the combustion chamber. The detailed period of flame behavior and heat release in combustion instability mode have been examined with high speed OH and CH-PLIF system and $CH^*$ chemiluminescence measurement, flame tomography with operated at 10 kHz and 6 kHz each. Experiment results suggest that unstable flame behavior has a specific frequency with 200 Hz and this frequency is accords with about 1/2 sub-harmonic of combustor resonance frequency, not fundamental frequency. This is very interesting phenomenon that have not reported yet from other previous works. Therefore, when a thermo-acoustic instability with Rayleigh criterion occurs, the fact that the period of heat release and flame behavior are different each other was proposed for the first time through this work.

Keywords

References

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