Journal of the Korean Society of Combustion (한국연소학회지)

The Korean Society of Combustion (한국연소학회)
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An Experimental Study of Instability Mode Analysis in a Model Gas Turbine Combustor

모형 가스터빈 연소기에서의 연소 불안정 모드 분석에 관한 실험적 연구

  • 이장수 (서울대학교 기계항공공학부) ;
  • 김민기 (서울대학교 기계항공공학부) ;
  • 박성순 (서울대학교 기계항공공학부) ;
  • 이종근 (펜실베니아 주립대학교) ;
  • 윤영빈 (서울대학교 기계항공공학부)
  • Received : 2009.12.28
  • Accepted : 2010.03.15
  • Published : 2010.03.31
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Abstract

The main objective of this study was investigation of combustion instability characteristics in a lean partially premixed gas turbine dump combustor. Dynamic pressure transducers were located on combustor and inlet section to observe combustion pressure oscillation and difference at each measurement places. Also flame shape and $CH^*$ chemiluminescence were measured using a high speed ICCD camera. The combustor length was varied in order to have different acoustic characteristics from 800 to 1090 mm. The first section of this paper shows the stability map in model gas turbine combustor. And the effects of combustor length, mixture velocity in the mixing section and equivalence ratio were studied by the pressure perturbation and heat release oscillation. Also, the instability frequency and mode analysis were studied in last two sections. We observed two dominant instability frequencies in this study. Lower frequencies were obtained at lower equivalence ratio region and it was associated with a fundamental longitudinal mode of combustor length. Higher frequencies were observed in higher equivalence ratio conditions. It was related to secondary longitudinal mode of combustor and mixing section. In this instability characteristics, pressure oscillation of mixing section part was larger than pressure oscillation of combustor. As a result, combustion instability was strongly affected by acoustic characteristics of combustor and mixing section geometry.

Keywords

References

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