Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Experimental Study on Cellular Instabilities in Diluted Syngas-Air Premixed Flames

희석제가 첨가된 합성가스-공기 예혼합화염에 있어서 셀 불안정성에 관한 실험적 연구

  • ;
  • 송원식 (부경대학교 기계공학과) ;
  • 박정 (부경대학교 기계공학과) ;
  • 김정수 (부경대학교 기계공학과) ;
  • 윤진한 (한국기계연구원 그린환경에너지기계연구본부) ;
  • 길상인 (한국기계연구원 그린환경에너지기계연구본부)
  • Received : 2010.08.30
  • Accepted : 2010.10.09
  • Published : 2010.10.30
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Abstract

Experiments were conducted to investigate the effects of added diluents (carbon dioxide, nitrogen, and helium) on cellular instabilities in outwardly propagating spherical syngas-air premixed flames. Laminar burning velocities and Markstein lengths were measured by analyzing high-speed schlieren images at various diluent concentrations and equivalence ratios. Experimental results showed substantial reduction of the laminar burning velocities and of the Markstein lengths with the diluent additions in the fuel blends. Effective Lewis numbers of helium-diluted syngas-air flames increased but those of carbon dioxide- and nitrogen-diluted syngas-air flames decreased in increase of diluents in the reactant mixtures. With helium diluent, the propensity for cells formation was significantly diminished, whereas the cellular instabilities for carbon dioxide- and nitrogen-diluted syngas-air flames were not suppressed.

본 연구는 구형으로 전파하는 합성가스-공기 화염의 셀 불안정성에 있어서 헬륨, 이산화탄소, 질소의 희석제 첨가효과에 관하여 실험을 수행하였다. 층류화염속도와 Markstein Length는 여러 희석제 농도와 당량비에서 측정된 쉴리렌 이미지를 분석함으로써 측정하였다. 실험결과 반응혼합물에 희석제를 첨가했을 경우 층류화염속도와 Markstein Length는 두드러진 감소를 보였다. 희석제로 헬륨을 첨가한 합성가스-공기화염에서의 유효 루이스 수는 증가했지만 이산화탄소와 질소를 첨가시킨 혼합물에서는 희석제의 첨가량이 증가할수록 유효 루이스 수는 감소하였다. 또한, 헬륨으로 희석시킨 경우 셀 형성은 현저하게 억제된 경향성을 보였으나 이산화탄소나 질소를 첨가했을 경우 셀 불안정성이 완화되는 효과는 없었다.

Keywords

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