Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Effects of the Equivalence Ratio on Propagation Characteristics of CH4-Air Premixed Flame Intervened by an Ultrasonic Standing Wave

정상초음파가 개재하는 CH4-Air 예혼합화염의 전파특성에 대한 당량비의 영향

  • 서항석 (부경대학교 대학원 에너지시스템공학과) ;
  • 이상신 (부경대학교 대학원 에너지시스템공학과) ;
  • 김정수 (부경대학교 기계공학과)
  • Received : 2013.01.31
  • Accepted : 2013.03.20
  • Published : 2013.04.01
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Abstract

An experimental study has been conducted to investigate the effects of equivalence ratio on the propagation characteristics of $CH_4$-air premixed flame intervened by an ultrasonic standing wave. A Schlieren photography was used for the flame structure visualization, and the flame propagation behavior was investigated in detail throughout the post-processing analysis. It is found that the structural variation of methane/air premixed flame caused by the intervention of ultrasonic standing wave give rise to the enhancement of combustion reaction and flame propagation velocity. Effectiveness of the standing wave on the flame velocity decreases as the equivalence ratio increases. Larger flame velocity with the standing wave becomes undistinguishable in a specific range of equivalence ratios.

정상초음파장이 개재하는 메탄/공기 예혼합화염의 전파특성에 대한 당량비의 영향을 실험적 연구결과로 제시한다. 화염구조 가시화는 슐리렌 기법을 이용하였으며, 이미지 후처리를 통해 화염 전파 거동을 면밀히 관찰하였다. 정상초음파에 의한 화염 구조 변화가 연소반응을 촉진시켜 화염 전파속도를 증가시키는 것을 알 수 있었으며, 당량비가 증가할수록 정상초음파에 의한 화염전파속도의 증분은 감소하게 되고, 속도변화가 미미한 당량비 구간이 존재한다는 사실을 확인할 수 있었다.

Keywords

References

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Cited by

  1. A Schlieren-photographic Visualization of the Methane/Air Premixed Flame Propagating inside a Rectangular Tube Locally-perturbed by an Ultrasonic Standing Wave vol.18, pp.4, 2014, https://doi.org/10.6108/KSPE.2014.18.4.043