Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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A Schlieren-photographic Visualization of the Methane/Air Premixed Flame Propagating inside a Rectangular Tube Locally-perturbed by an Ultrasonic Standing Wave

국소적 정상초음파장에 의해 교란되어 사각튜브형 연소실 내에서 전파하는 메탄/공기 예혼합화염의 슐리렌기법에 의한 가시화

  • Kim, Min Sung (Department of Mechanical Engineering, Graduate School, Pukyong National University) ;
  • Kim, Jeong Soo (Department of Mechanical Engineering, Pukyong National University) ;
  • Hwang, Yeong Yeun (Department of Control and Instrumentation Engineering, Pukyong National University)
  • Received : 2014.06.08
  • Accepted : 2014.07.11
  • Published : 2014.08.01
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Abstract

This experimental study has been conducted to scrutinize the effects of an ultrasonic standing wave (USW) on the propagating velocity and structure of methane/air premixed flame. Propagating flame was caught by high-speed Schlieren photography, and the variation of flame-behavior was analyzed in detail. It is revealed that horizontal splitting in burnt zone is resulted by the USW, and the flame propagation velocity is augmented due to the strengthened chemical reaction. Evolutionary feature of the flame perturbed by USW, maintaining a pseudo-symmetry of top and bottom flame-front about the propagation axis tends to be free from buoyancy effect.

국소적 정상초음파장의 교란이 관내 메탄/공기 예혼합화염의 전파속도 및 화염구조에 미치는 영향을 규명하기 위한 실험적 연구를 수행하였다. 슐리렌가시화기법을 이용하여 정상초음파 유무에 따른 화염선단 발달과정의 변이를 상세히 관찰하였다. 정상초음파가 개재할 때, 기연부에서 가로방향의 줄무늬가 생성되었고, 연소반응의 촉진으로 화염의 속도는 증가하였으며, 화염의 발달과정이 부력의 영향으로부터 자유로워져 화염선단의 상하 대칭성을 유지하려는 경향을 보인다.

Keywords

References

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