Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Transition Phenomenon from a Flat Flame to Turbulent Flame Motions by External Laser

외부 레이저에 의한 평면화염에서 난류화염거동까지의 천이현상

  • Park, June Sung (Environment & Plant Team, Korean Register of Shipping) ;
  • Choi, Byung Chul (Environment & Plant Team, Korean Register of Shipping) ;
  • Fujita, Osamu (Division of Mechanical and Space Engineering, Hokkaido Univ.)
  • 박준성 ((사)한국선급 환경플랜트팀) ;
  • 최병철 ((사)한국선급 환경플랜트팀) ;
  • Received : 2012.07.17
  • Accepted : 2012.09.15
  • Published : 2012.12.01
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Abstract

Experiments with premixed flames in a tube have been conducted to investigate the transition phenomenon from a laminar flat flame to turbulent motions. To induce this phenomenon, a flat flame is formed in a tube. Then, the local velocity at the center of the flat flame surface is increased using $CO_2$ laser irradiation. The deformed flame front propagates with an increase in the total flame surface and oscillating instability. Eventually, the flame front accelerates explosively, and it shows turbulent flame motions with a strong noise. The dynamic behaviors of the flame front prior to the turbulent motions are analyzed in this study to elucidate this process. The physical model of the process is presented according to observations.

관내 예혼합화염에서 나타나는 평면화염부터 난류화염거동까지의 천이현상에 대한 실험적 연구를 수행하였다. 천이현상의 관찰을 위해 관내에 평면화염을 형성하였고, 화염면 중심에 $CO_2$ 레이저를 조사하여 국부 화염속도를 증가시켰다. 레이저에 의해 변형된 화염은 전체 화염면적의 증가와 진동 불안정성의 거동을 보이며 전파한 후, 큰 소음과 함께 난류화염의 거동을 보이며 관 바닥으로 전파한다. 본 연구에서는 난류화염거동이 나타나기 전까지의 변형된 화염에 대한 동적 거동을 관찰하여 분석하였고, 이에 대한 물리적 모델을 제시하였다.

Keywords

References

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