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

The Korean Society of Mechanical Engineers (대한기계학회)
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Study on Flame Oscillations in Laminar Lift-off Butane Flames Diluted with Nitrogen

질소 희석된 부탄 부상화염에 있어서 화염진동에 관한 연구

  • Yoon, Sung-Hwan (Dept. of Energy System Engineering, Pukyong Nat'l Univ.) ;
  • Park, Jeong (Dept. of Mechanical Engineering, Pukyong Nat'l Univ.) ;
  • Kwon, Oh-Boong (Dept. of Mechanical Engineering, Pukyong Nat'l Univ.) ;
  • Kim, Jeong-Soo (Dept. of Mechanical Engineering, Pukyong Nat'l Univ.)
  • 윤성환 (부경대학교 에너지시스템공학과) ;
  • 박정 (부경대학교 기계공학과) ;
  • 권오붕 (부경대학교 기계공학과) ;
  • 김정수 (부경대학교 기계공학과)
  • Received : 2010.04.07
  • Accepted : 2010.06.07
  • Published : 2010.07.01
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Abstract

The characteristics of lifted butane flames diluted with nitrogen have been investigated experimentally in order to elucidate the mechanism of individual flame oscillation modes. Flame oscillations in laminar free-jet lift-off flames are classified into the following five regimes: a stabilized lift-off regime (I), a heat-loss-induced oscillation (II), a buoyancy-induced oscillation along with a heat-loss-induced oscillation (III), a combined form of an oscillation prior to blow-out and a heat-loss-induced oscillation (IV), and a combination of an oscillation prior to blow-out and a buoyancy-induced oscillation along with a heat-loss-induced oscillation (V). The characterization of the individual flame oscillations modes are presented and discussed using Strouhal numbers and their relevant parameters by the analysis of the power spectrum for temporal variation of the lift-off height.

질소로 희석된 부탄 층류 부상 화염에서 발생할 수 있는 화염진동 메커니즘을 살펴보기 위하여 실험적 연구를 수행하였다. 화염 진동은 층류 자유제트 부상 화염에서 5가지 영역으로 구분되었다: 화염 안정화 영역 (I), 열손실에 의한 진동 (II), 열손실에 의한 진동과 부력에 의한 진동이 혼재된 영역 (III),열손실에 의한 진동과 화염날림 직전의 진동이 혼재된 영역 (IV), 그리고 열손실에 의한 진동, 부력에 의한 진동 및 화염날림 직전의 진동이 모두 혼재된 영역(V). 각각의 화염진동의 특성을 규명하기 위해 화염의 시간에 따른 부상 높이 변화에 대한 FFT분석을 수행하였고 각 영역에 관련된 무차원 변수와 스트라훌 수의 조합으로 특성화 작업을 수행하였다.

Keywords

References

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