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

The Korean Society of Mechanical Engineers (대한기계학회)
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Study on Heat-Loss-Induced Self-Excitation in Laminar Lifted Jet Flames

층류제트 부상화염에서 열손실에 의한 자기진동에 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.) ;
  • Bae, Dae-Seok (Dept. of Mechanical Engineering, Pukyong Nat'l Univ.) ;
  • Yun, Jin-Han (Environmental & Energy Systems Research Division, Korea Institute of Machinery and Materials) ;
  • Keel, San-In (Environmental & Energy Systems Research Division, Korea Institute of Machinery and Materials)
  • 윤성환 (부경대학교 에너지시스템공학과) ;
  • 박정 (부경대학교 기계공학과) ;
  • 권오붕 (부경대학교 기계공학과) ;
  • 김정수 (부경대학교 기계공학과) ;
  • 배대석 (부경대학교 기계공학과) ;
  • 윤진한 (한국기계연구원 그린환경에너지기계연구본부) ;
  • 길상인 (한국기계연구원 그린환경에너지기계연구본부)
  • Received : 2010.11.30
  • Accepted : 2011.01.03
  • Published : 2011.03.01
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Abstract

We experimentally investigated lifted propane jet flames diluted with nitrogen to obtain flame-stability maps based on heat-loss-induced self-excitation. We found that heat-loss-induced self-excitations are caused by conductive heat loss from premixed flame branches to trailing diffusion flames as well as soot radiation. The conductive-heat-loss-induced self-excitation at frequencies less than 0.1 Hz is explained well by a suggested mechanism, whereas the oscillation of the soot region induces a self-excitation of lift-off height of the order of 0.1 Hz. The suggested mechanism is also verified from additive experiments in a room at constant temperature and humidity. The heat-loss-induced self-excitation is explained by the Strouhal numbers as a function of the relevant parameters.

질소 희석된 프로판 부상화염에서 열손실에 의한 자기진동을 기초로 화염안정화선도를 도출하기 위하여 노즐직경 0.3 mm, 1.0 mm에서 실험적 연구를 수행하였다. 예혼합화염에서 확산화염으로의 전도 열손실에 의한 자기진동 및 매연 복사에 의한 자기진동을 관찰하였다. 0.1 Hz보다 낮은 주파수 성향을 띄는 열손실에 의한 자기진동은 제안된 메커니즘에 의해 잘 묘사되었고 반면 매연복사에 의한 자기진동은 O(0.1 Hz)의 주파수 범위를 나타내었으며 제안된 메커니즘은 항온항습실 실험을 통해 입증하였다. 질소 희석된 프로판 부상화염에서 관찰된 열손실에 의한 자기진동의 특성화는 관련된 변수 및 스트라훌 수에 의해 잘 묘사되었다.

Keywords

References

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