한국연소학회:학술대회논문집

The Korean Society of Combustion (한국연소학회)
권호 표지

Characteristics of Partially Premixed Flames in Double Concentric Burner

이중 동축류 버너에서 부분예혼합화염의 특성에 관한 연구

  • Kwon, S.J. (Department of Mechanical Engineering, Seoul National University) ;
  • Cha, M.S. (Department of Mechanical Engineering, Seoul National University) ;
  • Chung, S.H. (Department of Mechanical Engineering, Seoul National University)
  • 권성준 (서울대학교 기계공학과) ;
  • 차민석 (서울대학교 기계공학과) ;
  • 정석호 (서울대학교 기계공학과)
  • Published : 1998.10.09
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Abstract

Flame characteristics in a double concentric burner has been studied experimentally. Air is supplied through a central nozzle, methane/air premixture is supplied in a inner annular part, and coflowing shield air is supplied to minimize outside disturbances. Depending on flow rate and concentration, various flame shapes can be observed. As the flow rate difference between central air jet and annular premixed jet is varied, several distinctive flames are observed. Conditions of partially premixed flames are further investigated; nozzle attached rich premixed flame, inner lifted flame, and outer lifted flame. Using the Abel transformation of digitized images of flames, cross- sectional images of flames can be obtained, from which overall structure of flames can be identified. PLIF measurement of OR radical was also conducted. OR radicals were mainly distributed in diffusion flame region. From the difference of OR distribution between nozzle attached and lifted flames, similarity of OR distribution between tribrachial flame and lifted flames in this study are observed.

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