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

The Korean Society of Mechanical Engineers (대한기계학회)
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Study of Hydrogen Turbulent Non-premixed Flame Stabilization in Coaxial Air Flow

동축공기 수소 난류확산화염에서의 화염안정성에 대한 실험적 연구

  • 오정석 (서울대학교 대학원 기계항공공학부) ;
  • 김문기 (서울대학교 대학원 기계항공공학부) ;
  • 최영일 (서울대학교 대학원 기계항공공학부) ;
  • 윤영빈 (서울대학교 기계항공공학부)
  • Published : 2008.03.01
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Abstract

It was experimentally studied that the stabilization mechanism of turbulent, lifted jet flames in a non-premixed condition to reveal the newly found liftoff height behavior of hydrogen jet. The objectives are to report the phenomenon of a liftoff height decreasing as increasing fuel velocity, to analyse the flame structure and behavior of the lifted jet, and to explain the mechanisms of flame stability in hydrogen turbulent non-premixed jet flames. The hydrogen jet velocity was changed from 100 to 300m/s and a coaxial air velocity was fixed at 16m/s with a coflow air less than 0.1m/s. For the simultaneous measurement of velocity field and reaction zone, PIV and OH PLIF technique was used with two Nd:Yag lasers and CCD cameras. As a result, it was found that the stabilization of lifted hydrogen diffusion flames is correlated with a turbulent intensity and Karlovitz number.

Keywords

References

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