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

  • 제33권9호
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  • Pages.699-708
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  • 2009
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  • 1226-4881(pISSN)
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  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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부상된 수소 난류확산화염의 화염구조

Flame Structure of a Liftoff Non-Premixed Turbulent Hydrogen Jet with Coaxial Air

  • 오정석 (서울대학교 대학원 기계항공공학부) ;
  • 윤영빈 (서울대학교 기계항공공학부)
  • 발행 : 2009.09.01
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초록

To understand hydrogen jet liftoff height, the stabilization mechanism of turbulent lifted jet flames under non-premixed conditions was studied. The objectives were to determine flame stability mechanisms, to analyze coexistence of two different flame structure, and to characterize the lifted jet at the flame stabilization point. Hydrogen flow velocity varied from 100 to 300 m/s. Coaxial air velocity was changed from 12 to 20 m/s. Simultaneous velocity field and reaction zone measurements used, PIV/OH PLIF techniques with Nd:YAG lasers and CCD/ICCD cameras. Liftoff height decreased with the increase of fuel velocity. The flame stabilized in a lower velocity region next to the faster fuel jet due to the mixing effects of the coaxial air flow. The flame stabilization was related to turbulent intensity and strain rate assuming that combustion occurs where local flow velocity and turbulent flame propagation velocity are balanced. At the flame base, two different flame structures were found that was the partial premixed flames and premixed flame.

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참고문헌

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