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자료유형
학술저널
저자정보
오정석 (서울대학교) 윤영빈
저널정보
대한기계학회 대한기계학회 논문집 B권 대한기계학회논문집 B권 제33권 제7호
발행연도
2009.7
수록면
477 - 485 (9page)

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The study of nitrogen dilution effect on the flame stability was experimentally investigated in a non-premixed turbulent lifted hydrogen jet with coaxial air. Hydrogen gas was used as a fuel and coaxial air was used to make flame liftoff. Each of hydrogen and air were injected through axisymetric inner and outer nozzles (d<SUB>F</SUB>=3.65 ㎜ and d<SUB>A</SUB>=14.1 ㎜). And both fuel jet and coaxial air velocity were fixed as uF=200 ㎧s and uA=16 ㎧, while the mole fraction of nitrogen diluents gas was varied from 0.0 to 0.2 with 0.1 step. For the analysis of flame structure and the flame stabilization mechanism, the simultaneous measurement of PIV/OH PLIF laser diagnostics had been performed. The stabilization point was selected in the most upstream region of the flame base and defined as the point where the turbulent flame propagation velocity was equal to the axial component of local flow velocity. We found that the turbulent flame propagation velocity increased with the decrease of nitrogen mole fraction. We concluded that the turbulent flame propagation velocity was expressed as a function of turbulent intensity and axial strain rate, even though nitrogen diluents mole fraction was changed.

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