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학술대회자료
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대한기계학회 대한기계학회 춘추학술대회 대한기계학회 2006년도 춘계학술대회 강연 및 논문 초록집
발행연도
2006.6
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1,915 - 1,920 (6page)

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The effects of fuel dilution on the lift-off characteristics of triple flames were studied experimentally using a multi-slot burner, which can stabilize the lift-off flame especially at weak fuel concentration gradients. Contribution of diffusion branch to the propagation velocity of triple flame was examined by employing three kinds of fuel compositions diluted by nitrogen (0%, 25%, 50% N2). Lift-off height, axial velocity variation, and OH radical are measured by various laser diagnostic methods (ICCD camera, PIV system, OH-LIF etc.). Fuel dilution reduced the propagation velocity of triple flame mainly due to the decrease of flame temperature in premixed branch, and resulted in a significant change in flame stabilization conditions. OH radical in the diffusion branch is not clearly observed behind the premixed branches at very weak fuel concentration gradient, but becomes prominently active at the specific fuel concentration gradient. Despite the difference in fuel dilution, lift-off heights of triple flame have minimum value during the increase of fuel concentration gradient resulting in U-shaped trends. This fact means that the propagation velocity has a maximum value at a specific fuel concentration gradient regardless of the fuel dilution even though the critical concentration gradient varies. The enhancement of the OH radicals near the maximum propagation velocity was more clearly detected in higher dilution case. Thus the effect of the diffusion flame on the propagation velocity of triple flame needs to be reconsidered.

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3. 결과 및 고찰

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