한국연소학회:학술대회논문집
- 한국연소학회 2006년도 제33회 KOSCO SYMPOSIUM 논문집
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- Pages.73-78
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- 2006
역확산화염에서 부상 상태의 진동현상에 관한 연구
The Periodic Motion of Lifted Flames in Inverse Coflow Jets
- 발행 : 2006.10.20
초록
The lifted oscillating flame has been studied using experiments of inverse diffusion flames that the air jet injected into a methane background. To find out the characteristics of inverse diffusion flames, fundamentally flame stabilized diagram is investigated with various air and fuel jet velocities. It has five regions - flame extinction, stable attached flame, anchored flame, liftoff flame and blow off region. In inverse diffusion flame, lifted flames were observed near the blow off region. As long as flames lift off, flames oscillate by periods. In this oscillating lifted flame region, the frequency of 1 and under were observed in various air and methane jet velocities. Characteristics of lifted flames are also examined by using the ICCD direct image. And intensity of flame chemiluminescence is very different in rising and falling period from photographs. For the present, it is predicted that the changes of flame structure are related with flame oscillation, but more experiments will be needed to make clear the phenomenon.