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논문 기본 정보

자료유형
학술대회자료
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한국연소학회 KOSCO SYMPOSIUM 논문집 2009년도 한국연소학회 제39회 추계학술대회 KOSCO SYMPOSIUM 논문집
발행연도
2009.11
수록면
231 - 239 (9page)

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Experiments in premixed C₂H₄/CO₂-O₂ flames (Le < 1) in a tube have been conducted, the mixture was ignited at the top, open end of and propagating downwardly toward the closed end. to investigate the exact motion of flame tip fluctuations at the initial moment of irradiating CO₂ laser, the completely flat flame front is selected as a default flame, which is corresponding to the primary acoustic instability as reported by Searby.[1] During the laser exposure to the unburned mixture, the flame fronts had extremely unstable behaviors, resulting in a strong turbulent flame eventually through the secondary acoustic instability. To elucidate the effect of flame curvatures, the flame velocity and curvature prior to the secondary acoustic instability were analyzed by using captured high speed camera images. the results showed that a sudden acceleration at advancing waves was observed. And then, there was the time lag between the flame velocity and curvature, indicating the increase in the flame velocity even with decreasing flame curvature. these behaviors are closely relevant not only to the diffusive-thermal effects but also to the acoustic waves. the plausible mechanism was proposed in this paper based on the acoustic influence.

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