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학술대회자료
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이원준 (부경대학교) 윤성환 (친환경수송시스템연구소) 박정 (부경대학교) 권오붕 (부경대학교) 윤진한 (한국기계연구원) 길상인 (한국기계연구원)
저널정보
한국연소학회 KOSCO SYMPOSIUM 논문집 2011년도 한국연소학회 제43회 추계학술대회 KOSCO SYMPOSIUM 논문집
발행연도
2011.12
수록면
237 - 245 (9page)

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The current study was motivated by reasoning why heat-loss-induced self-excitation, identified well in laminar lifted free-jet flames, has not been so far observed in lifted coflow jet flames. Concerning a well-defined heat-loss-induced self-excitation at zero coflow velocity, experiments were conducted by varying coflow velocity until heat-loss-induced self-excitation disappears. It was found that there exists a limit coflow velocity over which heat-loss-induced self-excitation does not occur, i.e, the coflow velocity 40 ㎝/s for the nozzle diameter 0.3 ㎜ in the current study. Based on this, flame stability maps were presented in the coflow velocity ranges of 10 ~ 40 ㎝/s. The functional dependency of Strouhal number upon related parameters is described for the heat-loss-induced self-excitation and discussed in detail.
An newly identified oscillating by flame extinction (mode Ⅱ) is shown to be realted to the heat-loss-induced self-excitation from premixed wings to trailing diffusion flame in the current laminar lifted coflow jet flames; meanwhile the traditional flame blow-out (mode Ⅰ) as well as the heat-loss-induced blow-out (mode Ⅱ) have been so far found in laminar lifted free jet flames. It is seen that the flame blow-out of the mode Ⅱ is delayed compared to that in laminar lifted jet flame. The oscillating by flame extinction (mode Ⅱ) is discussed in detail for the relevance with the coflow velocity.

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UCI(KEPA) : I410-ECN-0101-2013-431-003274735