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파일롯 화염에 의해 고정된 관내 예혼합 화염에 대한 실험적 연구
곽영태(Young Tae Guahk),오광철(Kwang Chul Oh),신현동(Hyun Dong Shin) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
Lean laminar premixed propane and methane flames which were anchored by a hydrogen-pilot flame in a tube were<br/> investigated experimentally. The different flame shapes were observed by varying mean velocity from 10 to<br/> 200cm/s(Re=339~6772) and equivalence ratio from 0.45 to 0.7. The flame shape was observed by a ICCD camera and a<br/> high speed camera. It was possible to draw stability diagram for propane and methane flames. And the Le number effect<br/> on the behavior of the flame was investigated in the stability diagram for propane and methane flames. The stability<br/> diagram consists of flashback region, tail-out region, stable region and vibrating region.<br/> The He-Ne laser and the PMT were used for measuring the frequency of vibrating flame and the Ar-Ion laser and<br/> alumina particles were used for observing the flow streamline before the flame front.
관내 프로판/공기와 메탄/공기 화염의 펄럭임 현상에 대한 연구
곽영태(Young Tae Guahk),이대근(Dae Keun Lee),오광철(Kwang Chul Oh),신현동(Hyun Dong Shin) 한국연소학회 2006 KOSCOSYMPOSIUM논문집 Vol.- No.-
Flickering behaviors of lean premixed flame of propane/air and methane/air flame anchored by a pilot flame in a tube were investigated. Unsteady behaviors of the flame were monitored by a high speed ICCD camera and the flickering frequency was defined as the number of flame curvatures passing a fixed spatial point in a second. Unlike previous studies in which flames are in open condition so that the flickering mechanism is an unstable interaction of hot buoyant products with the ambient air, flames in this study are surrounded by a tube which means they are not open to ambient air, so that there is no interaction between hot buoyant products and ambient air. Despite the fact, there exists flickering phenomena and the flickering frequency ranges from 10 ㎐ to 50 ㎐ which is wider compared to previous studies. We relate the flickering mechanism to flame-generated vorticity and analytic solution for locally approximated flow is used. As a result, the relationship between flickering wavelength and dimensionless vorticity is acquired and the cause of higher range of flickering frequency is explained.