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윤진한(Jin-Han Yoon),차형우(Hyeong-Woo Cha),이만섭(Man-Seop Lee),조영창(Young-Chang Cho) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
A novel AC-DC switching technology is suggested without inductors for one-chip semiconductor. The suggested converter consists of a rectifier diodes, AC source level detector, switching control, detector of over-current and voltage, feedback controller and switching block, The key technology of the proposed AC-DC converting methode is detecting of the low level voltage for AC voltage, power control transistor and rectifying of DC level. The measurement results with commercial devices show that the converter has power efficiency of 66.5% for DC 12V 0.24A and the standby power is 49.58㎽ at AC 110V.
윤성환(Sung Hwan Yoon),박정(Jeong Park),권오붕(Oh Boong Kwon),윤진한(Jin Han Yun),길상인(Sang In Keel) 한국연소학회 2008 KOSCOSYMPOSIUM논문집 Vol.- No.-
Experimental study is conducted to grasp effects of flame curvature on flame behavior in laminar lifted-jet flames. Nozzle diameters of 0.1 and 1.0㎜ are used to vary flame curvature of edge flame. Particularly lifted-flame height with the burner diameter of 1.0㎜ is quite different from that with jet similarity solution considering virtual origin. As a result the importance of curvature effects are recognized that there exist three types of edge flame oscillation. These edge flame oscillations are caused by radial conduction heat loss even at fuel Lewis numbers less than unity, by fuel Lewis numbers near or larger than unity with the help of appreciable radial conduction heat loss, and by buoyancy effects. These are confirmed by the analysis of oscillating frequencies.
윤성환(Sung Hwan Yoon),박정(Jeong Park),권오붕(Oh Boong Kwon),윤진한(Jin Han Yun),길상인(Sang In Keel) 한국연소학회 2009 한국연소학회지 Vol.14 No.1
Experiment is conducted to grasp effects of flame curvature on flame behavior in laminar lifted-jet flames. Nozzle diameters of 0.1 and 1.0㎜ are used to vary flame curvature of edge flame. There exist three types of edge flame oscillation. These edge flame oscillations may be caused by radial heat loss at all flame conditions, by fuel Lewis numbers near or larger than unity with the help of appreciable radial conduction heat loss, and by buoyancy effects. These are confirmed by the analysis of oscillation frequencies. It is however seen that the change of lift-off height through edge-flame oscillation is mainly due to radial heat loss irrespective of Lewis number and buoyancy.
직류 전기장을 인가한 층류부착화염에서 물질-열 확산 및 부력에 의한 화염진동 비교에 관한 연구
한종규(Jong Kyu Han),윤성환(Sung Hwan Yoon),박정(Jeong Park),김정수,윤진한(Jin Han Yun),길상인(Sang In Keel),김영주(Young Ju Kim) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.42
In this paper, we describe the behavior of two self-excitations in laminar attached free-jet flames under the influence of DC electric fields, one of buoyancy-driven and the other of diffusion-thermal instability, established from the horizontal and vertical injections. In the horizontal injection with removed buoyancy effect, oscillating flames with the frequency of 1.3?7.4 ㎐ were observed at flame conditions with Lewis number more than unity. On the other hand, Lewis-number-induced self-excitation as well as buoyancy-driven self-excitation appeared in the vertical upward injection with DC electric fields. The buoyancy-induced self-excitation frequency was in range of 1.6 - 9.4 ㎐. The characteristics of the two self-excitations with similar frequency ranges is discussed.
층류제트 부상화염에서 열손실에 의한 자기진동에 관한 연구
윤성환(Sung Hwan Yoon),박정(Jeong Park),권오붕(Oh Boong Kwon),김정수(Jeong Soo Kim),배대석(Dae Seok Bae),윤진한(Jin Han Yun),길상인(San in Keel) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.3
질소 희석된 프로판 부상화염에서 열손실에 의한 자기진동을 기초로 화염안정화선도를 도출하기 위하여 노즐직경 0.3 ㎜, 1.0 ㎜에서 실험적 연구를 수행하였다. 예혼합화염에서 확산화염으로의 전도 열손실에 의한 자기진동 및 매연 복사에 의한 자기진동을 관찰하였다. 0.1 ㎐보다 낮은 주파수 성향을 띄는 열손실에 의한 자기진동은 제안된 메커니즘에 의해 잘 묘사되었고 반면 매연복사에 의한 자기진동은 O(0.1 ㎐)의 주파수 범위를 나타내었으며 제안된 메커니즘은 항온항습실 실험을 통해 입증하였다. 질소 희석된 프로판 부상화염에서 관찰된 열손실에 의한 자기진동의 특성화는 관련된 변수 및 스트라훌 수에 의해 잘 묘사되었다. We experimentally investigated lifted propane jet flames diluted with nitrogen to obtain flame-stability maps based on heat-loss-induced self-excitation. We found that heat-loss-induced self-excitations are caused by conductive heat loss from premixed flame branches to trailing diffusion flames as well as soot radiation. The conductive-heat-loss-induced self-excitation at frequencies less than 0.1 ㎐ is explained well by a suggested mechanism, whereas the oscillation of the soot region induces a self-excitation of lift-off height of the order of 0.1 ㎐. The suggested mechanism is also verified from additive experiments in a room at constant temperature and humidity. The heat-loss-induced self-excitation is explained by the Strouhal numbers as a function of the relevant parameters.
직류 전기장을 인가한 층류부착화염에서 물질-열 확산 및 부력에 의한 화염진동 비교에 관한 연구
한종규(Jong Kyu Han),윤성환(Sung Hwan Yoon),박정(Jeong Park),윤진한(Jin Han Yun),길상인,서상일(Sang Il Seo),김영주(Young Ju Kim) 한국연소학회 2011 한국연소학회지 Vol.16 No.3
In this paper, we describe the behavior of two self-excitations in laminar attached free-jet flames under the influence of DC electric fields, one of buoyancy-driven and the other of diffusion-thermal instability, establi¬shed from the horizontal and vertical injection. In the horizontal injection with removed buoyancy effect, oscillating flames with the frequency of 1.3 - 7.4 Hz were observed in a certain condition with Lewis number more than unity. On the other hand, it was appeared Lewis number induced self-excitation as well as buoyancy-driven self-excitation in the vertical upward injection with DC electric fields. This behavior had frequency range of 1.6 - 9.4 Hz and was exhibited to attribute the buoyancy effect. Finally, a well-defined division about two self-excitations having similar frequency range is briefly discussed.