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이기백,나종문,김정훈,Lee, Ki-Baik,Na, Jong-Moon,Kim, Jeong-Hun 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.10
In this paper, the propagation of elastic wave generated by loading impact to plates made of isotropic of anisotropic material was studied. And the influence of boundary conditions (free or clamped edge) upon the reflection of elastic wave was anlyzed. Also, double exposure holographic interferometer using ruby pulse laser was formed in order to investigate transient waves. Before the elasitc wave was reflected from the edges, the elastic wave of isotropic plate such as aluminum plate showed circular interferometric fringe pattern, whereas that of anisotropic plate such as epoxy composite laminates showed elliptical one. And the transverse displacement curves obtained from experiment and theory for both plates agreed well. Also, the waves reflected from the boundary edges showed much differences according to the boundary condition of edges.
난류 분류형 미분탄 화염에서의 초저급탄 혼합연소 특성 관찰
문철언(Cheor-Eon Moon),성연모(Yon-Mo Sung),안성율(Seong-Yool Ahn),나종문(Jong-Moon Na),김덕줄(Duck-Jool Kim),최경민(Gyung-Min Choi) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.43
This paper investigated ignition behavior and combustion characteristics in terms of coal blends including Indonesian ultra low rank coal that were fired in a lab-scale slit burner system. The first part of this paper estimated ignition time and combustion region using flame images and CH<SUP>*</SUP> chemiluminescence intensity. The result showed variation of ignition time and combustion region with coals and their blends. Ignition time was influenced by moisture content and ignition time got faster with decreasing moisture contents in coal particles. Combustion region was divided into three regions with CH<SUP>*</SUP> intensity. In case of the blends, even though particle preheating region increased by moisture contents, overall combustion region except char reaction shorten due to the influence of volatile reaction in a bituminous coal. The second part of this study carried out experimental researches on mean flame temperature and OH<SUP>*</SUP>, CH<SUP>*</SUP> and C2<SUP>*</SUP> chemiluminescence intensity distribution. The mean flame temperature increased along with combustion reaction, and C2<SUP>*</SUP>/CH<SUP>*</SUP> in the blends decreased little more than bituminous’ one because of reduced fixed carbon contents from the blends induced by a decrease in unburned carbon contents of a bituminous coal
순산소 연소조건에서 연소가스 재순환이 NO 생성에 미치는 영향
고선미(Sun-Mi Go),나종문(Jong-Moon Na),서상일,김태형,최경민(Gyung-Min Choi),김덕줄(Duck-Jool Kim) 한국연소학회 2008 KOSCOSYMPOSIUM논문집 Vol.- No.-
Characteristics of nitric oxide (NO) production in coal-air(N₂/O₂)/oxy-fuel(CO₂/O₂) counterflow flames have been computationally studied with detailed chemistry and transport properties. The preheated air in coal combustion using the N₂/O₂ mixture gas cause a significant increase of nitric oxide emission due to higher temperature. The nitric oxide emission can be reduced efficiently by using CO₂/O₂ mixture gas instead of N₂/O₂ mixture gas. By combustion process, NO production was analyzed in detail with considering NO mechanisms which are thermal NO, fuel NO and prompt NO production. In order to understanding of the reaction paths of NO production and destruction correctly, overall reaction paths of respective NO mole fraction were described. In condition of CO₂/O₂ mixture gas, NO decomposition was observed for flue gas recirculation. The effect of detailed NO mechanism and fuel-N characteristics at flue gas recirculation were discussed.
스월화염에서 연소실 압력 변동에 의한 국소 반응강도의 특성
노영구(Young-Gu Noh),김종률(Jong-Ryul Kim),김태형(Tae-Hyung Kim),서상일(Sang-Il Seo),김성철(Sung-Chul Kim),나종문(Jong-Moon Na),최경민(Gyung-Min Choi),김덕줄(Duck-Jool Kim) 한국연소학회 2009 한국연소학회지 Vol.14 No.4
An experimental study was performed to confirm the effect of the changing combustor pressure(-30~30 kpa), combustion characteristics were investigated by measuring the local chemiluminescence intensity, the local temperature distribution and emission. In order to investigate combustion ones, the combustor pressure index(P<SUP>*</SUP>) was controlled in the range of 0.7~1.3 for each equivalence ratio in the present combustion system, where P<SUP>*</SUP> is defined as the ratio of absolute pressure to atmospheric one. The local mean temperature showed the uniform distributions for lower pressure index, which increased with increasing equivalence ratio. The mean OH* chemiluminescence intensity, showed high level for lower pressure index for Φ≥1.0 conditions. EINOx decreased with decreasing pressure index for overall equivalence ratio conditions.
노영구(Young-Gu Noh),김종률(Jong-Ryul Kim),김태형(Tae-Hyung Kim),서상일(Sang-Il Seo),김성철(Sung-Chul Kim),나종문(Jong-Moon Na),최경민(Gyung-Min Choi),김덕줄(Duck-Jool Kim) 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.39
An experimental study was performed to investigated the effect of the changing combustor pressure(-30㎪ ~ 30㎪), combustion characteristics were investigated by comparison between the local chemiluminescence intensity and the local temperature distribution of CH₄, C₂H₄ and C₃H?. The our previous experimental works, we can see the activity combustion for lower pressure than atmospheric condition about CH₄. In present study, the local mean temperature showed the uniform distributions for lower pressure index, Ф=1.2. C₂ <SUP>*</SUP>/CH<SUP>*</SUP> intensity ratio, also showed high level for one. EINOx decreased with decreasing pressure index for all fuels. However, C₂H₄ shows other characteristics by diffusion coefficient and burning velocity, which indicates higher effect of burning velocity than changing combustor pressure.
손제하(Je-ha Son),Ma Haiquan,나종문(Jong-moon Na),최경민(Gyung-min Choi),김덕줄(Duck-jool Kim) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.43
The research was conducted at LNG to investigate exhaust characteristic and reduction of CO emission by using multi-air combustion with changing flow rate. Mean temperature of exhaust gas was increased with increasing fuel flow rate and decreasing air fuel flow rate. CO emission was increased with increasing flow rates. It was decreased by using multi-air combustion because unburned gas was re-burned with added fresh air at combustor. The reduction of CO emission was more effective when injection point of air was at the downstream of flame. In case of multi-air combustion, distribution tendency of flame temperature was divided into two parts, dilution area and re-burning area.
연소기 압력변동조건하에서 2차연료분사가 화염안정화 및 배출특성에 미치는 영향
노영구(Young-Gu Noh),김종률(Jong-Ryul Kim),나종문(Jong-Moon Na),최경민(Gyung-Min Choi),김덕줄(Duck-Jool Kim) 한국연소학회 2008 KOSCOSYMPOSIUM논문집 Vol.- No.-
An experimental study was preformed to investigated the effect of secondary fuel injection, varying the changing combustor pressure from -30 ~ 30 ㎪ on flame stabilization and emission characteristic in the swirl-stabilized flame. In order to investigate. combustion characteristics, the combustor pressure index(P<SUP>*</SUP>) was controlled in the range of 0.7~1.3 for each equivalence ratio in the present combustion system, where P<SUP>*</SUP> is defined as the ratio of absolute pressure to atmospheric one. In lean conditions, R.m.s. of pressure fluctuations is increased with decreasing combustor pressure. This flame fluctuation caused incomplete combustion, hence CO emission index increased. NOx emission index decreased with decreasing pressure index for overall equivalence ratio conditions. These oscillating flames were measured by simultaneous OH<SUP>*</SUP> chemiluminescence time-series visualization and pressure fluctuation measurement.