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최동석(D.S.Choi),김덕줄(D.J.Kim),오승묵(S.M.Oh),황의상(E.S.Hwang),정용일(Y.I.Jeong) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
The OH molecule is a highly reactive combustion intermediate and relatively abundant in combustion systems. It also has the availability of convenient UV -laser systems to excite the A²Σ-X²?? electronic transition. The spectroscopic parameters describing this transition are well known. In this research, the OH molecule was measured in the laminar flame burner and constant volume combustion chamber(CVCC) in order to use it as the fundamental data for studying combustion phenomena. The LIF images of the OH molecule in the laminar 리ame burner were caught by using KrF excimer laser and ICCD camera. The natural fluorescence<br/> of OH was also measured by the interference filter(310 nm) and spectrometer in the CVCC at different equivalence ratios.
김종률(J.-R. Kim),최경민(G.-M. Choi),김덕줄(D.-J. Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
Recently, development of flame control scheme has been hot issues in the combustion engineering. It has been held that flame shape can be controllable by pressure inside combustor. The influence of combustor atmospheric pressure on flame shape was investigated in the present study. The flame shape, flammable limit, flame temperature and nitric oxide emission were measured as functions of combustor atmospheric pressure and equivalence ratio. The reaction region became longer and wider with decreasing combustor atmospheric pressure by direct photography, hence reduction of blow off limit. This tendency was also observed in the mean flame temperature distribution. Nitric oxide emission decreased with decreasing combustor atmospheric pressure. Low NOx combustion is ascribed to wide-spread reaction region in the low atmospheric pressure condition. These results demonstrate that flame shape and nitric oxide emission can be controllable with combustor atmospheric pressure.
노즐 내부 스월러각과 스월실 형상비 변화가 분무특성에 미치는 영향
김영진 ( Y. J. Kim ),정홍철 ( H. C. Jung ),정지원 ( J. W. Jung ),김덕줄 ( D. J. Kim ) 한국분무공학회 2003 한국액체미립화학회지 Vol.8 No.4
N/A The Objective of this study is to investigate the effect of internal swirler angle and swirl chamber aspect ratio of nozzle on spray characteristics for application of spray system in micro fabrication process. The macro-spray characterictics such as the spray angle and breakup process were obtained by photographs illustrating atomization. The micro-spray characteristics such as droplet size and axial velocity were measured by using PDA with swirler angle and swirl chamber aspect ratio. The swirler angles were 13.5°, 27°, and 40.5°. The swirl chamber aspect ratios were 1.2, 1.6, and 2.0. It was found that the smaller swirl chamber aspect ratio was, the larger axial velocity and drop size were.
Full Cone Type 스월노즐에서 단일분무와 이중분무의 중첩영역에 대한 충격력 평가
김태현 ( T. H. Kim ),성연모 ( Y. M. Sung ),정흥철 ( H. C. Jeong ),김덕줄 ( D. J. Kim ),최경민 ( G. M. Choi ) 한국분무공학회 2011 한국액체미립화학회지 Vol.16 No.1
The impact force on the single and overlap region of twin spray was experimentally evaluated using visualization method in full cone type swirl nozzle spray. Visualization of spray was conducted to obtain the spray angle and breakup process. The photography/imaging technique, based on Particle Image Velocimetry (PIV) using high-speed camera, was adopted for the direct observation of droplet motion and axial velocity measurement, respectively. Droplet size was measured by Particle Motion Analyze System (PMAS). The purpose of this study is to provide fundamental information of spray characteristics, such as impact force, for higher etching factor in the practical wet etching system. It was found that the spray angle, axial velocity and impact force were increased with increasing the nozzle pressure while droplet size decreased with increasing the nozzle pressure. Droplet size increased as the distance from nozzle tip was decreased. The impact force of twin spray in the overlap region was about 63.29, 67.02, 52.41% higher than that of single spray at 40, 50 and 60 mm of nozzle pitch, respectively. Also, the nozzle pitch was one of the important factors in the twin spray characteristics.
4밸브 디젤엔진의 스월형 흡기포트 구조 차이에 따른 정상상태 유동 특성연구
조래희(L.H.CHO),김덕줄(D.J.KIM),정동수(D.S.JEONG),우석근(S.K.WOO) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2
It has been known that the in-cylinder mixture flow motion has a dominent effect on combustion and the concept of swirl has been exploited for decades to enhance combustion in gasoline and diesel engine. In this study, the influence of inlet port geometry on swirl intensity has been investigated in swirl type 4-valve diesel engine under steady flow condition.<br/>
보염기 형상에 따른 연료액적분포와 연소특성에 관한 실험적 연구
황상호 ( S. H. Hwang ),김덕줄 ( D. J. Kim ) 한국분무공학회 2004 한국액체미립화학회지 Vol.9 No.2
N/A This work was performed to investigate the distribution of the fuel droplet size around the bluff-body and the combustion characteristics. The geometry of the bluff-body influenced the spray shape and the combustion characteristics. Diameters of the bluff-body in this experiment are 6, 8, and 10 ㎜ and the impingement angles( 9) are 30°, 60°, and 90°. The measurement points were at the distances of 20 and 30 ㎜ axially from the nozzle. The SMD and Rosin-Rammler distribution was acquired by image processing technique (PMAS), and the mean temperatures were measured by thermocouple. The results obtained are as follows; In the condition of θ= 60°, the values of SMD are not greatly varied compared to the other conditions. As the impingement angle of bluff-body was increased, the high temperature region was wider along radial direction. When the air-fuel ratio was increased, the CO concentration was decreased.