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Laser sheet 광을 이용한 디젤분무의 성장에 관한 연구
서경일(K.I.Se),천무권(M.K.Chun),차건종(K.J.Cha),김덕줄(D.J.Kim) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
Diesel engine plays an important role in heavy industry and transportation owing to its high thermal efficiency compared with others. But, because these engines are producing pollution substances such as Soo, NOx, etc., air pollution is especially serious in industrial area and urban area. So recent major research and development studies in diesel engines are changing toward point to purify the polluted environment In diesel engines, the geometric structure of nozzle and the microscopic and macroscopic mixing processes between the injected fuel and the ambient gas have a great influence on the formation of Soot and NOx emissions. In this study, the inner microscopic structure and growth process of a non-evaporating diesel spray at different injection pressures and ambient pressures were investigated using laser sheet beam. These results were compared with those of impinged spray that is briskly studied now as a manner to decrease the exhaust emissions under the same conditions.
위상 도플러 법을 이용한 직분식 가솔린엔진용 와류형 고압 인젝터의 분무 특성에 관한 연구
류경훈(K.H.Ryu),정지원(J.W.Jung),최동석(D.S.Choi),차건종(K.J.Cha),김덕줄(D.J.Kim),주영철(Y.C.Joo) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
Gasoline direct injection engines have been studied to improve engine efficiency and to reduce emission. Spray characteristics of an injector have an important effect on engine efficiency and emission. Thus the purpose of this study is to provide the fundamental data for injector design which is investigated on the spray characteristics of high pressure swirl injector for GDI engine. In this paper, PDA was utilized for the measurement of mean velocity of droplets. Measurement field was from 10mm below nozzle tip to 100mm in axial direction and 20mm in radial direction. The results are presented by the vector to illustrate the magnitude and direction of velocity at each position. The spray images were also utilized to make the measurement position<br/>
직분식 가솔린엔진용 스월형 고압 인젝터의 분무의 성장거동에 관한 연구
천무권(M.K.Chun),박봉우(B.W.Park),최동석(D.S.Choi),차건종(K.J.Cha),김덕줄(D.J.KIm),주영철(Y.C.Joo) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
The mixture formation process of gasoline direct-injection(GDI) engines is quite complex and the requirement on the spray quality changes with the combustion system. The initial spray of high pressure swirl injector was studied using shadowgraph technique by multi-frame camera. The cross section of this spray was visualized using two-dimensional laser Mie scattering technique. The effects of fuel injection pressure. injection duration. and ambient pressure on the spray breakup were studied. Both the spray tip penetration and effect of swirl on the spray were increased with an increase in fuel injection pressure. With an increase in the ambient pressure. both the spray tip penetration and the spray width decreased. The structure of cross section of this spray had the circumferential distribution with an hollow part.<br/>
황순철 ( S. C. Hwang ),최동석 ( D. S. Choi ),차건종 ( K. J. Cha ),김덕줄 ( D. J. Kim ) 한국분무공학회 1999 한국액체미립화학회지 Vol.4 No.4
The concentration and spatial distribution of vapor phases in DI (Direct Injection) gasoline spray were measured quantitatively by exciplex fluorescence method. Fluorobenzene and DEMA (diethylmethylamine) in a solution of hexane were used as the exciplex-forming dopants. The fluorescence intensity of vapor phase were obtained by ICCD camera with the appropriate filter The relationship between fluorescence intensity and vapor concentration was induced for the purpose of a quantitative analysis. The 2-D vapor/liquid images of fuel spray were captured under the evaporation condition, and the spatial distribution of vapor concentration was obtained. The spatial distribution of liquid phase had hollow-cone shape. And the vapor phase was widely distributed in the whole spray. The behavior of vapor phase was significantly affected by second flow such as entrainment, vortex, while that of liquid phase was scarcely affected.