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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/>
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.