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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/>
최동석,류경훈,차건종,김덕줄,Choi, Dong-Seok,Ryu, Kyung-Hoon,Cha, Keun-Jong,Kim, Duck-Jool 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.10
High-pressure swirl injectors have usually been employed in Gasoline direct injection engines due to their spray characteristics and the feasibility of their control. Thus the microscopic characteristics of high-pressure swirl spray were investigated by PDA. The correlation between axial and radial velocities and the correlation between droplet size and axial velocity were examined with different axial and radial positions. Two dimensional droplet velocity and its number distribution with size-classified droplets were illustrated. The mean droplet velocity and its SMD were also analyzed at the center of spray, the position having maximum mean axial velocity, and the spray periphery using time dividing method. Finally, the structure of high-pressure swirl spray was presented with the size distribution and velocity profile of droplets.
김한재(Han-jae Kim),류경훈(Kyeong-hun Ryu),최동석(Dong-seok Choi),김덕줄(Duck-jool Kim) 한국자동차공학회 2000 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
Behaviors of GDI spray for flow and non-flow field were studied using LIEF and PDPA system. Injector has cone spray angle and spray has hollow cone structure. The exciplex system of fluorobenzene and DEMA in a non-fluorescing base fuel of hexane was employed. Droplet size and velocity were also measured by PDPA. From spray images ,sprays could be divided as two regions: cone and mixing region. Large droplets over 40㎛ were distributed outside spray main stream and many fine droplets were distributed inside the spray and vortex region. In engine spray has smaller penetration than chamber while dispersions were almost same at both cases. At mixing region, area ratios of high intensity region in engine were larger and increased rapidly after about 1.0ms after injection.<br/>