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MPI인젝터의 분무 특성에 따른 벽류 생성 및 분포에 관한 연구
이기형(K. H. Lee),이창식(C. S. Lee),김봉규(B. K. Kim) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
In the case that EGI system is applied, air-fuel mixing period is so short that a lot of fuel-film and liquid-fuel flow into cylinder. Since this fuel-film is not burnt in cylinder, it is exhausted in the form of HC emission. In. this paper, fuel-film measuring device is manufactured specially, the amount and distribution of fuel-film which flows into through valve, can be measured quantitatively using this device. And, with the spark plug in which optical fiber inserted, diffusion flame is observed at second hand. As the result of this experiment, the information of optimal spray characteristics and injection condition that minimize fuel-film development, can be built up.<br/>
이기형(K.H. Lee),이창식(C.S. Lee),전문수(M.S. Chon),김윤희(Y.H. Kim) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_2
To overcome the restriction of hazardous exhaust gas emissions and to achieve the lower fuel consumption, MPI engine will be increased world-widely. Even though EGI system of MPI engine supplies the same amount of fuel to each cylinder. the difference of the air amount which flows into each cylinder make it hard to control air-fuel ratio precisely. In particular. the plenum chamber configuration may have profound effects on the uniformity of air-fuel ratio each cylinder. Thus it is need to understand the flow characteristics in the plenum chamber. In this paper. the flow in the plenum chamber was visualized and measured using a laser sheet visualization method and a PTV method respectively. The results show that the complex flow in the plenum chamber is influenced by plenum chamber configurations, suction flow rates, crank speeds and so on.<br/>
MPI 가솔린 기관의 분무 및 벽류 거동 특성에 관한 연구
이기형(K.H.Lee),이창식(C.S.Lee),신민규(M.K.Shin),김봉규(B.K.Kim) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2
Mixture formation is affected by spray characteristics of injector and wall film flow. In this paper, spray characteristics such as size distribution, SMD, spray angle and velocity of three type injectors which have different spray patterns are measured by PMAS. Wall film flow rate of intake port are measured. From these experiments, the fuel behavior of three type injectors such as injection direction, spray angle and wall film flow is made clear. Consequently, the optimal fuel injection system and conditions for reducing spray size and minimizing the wall fuel film are found through this research.<br/>
이기형(K.H. Lee),이창식(C.S. Lee),김봉규(B.K. Kim),서영호(Y.H. Seo) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_1
Mixture formation is one of the important factors to improve combustion performance of an spark ignition engine. This is affected by spray and atomization characteristics of injector. In this paper, spray characteristics such as size distributions, SMD, spray angle, and velosity are measured by PMAS. Atomization levels are investigated with developed various air-assisted injectors. From these experiments, spray patterns and atomization characteristics injected from MPI injector are made clear. And these results revealed a design guide for air-assisted injector.
이색 PIV 기술을 이용한 가솔린 엔진 연소실내의 유동특성에 관한 연구
이기형(K.H.Lee),오승익(S.I.Oh),이현직(H.J.Lee),정재훈(J.H.Chung),주영철(Y.C.Ju) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
It has been known that the in-cylinder flow field structure at ignition timing has an effect on the shape of initial flame. The particle image velocimetry(PIV), a planar measuring technique, is an efficient tool for studying the complicated flow field such as in-cylinder flow and intake port flow.<br/> In this study, two-color scanning PIV is designed to obtain quasi-instantaneous two-dimensional velocity data by using a rotating mirror and a beam splitter. This PIV allows the complex turbulent flow and vorticity including countercurrent like tumbling flow by using spatial filtering technique. In addition, high spatial resolution is adequate to resolve the few-mm turbulent integral length scales.<br/>