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가솔린 엔진의 연료분사시기가 희박연소한계에 미치는 영향에 관한 연구
엄인용(I. Y. Ohm),정경석(K. S. Jeong),정인석(I. S. Jeung) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
The effects of fuel injection timing on lean misfire limit has been investigated in a sequential MPI SI engine. To investigate the interaction of injection timing and intake flow characteristics, so called axial stratification phenomena, 4 different swirl inducing intake ports have been tested in single cylinder engine test bench. And 2 kinds of fuel, gasoline and compressed natural gas(CNG), were used to see the effect of liquid fuel vaparization. Result shows that the combination of port swirl ratios and injecton timimg governs the lean misfire limit and lean misfire limit envelopes reamain alomost same for a given swirl ratios regardless of engine speed. It is also found that two phase flow has some effects on lean misfire limit ,i.e. axial stratification.<br/>
DES를 이용한 초음속 유동내 수직 연료분사 유동의 비정상 3차원 해석
원수희(S.H. Won),문성영(S.Y. Moon),정인석(I.S Jeung),최정열(J.Y. Choi) 한국전산유체공학회 2008 한국전산유체공학회 학술대회논문집 Vol.2008 No.-
Unsteady three-dimensional flowfields generated by transverse fuel injection into a supersonic mainstream are simulated with a DES turbulence model. Comparisons are made with experimental results in term of the temporal eddy position and eddy formation frequency. The vorticity field around the jet exit is also analyzed to understand the formation mechanism of the jet vortical structures. Results indicate that the DES model correctly predicts the convection characteristics of the large scale eddies. However, it is also observed that the numerical results slightly overpredict the eddy formation frequency. The jet vortical structures are developed from the competing vortices in the recirculation region of upstream boundary.