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[論文] 가솔린엔진의 연소실내 유동개선에 의한 급속희박 연소효과에 관한 연구
강건용(K.Y.Kang),엄종호(J.H.Uhm),우세종(S.J.Woo),정동수(D.S.Jeong) 한국자동차공학회 1992 오토저널 Vol.14 No.3
An experimental study of in-cylinder flow and combustion characteristics in two gasoline engines of different intake ports which are denoted as original port and masked shroud head (MSH) ports is presented. The flows generated by the MSH and the original port are investigated by laser Doppler velocimeter(LDV) under steady flow and motoring (non-firing) conditions. Combustion characteristics with different swirl levels produced by two intake ports are analyzed by combustion pressure measure- ment and statistical calculation.<br/> The swirl level inside the cylinder of the MSH port engine is found to be much higher than the original port, and the MSH has a large eddy motion of cylinder diameter size. Using ensemble average method to evaluate engine turbulence under motoring condition, the MSH port engine is shown to have higher turbulence intensity than the original port during intake and compression strokes. The peak combustion pressure of MSH port engine is higher and the time required to reach at the peak pressure is shorter than the original port, so that the effect of the MSH port on fast burn is shown. Also the cyclic variations of peak pressure and the reaching time in the MSH port are apparently reduced.
자동차용 포핏밸브형 2-행정기관의 정상상태 소기유동(Ⅰ); 실험적 연구
강건용(K.Y.Kang),이진욱(J.W.Lee),우세종(S.J.Woo),홍순철(S.C.Hong),정용일(Y.I.Jeong) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1994 No.11_1
Two-stroke engine has inherent advantages over four-stroke engine of greater torque and power, less torque fluctuation and more compactness. At the same time, it has main drawback of the direct short-circuiting and excessive oil consumption. In these days, however, the oil consumption problem has been solved by adapting poppet valve system instead of port type. For the first step study the scavenging flow characteristics of an automotive two-stroke engine is investigated by flow visualization technique under steady condition, in order to ultimately optimize scavenging process using RSSV (rotatable shrouded scavenging valve) system. As working fluid, water is used instead of air to effectively visualize the flow pattern with applying Reynolds analogy.<br/>
[論文] 국산 가솔린 엔진용 저배기공해 System에 관한 연구
성낙원(N. W. Sung),정용일(Y. I. Jeong),박신현(S. H. Park),우세종(S.J. Woo) 한국자동차공학회 1986 오토저널 Vol.8 No.3
In this study, low emission gasoline engine system is developed utilizing an EGR valve, 3 way catalytic converter and electronic fuel injection system. EGR was controlled by a needle valve and optimized at the engine conditions. Throttle body fuel injection system is used for fueling. When the engine was operated at constant speed by the electronic engine control system with the 3 way catalytic converter, the emissions were reduced by 50 to 90% in volume depending on the engine operating conditions.