http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
CO₂가스첨가에 의한 배기가스 및 연소 특성해석에 관한 연구
엄종호(J.H.UHM),정동수(D.S.JEONG),소지장개(N.KOIKE),소고송남(M>ODAKA) 한국자동차공학회 1993 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
It was recognized that NOx emission and smoke were reduced remarkably with changing the O₂ concentration of intake charge due to adding CO₂ gas and<br/> by controlling injection timing property with the O₂concentration. In (his study<br/> exhaust emissions were analyzed with the combustion characteristics calculated<br/> from cylinder pressure on the O₂ concentration and injection timing for a single cyliner DI diesel engine. To compare the analysis of combustion characteristics<br/> direct combustion photography using by high speed video camera with the O₂<br/> concentration and different injection timing were taken.<br/> <br/> Keyword: NOx Emission, CO2 Gas Addition, Fuel Injection Timing, High Speed Digital Camera, Direct Combustion Photography<br/>
[論文] 엔진 실런더내 난류유동 측정과 정량화방법에 관한 연구
강건용(K. Y. Kang),엄종호(J. H. Uhm),정동수(D. S. Jeong),김용선(Y.S. Kim) 한국자동차공학회 1992 오토저널 Vol.14 No.6
The engine combustion is one of the most important processes affecting performance and emissions. One effective way to improve the engine combustion is to control motion of the charge inside a cylinder by means of optimum induction system design, because the flame speed is mainly determined by the turbulence in a gasoline engine.<br/> This paper describes the measurement and characterization of mean velocity and turbulence intensity inside the cylinder of a 4-valve gasoline engine using laser Doppler velocimeter(LDV) under motoring (non-firing) conditions. Since the measured LDV data in each cycle show small cyclic variation during compression stroke in the tested engine, the mean velocity and turbulence intensity are calculated by ensemble averaging method neglecting cyclic variation effects. In the ensemble averaging method, the effects of the calculation window, in which velocities are assumed as the same crank angle, on mean velocity and turbulence intensity are fully investigated. In addition, the effects of measuring point on the flow characteristics are studied.<br/> With larger calculation window, the mean velocity is shown to be less sensitive with respect to crank angle and turbulence intensity decrease in its absolute amplitude. When the piston approch to the top dead center of compression. the turbulence intensity is found to be homogeneous in the cylinder.
[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.