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엄종호,정동수,이진욱,Eom, Jong-Ho,Jeong, Dong-Su,Lee, Jin-Uk 한국기계연구원 1993 硏究論文集 Vol.23 No.-
To improve flow in-cylinder flow in a 2-valve gasoline engine, various geometries of combustion chambers are modified. Air flow rate, swirl and tumble flow are measured and analyzed by swirl impulse meter and LDV in a steady state flow measuring rig. The results of LDV experiment are compared with the data of swirl impulse meter.
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/>
강건용,엄종호,김용선 한국자동차공학회 1992 오토저널 Vol.14 No.6
The engine combustion is one of the most important process 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. 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 cycle variation during compression stroke in the tested engine, the mean velocity and turbulence intensity are calculated by ensemble averaging method neglecting cycle 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. With large 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.
이수경,엄종호,하동명,이성민 한국산업안전학회 1992 한국안전학회지 Vol.7 No.3
A general theory is developed which enables closed-cup flash points of mixtures of flammable and non-flammable liquid to be estimated from a knowledge of a certain properties of flammability diagram by thermodynamic method. The estimated equations is shown the effect of both the flame inhibiting properties of the vapor of the non-flammable component and the relative volatility of that component. The vapor phase flame inhibition effect results in a even greater elevation of flash points than the relative volatility of that component. Especially in cases of similar vapor phase flame inhibition of the nonflammable component, the relative volatility is affected greater elevation of flash points(extinguishing effect).