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최인용(I.Y.Choi),전광민(K.M.Chun),박철웅(C.W.Park),한재원(J.W.Hahn) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
End gas temperatures were measured by CARS(Coherent anti-Stokes Raman spectroscopy) technique in a constant volume combustion chamber. The temperatures of unburned and burned gas for premixed propane-air flame were measured for different initial temperature conditions. The measured temperature profiles were compared with predicted results of simulation performed using a 2-zone flame propagation model. The measured temperatures of the unbumed gas were distinguished from that of the burned at the flame sheet. The unbumed gas temperatures varied between 400 K and 600 K and the standard deviation of 10 measurements at each measuring time was about ±40 K. The predicted results of simulation confirmed the measured temperatures in each zone.<br/>
전광민(K.M.Chun),장원준(W.J.Jang) 한국자동차공학회 1991 오토저널 Vol.13 No.6
Spart-ignition engine knock is an abnormal combustion phenomenon originated from autoignition of a portion of or the entire end-gas during the later stage of combustion process. And engine knock is accompanied by a vibration of engine cylinder block and a high-pitched metallic noise. Engine knock is characterized in terms of its intensity, its occurrence crank angle and the percentage of engine knock cycles. To characterize engine knock, a precise measurements of cylinder pressure and a statistical analysis of cylinder pressure data are needed. The purpose of this study is to develope a technique to measure engine knock and its characteristics as a function of ignition timing change.<br/> A 4-cylinder spark-ignition engine and unleaded gasoline, whose octane number was 94, were used for experiments. To measure engine knock and to analyze engine knock characteristics, cylinder pressure data were sampled by a high speed data acquisition system which was developed in this study. Cylinder pressure data were sampled at each 0.1˚ crank angle and the number of cycles continuously sampled was 80.
김경운(K.W.Kim),전광민(K.M.Chun) 한국자동차공학회 1993 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In recent years. high efflciency. high performance. and low pollutant emmision engines have been developed. Knock phenomenon has drawn Interests because It became an hindrance to engine power and efflclency Increase through higher compression ratio.<br/> Knock phenomenon is an abnormal combustion origlnated from autolgnitlon of unburned gas in the end-gas region during the later stage of combustion process and accompanied a high pitched metallic noise. And this phenomenon is characterlzed by knock occurrence percentage, knock occurrence angle and knock Intensity.<br/> A four cylinder spark Ignition engine Is used In our experiment. and Its combustion chamber pressure Is measured at various engine speeds. Ignition timing. The data are analyzed by numerous methods in order to select the optimum methods and to achieve better understanding of knock characteristics.<br/> Methods using band-pass fllter. third derivatlve and step method are shown to be the most suitable. While methods using frequency analysis are shown to be unsuitable. Because step method only uses signals above threshold value during knocking condition. pressure signal analyses With this method show good signal-to-noise ratio.<br/>
3기통 스파크 점화기관의 흡ㆍ배기관내에서의 압력변화에 관한 연구
김형기(H.K.KIM),전광민(K.M.CHUN) 한국자동차공학회 1992 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1992 No.11
The purpose of this study is to investigate the flow through the intake and exhaust manifolds in a three-cylinder spark-ignition engine.<br/> The flow in the intake and exhaust manifolds was calculated using the characteristic method and the gas properties in the cylinder were calculated using the first law of thermodynamics.<br/> In the experiment, using four-stroke three-cylinder spark-ignition engine, the pressure in the intake and exhaust manifolds was measured and compared with the result of numerical analysis.<br/> From the comparison, following conclusion was obtained. The results obtained from the experiment were in accord with those from calculation. In the intake manifold, pressure wave which has three peaks per cycle was observed in both cases of experiment and calculation. The three peaks were combined with many small peaks reflected from the bended intake manifold wall. In the exhaust manifold, pressure wave per cycle has six peaks in both cases of experiment and calculation. The large peaks occur at blowdown phase and the small peaks occur at displacement phase.
SI 엔진의 공회전 상태에서의 연소 안정성 개선에 관한 연구
주신혁(S.H.Joo),전광민(K.M.Chun) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
The objective of this study is to improve the idle combustion stability of the SI engine. In order to satisfy this objective, an uniquely designed mixture gas injection device is installed to the engine, and the combustion characteristics are analysed by flame visualization and pressure aquisition techniques<br/> This device makes the mixture gas enter the cylinder tangentially with high velocity. Therefore, it can reinforce the swirl flow. This device can also reduce the burned gas backflow as it makes the intake port charged with the mixture gas by 1 atm just before the intake valve opening time. The reduced pressure difference between the intake port and the combustion chamber at the early stage of the intake process make it possible to reduce the burned gas backflow.<br/> As a result of the reinforced swirl flow and the reduced backflow, the early flame rotates to the swirl direction and the COV_imep is improved about 50 % when the mixture injection device is installed.<br/>