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전광민,Chun, Kwang-Min 대한설비공학회 1982 설비저널 Vol.11 No.1
The water-hammer phenomena caused by pump power failure are analysed by digital computer. Asan cool ins water pipe system has been chosen as a model. It is Shown that after power failure the pressure at the pump outlet drops sharply, and to prevent reverse flow, either butterfly valve or check valve can be used. After the valve closure, pressure oscillates behind the valve. To weaken the pressure wave, it is recommended to install a servo-operated valve in a bypass Line around the pamp and the check valve.
플라즈마와 촉매를 이용한 디젤엔진 배출가수중이 NOx 저감 및 플라즈마 시뮬레이션을 통한 플라즈마 반응의 부산물 예측
전광민(Kwang Min Chun),전배혁(Bae-Hyeock Chun),박광서(Kwang-Seo Park),이형상(Hyeong-Sang Lee),류재홍(Jae Hong Ryu) 한국자동차공학회 2001 한국자동차공학회 Workshop Vol.2001 No.-
NOx reduction by a plasma/catalyst system was tested with modeled gas and diesel exhaust gas. Ag/Al₂O₃was used as the catalyst. The oxidation of NO to N0₂by the plasma was increased as HC concentration and input energy density increased. The presence of H₂O in the reactant gas led to the production of acid by plasma. The catalytic activity for NOx reduction was enhanced by the assistance of plasma especially in the lower temperature region. The NOx conversion to N₂ was evaluated by a gas chromatography in the model gas with helium as the balance gas. The result in helium balance gas showed that the selectivity to N₂ depended on the catalyst temperature and was also enhanced by the assistance of plasma. The 50% of NOx removal from the diesel exhaust gas was achieved by the plasma/catalyst system. A kinetic simulation model was also developed to characterize the plasma chemistry in modeled gas. The model uses ELENDIF program to solve Boltzmann equation for electron energy distribution function, and CHEMKIN-II program to solve stiff ODE(ordinary differential equation) problems for species concentrations. The corona discharge energy per voltage pulse and the time-space averaged EIN were obtained by fitting the model to experimental data. The model calculation shows good agreement for NO and N0₂ concentrations with the experimental data, and predicts the formation of byproducts such as CH₂O, CH₃HCO, CO and CH₃N0₂.
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.