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김문헌,표영덕 崇實大學校 1987 論文集 Vol.17 No.-
This study is concerned with the fuel-economy and performance problem, and the purpose of this study control of the operating factors to obtain optimum performance in Spak Ignition Engine. The paper discusses the determination of the optimum driving conditions. Two objectives, torque condition and brake specific fuel consumption, are considered for optimization. The effects of the three variables (air-fuel ratio, engine speed and spark advance) on the objective function are analyzed by experiments and computer calculation. Experimental model and several constraints of actual engine operation are required to obtain the Optimum conditons. Gradient projection method is used to find the maximum of multivariable, nonlinear function subject to linear constraints.
고압축비 메탄올 기관의 연소실 벽면에서의 열유동에 관한 연구
김문헌,박정서 崇實大學校 生産技術硏究所 1995 論文集 Vol.25 No.1
Instantaneous surface temperature and unsteady heat flow of combustion chamber wall in a high compression ratio methanol engine were investigated as a function of compression ratio and engine speed. The instantaneous surface temperature of combustion chamber wall is high near by exhaust valve, low near by intake valve. And instantaneous surface temperature and heat flux of combustion chamber wall on methanol engine are increased according to increase compression ratio and engine speed. The largest temperature difference is about 150 K between each location. Estimation of thermal load in combution chamber wall have to estimate unsteady heat flux because of maximum heat flux is 15 times of as large as mean heat flux. Maximum heat flux rise rate at compression ratio 15.5 increase 51 per cent than that of compression ratio 7.5. And maximum and mean heat fluxs are dominated by the amount of supplied heat according to the variations of compression ratio and engine speed.
金文憲 崇田大學校 1983 論文集 Vol.13 No.1
This analysis shows that engine performance, variation of maximum pressure of the cycle, rate of heat release, and combustion delay are influenced by the inlet air humidity in the spark-ignition engine. Analysis of combustion process from the indicator diagram should be gained satisfying rate of heat release. The quantitative combustion delay can be obtained from the rate of mass burned. The variation of time loss and effective compression ratio with the change of inlet air humidity are dominated by the development of rate of heat release.
김문헌(Munheon Kim),김홍성(Hongsung Kim) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This work deals with a controlled auto-ignition (CAI) single cylinder gasoline engine, focusing on the extension of operating conditions. The fuel is injected indirectly into electrically heated inlet air flow. In order to keep a homogeneous air-fuel mixing, the fuel injector is water-cooled by a specially designed coolant passage. Investigated are the emission characteristics of compression ignition gasoline engine by the variety of injection timing. The compression ignition gasoline engine can be achieved that the ultra lean-burn with self-ignition of gasoline fuel by heating inlet air. It can be achieved that the emission concentrations of carbon monoxide, hydrocarbons and nitrogen oxide had been significantly reduced by CAI combustion compared with conventional spark ignition engine.<br/>