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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/>
플라즈마 제트 플러그의 형상이 정적연소기내 연소특성에 미치는 영향
김문헌,유호선,오병진,박정서,Kim, Munheon,Yoo, Hoseon,Oh, Byungjin,Park, Jungseo 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.5
This paper presents combustion characteristics of LPG-air mixture ignited by the plasma jet in a cylindrical vessel with constant volume, in which our focus is placed on the multi-hole plug configuration. Four types of the plug configuration depending on the number of orifice and the arranged angle are considered, along with two cases of conventional spark ignition for comparison. Not only the flame propagation is photographed at intervals, but the pressure in the combustion chamber is also recorded through the entire combustion process. The results show that the plasma jet ignition enhances the overall combustion rate remarkably in comparison to the spark ignition by generating irregular flame front and penetrating through the unburned mixture. The combustion enhancement rate agrees favorably with the available data, which supports the validity of our experiment. Synthetically estimating, the two-hole sixty-degree plug appears to be the most desirable, in that the maximum pressure as well as the combustion duration is less affected by the sub-energy level than the others. It is also deduced that there may exist an optimal plug configuration capable of rapid combustion for a specific combustion chamber.
고압 연료분사용 피에조 액츄에이터 모델링 및 유압 동특성 해석
김민식(Minsik Kim),이광성(Gwangseog Lee),이중협(Junghyup Lee),이진욱(Jinwook Lee),유호선(Hoseon Yoo),김문헌(Munheon Kim) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
In this study, a piezo-driven injector, as a new method driven by piezoelectric energy, has been designed and investigated based on the concept of inverse piezo-electric effect to overcome the major drawbacks of conventional solenoid-driven injector. So it has been applied with a purpose to develop the analysis model of the piezo actuator to predict the dynamics characteristics of the hydraulic component(injector) by using the AMESim code. Aimed at simulating the hydraulic behavior of the piezo-driven injector, the circuit model has been developed and verified by comparison with the experimental results. The effects of an electric control between the solenoid valve and piezo-ceramic stack for injector needle’s driving on the dynamic characteristics were usually investigated. As this research results, we found that the input voltage exerted on piezo stack is the dominant factor and the piezo-driven injector has more degrees of freedom in controlling the fuel injection with the high pressure than a solenoid-driven injector.
김홍성(Hongsung Kim),김문헌(Munheon Kim) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
It was established to the system, which adapted combustion system not following spark<br/> ignition system without any ignition apparatus. Adapting the method of increasing inlet-air<br/> heating temperature made possible enhanced the compression ignition characteristics of gasoline<br/> fuel injected to intake-port. It was established the compression ignition gasoline engine. So, the<br/> system was investigated the performance characteristics of compression ignition gasoline engine<br/> by the variety of injection timing.
김홍성(Hongsung Kim),박정서(Jungseo Park),김문헌(Munheon Kim) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_1
It was established to the system, which adapted combustion system not following spark ignition system without any ignition apparatus. It was heated and controlled inlet-air into conventional single cylinder engin. Adapting the method of increasing inlet-air heating temperature made possible enhanced the compression ignition cbaIacteristics of gasoline fuel injected to intake-port. It was established the compression ignition gasolin engin. So, the system was investigated the emission characteristics of compression ignition gasolin engine. The conclusions of combustion emission chracteristics are as followed.<br/> The gasoline compression ignition system made possible to run lean bum(over air-fuel ratio 30) the engine, and emission of carbon monoxide was emitted little about the changes of air-fuel ratio. Inlet-air heating temperature and the changes of engine speed were hardly got influenced. The emission of hydrocaIbon was increased as much as air-fuel ratio's increased<br/> But the ranges of changes was very narrow. It was emitted little only as much as 2 ppm and 4 ppm within the changes of inlet-air heating temperature and engine speed. The emission of nitrogen oxide was decreased greatly as much as air-fuel ratio was decreased. When air-fuel ratio was over 45, the emission of nitrogen oxide was emitted little in case that the changes of inlet-air heating temperature and engine speed.<br/> The achievements of gasoline compression ignition system could improved that the emission concentrations of carbon monoxide, hydrocarbon and nitrogen oxide were reduced greatly.
DME연료를 사용한 인라인펌프 직접분사 디젤기관의 성능 및 배기 특성(2)
표영덕(Youngdug Pyo),김문헌(Munheon Kim),오전근(Jeonkeun Oh),방진환(Jinhwan Bang),김강출(Gangchul Kim),이영재(Youngjae Lee) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Dimethyl ether (DME) is an oxygenated fuel with a cetane number higher than that of diesel oil. It meets the ULEV emission regulation and reduces the smoke to almost zero when used in a diesel engine. In the present study, engine performance and exhaust emissions were investigated with a 3.3 liter conventional DI diesel engine by using dimethyl ether fuel. In this test, in order to increase the fuel injection rate of DME because of high compressibility and low hearting value compared to that of diesel, the nozzle opening pressure of the injectors was lowered and the plunger stroke of the injection pump was extended. Test results showed that the torque and the power with DME were almost same as those of pure diesel oil, but the brake thermal efficiency increased a little. <br/> Also, smoke index from DME engine showed nearly zero level and NOx was decreased a little compared to diesel oil.
DME연료를 사용한 인라인펌프 직접분사 디젤기관의 성능 및 배기특성(1)
표영덕(Youngdug Pyo),김문헌(Munheon Kim),오전근(Jeonkeun Oh),김강출(Gangchul Kim),이영재(Youngjae Lee) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Dimethyl ether(DME) is an oxygenated fuel with a cetane number higher than that of diesel oil. It meets the ULEV emission regulation and reduces the smoke to almost zero when used in a diesel engine. In the present study, engine performance and exhaust emissions were investigated with a 3.3 liter conventional DI diesel engine by using dimethyl ether fuel. Test results showed that the torque and the power with DME were about 60% as those of pure diesel oil, but the brake thermal efficiency increased a little. Also, smoke index from DME engine showed nearly zero level and NO, was decreased a little compared to diesel oil.