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분위기 압력에 따른 커먼레일 시스템의 비증발 디젤 분무특성에 관한 실험적 연구
전충환(Chunghwan Jeon),정정훈(Jeonghoon Jeong),김현규(Hyunkyu Kim),송주헌(Juhun Song),장영준(Youngjune Jang),조승완(Seungwan Cho) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
It is very important to understand the spray characteristics and fuel injection conditions in direct injection diesel engine because the emission gas compositions from diesel engines are related to spray formation processes. The objective of the papers is the characteristics of the macroscopic behaviour of diesel sprays. In this study, the characteristics of diesel spray has been studied using a shadowgraph and laser scattering. The spray characteristics such as spray tip penetration and spray cone angle studied at various injection pressure and ambient pressure.
정적연소실내 예연소실 설계인자 및 스월 강도에 따른 연소특성에 관한 실험적 연구
전충환(Chunghwan Jeon),양인규(Ingyu Yang),김현규(Hyunkyu Kim),송주헌(Juhun Song),장영준(Youngjune Chang),조승완(Seungwan Cho) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Natural gas is a promising alternative fuel to meet strict engine emission regulations in many countries. The development of natural gas engines requires low emissions along with the demand for better fuel consumption and increased power ratings. In this study, a cylindrical Constant Volume Combustion Chamber(CVCC) was used to investigate the combustion characteristics under different swirl intensity and equivalence ratio. The maximum combustion pressure and mass fraction of burned gas was evaluated in particular by the orifice diameter, volume ratio of pre-chamber, equivalence ratio and swirl intensity. This result could provide combustion characteristics with variation of swirl intensity.
정적연소기에서 커먼레일 시스템을 이용한 디젤 분무 및 연소 특생에 관한 연구
전충환(Chunghwan Jeon),정정훈(Jeonghoon Jeong),김현규(Hyunkyu Kim),송주헌(Juhun Song),장영준(Youngjune Jang) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.10
It is very important to understand the spray characteristics and fuel injection conditions in direct injection diesel engine because the emission gas compositions from diesel engines are related to spray formation processes. The objective of the papers is the characteristics of the behaviour of diesel sprays and combustion. The injection rate measured by the Zeuch's method. In this study, the characteristics of diesel spray and combustion has been studied using a shadowgraph. The numerical study was conducted using a AVL-FIRE.
전충환(Chunghwan Jeon),정정훈(Jeonghoon Jeong),김현규(Hyunkyu Kim),송주헌(Juhun Song),장영준(Youngjune Jang) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
It is very important to understand the spray characteristics and fuel injection conditions in direct injection diesel engine because the emission gas compositions from diesel engines are related to spray formation processes. The objective of the papers is the characteristics of the behaviour of diesel sprays. The injection rate measured by the Zeuch's method. In this study, the characteristics of diesel spray has been studied using a shadowgraph. The non-evaporating diesel spray characteristics such as spray tip penetration and droplet diameter distribution studied at various ambient pressure. The numerical study was conducted using a AVL-FIRE.
정적연소기에서의 메탄-공기 혼합기의 연소특성(3) : 배기배출물
최승환(Seunghwan Choi),전충환(Chunghwan Jeon),장영준(Youngjune Chang) 한국자동차공학회 2004 한국 자동차공학회논문집 Vol.12 No.2
A cylindrical constant volume combustion chamber was used to investigate the exhaust emission characteristics of homogeneous charge, stratified pattern and inhomogeneous charge under various conditions using gas chromatography. In the case of homogeneous charge condition, the CO₂ concentration is proportional to excess air ratio and overall charge pressure, the O₂ concentration is proportional to excess air ratio and the UHC concentration is inversely proportional to ignition time and overall charge pressure, In the case of stratified pattern, the RI(rich injection) condition shows better exhaust emission characteristics, especially CO₂, than that of HI (homogeneous injection) or LI (lean injection) conditions. In inhomogeneous charge conditions, when initial charge pressure is increased, CO₂ and UHC concentration is reduced but O₂ concentration is increased. And when the excess air ratio of initial charge mixture is 3.0, UHC and CO₂ concentration show lowest values.
군 운용 지역의 주행특성을 포장로 주행시험장에 적용한 주행모드 도출에 관한 연구
최낙원(Nakwon Choi),한동식,전충환(Chunghwan Jeon) 한국자동차공학회 2011 한국자동차공학회 지부 학술대회 논문집 Vol.2011 No.10-2
Most of a driving cycle is used to measure fuel consumption (FC) and emissions for a specified vehicle. A driving cycle was reflected geography and traffic characteristics for each country, also, driving characteristic is affected these parameters such as vehicle dynamics, FC and emissions. Therefore, this study is an attempt to develop a driving cycle for military operational area. The methodology is that the driving cycle is constructed considering important parameters to be affected FC. Therefore, this approach is expected to be a better representation of heterogeneous traffic behavior. The driving cycle is constructed using the proposed methodology for smallest RMSE and information value.
CNG 직접분사식 연소기에서의 열량해석(2) : 비균질급기
최승환(Seunghwan Choi),전충환(Chunghwan Jeon),장영준(Youngjune Chang) 한국자동차공학회 2004 한국 자동차공학회논문집 Vol.12 No.2
A cylindrical constant volume combustion bomb is used to investigate the combustion characteristics and to analyzer the heat quantity of inhomogeneous charge methane-air mixture. To analyze the heat quantity, some definitions including the CHR ratio, the UHC ratio and the HL ratio are needed and are calculated. It is shown that the effect of stratification is not significant in case of the overall excess air ratio of 1. 1, mainly due to the higher heat loss and lower thermal efficiency compared to those of homogeneous condition. In the case of the overall excess air ratio of 1.4, as the initial charge pressure decreases, the CHR ratio has been decreased while the HL ratio has been increased. Generally, as the initial charge pressure increases, the amount of injection mixture has been decreased and has resulted in lower mean velocity and turbulence intensity for injection mixture. Also, the injected mixture is too rich to result in mixing deficiency in combustion chamber. From these results, it could be possible to acquire the improvement of thermal efficiency and the reduction of heat loss simultaneously through the 2-stage injection in CNG direct injection engine.
김현규(Hyunkyu Kim),전충환(Chunghwan Jeon),장영준(Youngjun Chang) 한국자동차공학회 2001 한국 자동차공학회논문집 Vol.9 No.5
Environmental protection on the ocean has been interested and nowadays the International maritime organization(IMO) has advanced on the prevention of air pollution from ships. This study presents the emission characteristics of 4 stroke propulsion diesel engine in E2 cycle (constant speed) and E3 cycle(propeller curved speed). Also the effects of important operating parameters in terms of intake air pressure and temperature, and maximum combustion pressure arc described on the specific emissions. Emissions measurement and calculation are processed according to IMO technical code.<br/> The results show that NOx emission level in E3 cycle is higher than E2 cycle due to lower engine speed and lower maximum combustion pressure by retarding fuel injection timing. Intake air temperature has strong influence on NOx emission production. And CO, HC emissions are not affected by maximum combustion pressure and intake air pressure and temperature.
입자추적법을 이용한 가솔린 기관의 실린더 내 정상유동 해석
정구섭(Kuseob Chung),전충환(Chunghwan Jeon),장영준(Youngjune Chang) 한국자동차공학회 2001 한국 자동차공학회논문집 Vol.9 No.4
Analysis and control of intake charge motion such as swirl and tumble are very important to improve the performance of gasoline engines. In this paper, single frame double exposure PTV(particle tracking velocimetry) is used to investigate intake flow characteristic in a steady flow test rig of gasoline engine with 2-valve and pent-roof combustion chamber. To validate this PTV method, we confirmed reliability of this PTV method using chopper, and coaxial burner experiments. The velocity field of intake flow is measured with the intake valve lift variation. It is shown that maximum flow velocity is increased and tumble flow become stronger than inverse tumble flow as valve lift increase.