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밀폐 연소실내의 메탄-공기 예혼합기의 연소 및 라디칼 특성에 관한 연구 (1)
전충환,장영준,Jeon, Chung-Hwan,Jang, Yeong-Jun 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.2
To clarify the effects of equivalence ratio, initial pressure and temperature on the flame propagation and radicals characteristics, a series of the experimental study were conducted in a quiescent methane-air premixture using a constant volume chamber. The development of the flame was visualized following the start of ignition using high speed schlieren photo and radical images by intensified CCD camera. Combustion pressure and ion current were recorded simultaneously according to the experimental conditions which were equivalence ratio with 0.7 to 1.2, initial pressure with 0.08 MPa to 0.40 MPa and initial premixture temperature with 3l3.2K to 403.2K. The results showed that the flame speed by ion current and mass fraction burned by combustion pressure characterized the effects of flame propagation very well. And increased combustion duration due to lean combustion condition that was below equivalence ratio, 0.8 caused cycle variation and decreasing the power of engine.
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.
수소스테이션용 다이아프램 압축기의 다이아프램 구조 해석
전충환(Chunghhwan Jeon),강성규(Seungkyu Kang),장영준(Yongjun Chang),권병수(Byungsu Kwon),안국영(Kookyoung Ahn),이치우(Chiwoo Lee) 한국자동차공학회 2007 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
The diaphragms were designed for hydrogen diaphragm compressor. In this Paper, the structural analysis of a Diaphragm were numerically evaluated under several design parameters and pressure conditions. The diaphragm deflection was due mostly to bending. The diaphragms dad two dangerous zones: at the center and along the contour of fixing ti. It is important to find a variable having great influence on diaphragm stress. The diaphrragm deflection is more important variable than the pressure applied on the diaphragm plane.
선박용 엔진의 텀블형상 및 내부유동 특성에 관한 수치 해석적 연구
전충환(Chung-Hwan Jeon),이병화(Byoung-Hwa Lee),김호성(Ho-Sung Kim) 한국마린엔지니어링학회 2007 한국마린엔지니어링학회 학술대회 논문집 Vol.2007 No.-
Many researches have been studied on in-cylinder flow as one of dominant effects for an engine combustion. Specially because the combustion flame speed is mainly determined by the turbulence at the end of compression process. Tumble and Turbulence ahead of combustion is changed according to combustion figure, compression ratio, RPM like this kind of operation condition, and it has much influence on combustion stability. As this phenomenon make research certainly, combustion stability and effectivity will be improve. This paper describes analytical results of the tumble flow, intensity, turbulence inside the cylinder of maritime engine. 3-D computation has been performed by using STAR-CD v3.26 solver and es-ice.
정적연소실내 메탄-공기 혼합기의 가연한계 및 연소특성에 관한 실험적 연구
전충환(Chung-hwan Jeon),양인규(In-gyu Yang),김현규(Hyunkyu Kim),송주헌(Ju-hun Song),장영준(Young-june Chang) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
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 ambient pressure and equivalence ratio. The maximum combustion pressure, heat release rate and mass fraction of burned gas was evaluated in particular by ambient pressure and equivalence ratio. It also show that variation of flammability limits according to existence of pre-chamber. This result could provide lean bum condition by analyzing combustion characteristics with ambient condition.
LFR 장치를 이용한 입자 크기 변화에 따른 저열량 아역청 미분탄의 연소특성에 관한 실험적 연구
전충환(Chung-Hwan Jeon),김용균(Yong-Gyun Kim),김재동(Yong-Gyun Kim),김규보(Gyu-Bo Kim),송주헌(Ju-Hun Song) 대한기계학회 2010 大韓機械學會論文集B Vol.34 No.3
본 연구는 아역청탄의 미분탄 연소특성에 있어서, 입자크기가 미치는 영향을 알고자 실험을 통해 고찰한 것이다. 본 연구를 위하여, 온도 및 온도 상승률을 고려해 볼 때, 실제 미분탄 연소로의 환경을 잘 구현할 수 있는 층류반응기를 설계하고 이용하였다. 크기가 다른 미분탄 입자들이 탈 때 형성되는 화염구조 및 길이를 본 반응기를 이용해 조사하였다. 육안으로 관찰된 화염구조로부터 석탄연소과정들을 분명하게 구분할 수 있었다. 입자의 크기변동은 휘발분 점화개시점에 미치는 영향이 큰 반면, 휘발분의 연소시간에 미치는 영향은 가장 적었다. 입자의 크기가 커질수록 촤의 화염길이도 증가하였다. 화염불안정성 역시 입자가 커짐에 따라 증대되었다. 일정한 체류시간 간격내에서의 촤의 소비율은 거의 일정하였다. In this study, the effect of particle size on the combustion characteristics of pulverized sub-bituminous coal was experimentally investigated. A laminar-flow-entrained reactor was designed and implemented to realize the desired heating ratio and temperature corresponding to the combustion atmosphere of a pulverized-coal-fueled furnace. The flame length and structure of burning particles according to different sizes were investigated. Coal combustion processes were clearly distinguished by direct visual observation of the flame structure. The onset point of volatile ignition is greatly affected by changes in the particle size, and the burning time of the volatiles is least affected by changes in the particle size. The length and instability of char flame also increase with the increase of the particle size. However, the char consumption rate within the residential time remains nearly constant.
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.
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.