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IDI 디젤기관에서 바이오디젤유 적용시 분사시기변화에 따른 기관성능과 매연 및 NOx 배출 특성
최승훈(Seunghun Choi),오영택(Youngtaig Oh) 한국자동차공학회 2008 한국 자동차공학회논문집 Vol.16 No.4
Biodiesel fuel(BDF) can be effectively used as an alternative fuel in diesel engine. However, BDF may affect the performance and exhaust emissions in diesel engine because it has different physical and chemical properties from diesel fuel such as viscosity, compressibility and so on. To investigate the effect of injection timing on the characteristics of performance and exhaust emissions with BDF in IDI diesel engine, it was applied the BDF derived from soybean oil in this study. The engine was operated at seven different injection timings from TDC to BTDC 12˚CA and six loads at a single engine speed of 1500rpm. When the fuel injection timing was retarded, better results were showed, which may confirm the advantages of BDF. The simultaneous reduction of smoke and NOx was achieved at some fixed fuel injection timings of an IDI diesel engine.
연소실 형상, 연료성상 변화와 EGR 적용에 의한 디젤기관의 성능 특성 및 배기배출물의 동시저감 연구
오영택(Seunghun Choi),최승훈(Youngtaig Oh),이충호(Choongho Lee),조영태(Youngtae Cho) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_1
In this study, the potential possibility of oxygenated fuel such as ethylene glycol mono-normal butyl ether(EGBE) was investigated for the sake of exhausted smoke reduction from diesel engines. And, the effects of combustion method on exhaust emission between DI and IDI diesel engine were examined, too. Because EGBE includes oxygen content approximately 27.1%, it is a kind of oxygenated fuel that the smoke emission of EGBE blending fuel is reduced remarkably compared with commercial diesel fuel. The test was performed with single and four cylinders, four stroke, DI and IDI diesel engines. This study showed that simultaneous reduction of smoke and NOx emissions could be achieved by combination of oxygenate blending fuels and cooled EGR method both DI and IDI diesel engines. And, variation rates of exhaust emission on DI diesel engine was larger than those of IDI diesel engine.
직접분사식 디젤기관에서 함산소성분(Butyl Ether) 및 EGR의 적용
최승훈(Seunghun Choi),오영택(Youngtaig Oh) 한국자동차공학회 2008 한국 자동차공학회논문집 Vol.16 No.5
This research investigated variations of the engine performance and the exhaust emission characteristic of a direct injection diesel engine by fueling a commercial diesel fuel, which was blended with the di-ether group (butyl-ether: BE). The smoke emission reduced to 26% from the diesel engine with the blending fuel (diesel fuel 80 vol-% + BE 20 vol-%)at the full engine load of 2500 rpm compared to it with the diesel fuel only. The power, torque and brake specific energy consumption of the diesel engine showed very slight differences. The NOx emission from the diesel engine, however, with the blended fuel was higher than with the commercial diesel fuel only. By applying EGR method, as a counter plan of the NOx reduction, this research obtained reductions of the smoke and NOx emission at the same time from the diesel engine with the BE blended diesel fuel.
직접분사식 디젤기관에서 바이오디젤유와 함산소성분 혼합연료 적용시 배기배출물 특성 및 EGR의 적용 연구
최승훈(Seunghun Choi),오영택(Youngtaig Oh) 한국자동차공학회 2008 한국 자동차공학회논문집 Vol.16 No.2
The exhaust emissions of diesel engine are recognized as a major cause influencing environment strongly. In this study, the possibility of biodiesel fuel and oxygenated fuel(dimethoxy methane; DMM) was investigated as an alternative fuel for a naturally aspirated direct injection diesel engine. The smoke emission of blending fuel(biodiesel fuel 90vol-% + DMM 10vol-%) was reduced approximately 70% at 2500rpm, full load in comparison with the diesel fuel. But, power, torque and brake specific energy consumption showed no significant differences. But, NOx emission of biodiesel fuel and DMM blended fuel increased compared with commercial diesel fuel due to the oxygen component in the fuel. It was needed a NOx reduction counterplan that EGR method was used as a countermeasure for NOx reduction. It was found that simultaneous reduction of smoke and NOx emission was achieved with BDF(95 vol-%) and DMM(5 vol-%) blended fuel and cooled EGR method(15%).
농용 디젤기관에서 매연과 NOx의 동시저감에 관한 실험적 연구
최승훈(Seunghun Choi),오영택(Youngtaig Oh) 한국자동차공학회 2003 한국 자동차공학회논문집 Vol.11 No.3
In this study, the potential possibility of oxygenated fuel such as Methyl tertiary butyl ether (MTBE) was investigated for the sake of exhausted smoke reduction from diesel engine. MTBE has been used as a fuel additive blended into unleaded gasoline to improve octane number, but the study of application for diesel engine was incomplete. Because MTBE includes oxygen content approximately 18%, it is a kind of oxygenated fuel that the smoke emission of MTBE is reduced remarkably compared with commercial diesel fuel. But, the NOx emission of MTBE blended fuel is increased compared with commercial diesel fuel. And, it was tried to analyze not only total hydrocarbon but individual hydrocarbon components from C₁to C_6 in exhaust gas using gas chromatography to seek the reason for remarkable reduction of smoke emission. Individual hydrocarbons(C₁<br/> ~C_6) as well as total hydrocarbon of oxygenated fuel are reduced remarkably compared with diesel fuel. And, the effects of exhaust gas recirculation(EGR) on the characteristics of NOx emission has been investigated. too. It was found that simultaneous reduction of smoke and NOx was achieved with oxygenated fuel and cooled EGR method.
상용 커먼레일 디젤기관에서 바이오디젤유(20%) 적용시 내구특성 및 배기배출물 특성 연구
최승훈(Seunghun Choi),오영택(Youngtaig Oh) 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.4
A CRDI diesel engine used to commercial vehicle was fueled with 20% biodiesel fuel(BDF 20) in excess of 150 hours. Engine dynamometer testing was completed at regularly scheduled intervals to monitor the engine performance and exhaust emissions. The engine performance and exhaust emissions were sampled at 1 hour interval for analysis. Also, BSEC with BDF 20 resulted in lower than with diesel fuel. Since the biodiesel fuel used in this study includes oxygen of about 11%, it could influence the combustion process strongly. So, BDF 20 resulted in lower emissions of carbon monoxide, carbon dioxide, and smoke emissions without special increase of oxides of nitrogen than diesel fuel. It was concluded that there was no unusual deterioration of the engine, or any unusual change in exhaust emissions from using the BDF 20.
디젤기관에서 디에테르계 연료의 성상변화와 EGR에 의한 매연과 NOx의 동시저감에 관한 실험적 연구
최승훈(Seunghun Choi),황윤택(Yuntaig Hwang),김우상(Woosang Kim),오영택(Youngtaig oh),박상민(Sangmin park) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The potential possibility of oxygenated fuel for di-ether group oxygenated additives such as Methyl tertiary butyl ether (MTBE) and diethylene glycol dimethyl ether(DGM) were investigated for the sake of exhausted smoke reduction from diesel engine. They include oxygen content approximately from 18% to 36%, it is a kind of oxygenated fuel that the smoke emission of them is reduced remarkably compared with commercial diesel fuel, that is, it can supply oxygen component sufficiently at high loads and speeds in a diesel engine. NOx emission was decreased by exhaust gas recirculation(EGR) method which was applied EGR rate from 5% to 30%. And, simultaneous reduction of smoke and NOx was achieved with combination of EGR and fuel property alteration.<br/>
직접 분사식 디젤기관에서 Dimethoxy Methane과 Cooled EGR방법을 이용한 Smoke와 NOx의 동시저감
최승훈(Seunghun Choi),오영택(Youngtaig Oh),권규식(Kyusik Kwon) 한국자동차공학회 2004 한국 자동차공학회논문집 Vol.12 No.5
In this study, the effects of oxygen component in fuel and exhaust gas recirculation(EGR) method on thc exhaust emissions has been investigated lor a D.I. diesel engine. It was tested to estimate change of exhaust emission characteristics for the commercial diesel fuel and oxygenate blended fuel which has five kinds of blending ratio. Dimethoxy methane(DMM) contains oxygen component 42.5% in itself and it is a kind of effective oxygenated fuel fir reduction of smoke emission. It was affirmed that smoke emission was decreascd with increasing of DMM blending ratio. But, NOx emission was increased compared with commercial diesel fuel. It was needed a NOx reduction counterplan that EGR method was used as a countermeasure tor NOx reduction. It was found that simultaneous reduction of smoke and NOx emission was achieved with DMM blended fuel and cooled EGR method(1015%).<br/>