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SI 엔진의 에탄올 연료(E100)의 연소 및 배기특성에 관한 연구
연인모(In Mo Youn),김대성(Dae Sung Kim),하성용(Sung Yong Ha),노현구(Hyun Gu Roh),이창식(Chang Sik Lee) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
An experimental investigation was conducted to investigate the effect of ethanol fuel on the engine performance and the exhaust emission characteristics under the various engine operating conditions. To investigate the effect of ethanol fuel, the SI engine equipped with 4 cylinder was tested on EC dynamometer and 1591cc of piston displacement. The engine performance included brake torque. brake specific fuel consumption, and brake specific energy consumption of ethanol fuel is compared to those obtained by pure gasoline. Furthermore, the exhaust emissions were analyzed in terms of regulated exhaust emissions such as unburned hydrocarbon, oxides of nitrogen, and carbon monoxide. The result of this work showed that the effect of ethanol to gasoline caused drastic decreases in emissions under various operating conditions. The investigation results showed improved engine performance in brake torque and brake power by ethanol fuel.
4기통 디젤엔진에서 디젤-에탄올 혼합연료의 분무 및 연소 특성에 관한 연구
박수한(Su Han Park),연인모(In mo Youn),이창식(Chang Sik Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The aim of this study is to analyze the effect of the ethanol blending in diesel-ethanol blended fuels on the spray-atomization characteristics and combustion-exhaust emissions characteristics in a common-rail 4-cylinder diesel engine. For the analysis of the spray characteristics, the spray images were obtained using the high speed camera with metal-halide lamps. From these spray images, the macroscopic spray characteristics such as the spray tip penetration and spray cone angle were investigated. Also, the combustion characteristics including the combustion pressure and the rate of heat release were studied with the analysis of the exhaust emissions characteristics such as CO, HC, and NOx in a diesel engine fueled with diesel-ethanol blended fuel. It can be confirmed from the spray experiment of diesel-ethanol blended fuels that the increased ethanol blending ratio induced the decrease of the spray tip penetration after the end of the injection by the decrease of the fuel density and spray momentum. The spray cone angle showed the increasing trend. In the atomization experiment, the ethanol blending caused the improvement of the diesel atomization performance. On the other hand, at the same engine load condition, the increase of the ethanol blending ratio lead to lengthen the ignition delay of the blended fuels, and to decrease the peak combustion pressure and the rate of heat release. The combustion and emission characteristics of ULSD and DE10 showed a similar pattern and value, while DE20 indicated CO and HC emissions rapidly increased, and NOx decreased. It can be believed that 20% ethanol disturbed the combustion of diesel-ethanol blended fuel due to the low cetane number and evaporation.
류봉우(Bong Woo Ryu),연인모(In Mo Youn),박성욱(Sung Wook Park),이창식(Chang Sik Lee) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
The combustion characteristics of dimethyl ether (DME) were investigated using the experimental and numerical methods. For the numerical approach, the combustion characteristics of DME fueled engine were predicted by 3D-CFD code, KIVA code coupled with the CHEMKIN (KIVA-CHEMKN) and the spray calculation was conducted by considering the thermo-chemical properties of DME. In order to calculate the fuel oxidation and emission formation (NOx), a detailed chemical kinetic mechanism which was composed of 83 species and 360 reaction paths was considered. The pressure of combustion chamber from the calculation agrees well with the measurements from the test engine. The amount of NOx emission has a good agreement to experiments.
4 실린더 커먼레일 직접분사식 DME 디젤 엔진의 성능 및 배기 특성
이동곤(Donggon Lee),연인모(In Mo Youn),노현구(Hyun Gu Roh),최석천(Seuk Cheun Choi),이창식(Chang Sik Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
This study investigated the effects of DME blended fuel on the engine performances and emission characteristics of four cylinder CRDI diesel engine. Bio-diesel was added into the DME fuel due to the low kinematic viscosity of DME fuel. Pressure and temperature controllers were installed to maintain the fuel pressure and temperature. The experiment was performed under a constant engine speed, load and injection pressure and then injection timing and injection strategies were varied. The result of exhaust emissions fueled DME with single injection showed slightly higher NOx emission with lower HC and CO emission characteristics in comparison with those of diesel fuel. When the pilot injection was applied in DME fueled engine, NOx emission was reduced more than single injection. In this study, PM(Particulate Matter) emission was not observed.
2단연소방식이 디젤엔진의 연소성능 및 배출물 특성에 미치는 영향
정규수(Kyusoo Jeong),이동곤(Donggon Lee),연인모(In Mo Youn),노현구(Hyun Gu Roh),박성욱(Sungwook Park),이창식(Chang Sik Lee) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
The purpose of this study was to analyze the effect of two-stage injection on combustion performance and NOx reduction characteristics in a four cylinder diesel engine. The experiment was carried out under various first injection quantity and EGR rate at constant engine speed, load condition. In addition, the combustion and emission results were compared with the case of applied single injection timing at TDC. The experimental results show that NOx emissions of two-stage combustion strategy were clearly reduced, however, fuel consumption was slightly increased compared with single fuel injection. Also, soot emissions showed similar trends except of the 20% EGR rate.