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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.
디젤엔진에서 디젤-에탄올-바이오디젤 혼합연료의 분무 및 연소 특성에 관한 연구
박수한(Su Han Park),연인모(In Mo Youn),이창식(Chang Sik Lee) 한국자동차공학회 2010 한국 자동차공학회논문집 Vol.18 No.5
The aim of this study is to analyze the effect of the ethanol blending in diesel-ethanol blended fuels on the spray and combustion characteristics in a common-rail four-cylinder diesel engine. For the analysis of the spray characteristics, the spray images were obtained using a 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 in diesel-ethanol blended fuel driven diesel engine. It can be confirmed from the experiment on spray characteristics 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. The spray cone angle slightly increased by the blending of ethanol fuel. In the experiment on atomization characteristics, 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 delays, and to decrease the peak combustion pressure and the rate of heat release. Totally, the combustion and emission characteristics of ULSD and DE10 showed similar characteristics. However, in the case of DE20, CO and HC rapidly increased, and NO<SUB>x</SUB> 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.
DME를 이용한 승용 디젤 커먼레일 엔진의 연소 및 배기특성
이동곤(Donggon Lee),연인모(In Mo Youn),노현구(Hyun Gu Roh),최석천(Seuk Cheun Choi),이창식(Chang Sik Lee) 한국자동차공학회 2010 한국 자동차공학회논문집 Vol.18 No.6
This paper described the effects of DME blended fuel on the engine combustion and emission characteristics of four cylinder CRDI diesel engine. Biodiesel was added into the DME fuel in order to improve the low kinematic viscosity of DME fuel. In this work, the experiment was performed under th various injection timings and injection strategy at constant engine speed and engine load. To maintain the fuel pressure and temperature, pressure and temperature controllers were installed to the DME fuel system. The results show that ignition delay was shortened and combustion duration was extended when DME blended fuel is supplied. Despite of slightly higher NOx emission with DME blended fuel at equal conditions in comparison with those of diesel fuel, the engine showed lower HC and CO emission characteristics.
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.
4실린더 커먼레일 디젤엔진에서 바이오디젤 혼합연료와 EGR율에 따른 연소 및 배기특성
정규수(Kyusoo Jeong),이동곤(Donggon Lee),연인모(In Mo Youn),노현구(Hyun Gu Roh),박성욱(Sungwook Park),이창식(Chang Sik Lee) 한국자동차공학회 2011 한국 자동차공학회논문집 Vol.19 No.4
This study describes the effect of EGR rate on the combustion and emissions characteristics of a four cylinder CRDI diesel engine using biodiesel (soybean oil) blended diesel fuel. The test fuel is composed of 30% biodiesel and 70% ULSD (ultra low sulfur diesel) by volumetric ratio. The experiment of engine emissions and performance characteristics were performed under the various EGR rates. The experimental results showed that ignition delay was extended, the maximum combustion pressure and heat release gradually were decreased with increasing EGR rate. Comparing biodiesel blended fuel to ULSD, the injection quantity of biodiesel blended fuel was further increased than ULSD. The emission results showed that NOx emission of biodiesel blended fuel becomes higher according to the increase of EGR rate. However, in the case of biodiesel blended fuel, HC, CO and soot emissions were decreased compared to ULSD.