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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.
실린더 직접분사식 디젤엔진에서 바이오디젤 혼합연료의 연소 및 배기특성
이동곤(Donggon Lee),노현구(Hyun Gu Roh),최석천(Seuk Cheun Choi),이창식(Chang Sik Lee) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.2
본 연구는 4실린더 커먼레일 디젤엔진에 바이오디젤 혼합 디젤연료를 적용하였을 경우 엔진의 연소특성과 배출물 저감효과를 실험적으로 구한 것이다. 실험 연료는 바이오디젤 20%와 디젤연료 80%(체적분율)를 혼합한 BD20과 저유황디젤연료(ULSD)를 사용하였으며, 연료분사압과 엔진회전수를 변수로하여 실험을 수행하였다. 실험결과 B20과 ULSD 모두 연료분사압력이 증가함에 따라 NOX 배출농도는 증가하고, Soot 배출량은 감소하는 경향을 나타내었다. 특히 BD20의 경우 ULSD와 비교하여 NOX 배출농도는 다소 증가하였으나, Soot 배출량은 현저하게 감소하였다. 또한, 회전속도가 1000rpm에서 2000rpm으로 증가함에 따라 NOX 배출농도는 감소하고, Soot 배출량은 낮은 분사압력에서 현저히 증가하는 경향을 나타내었다. This paper describes the effects of biodiesel blended fuel on the engine combustion and emission characteristics in a four cylinder CRDI(Common-rail direct injection) diesel engine. In this work, the biodiesel-diesel blended fuel(20% of biodiesel and 80% of ULSD(ultra low sulfur diesel) by volume ratio, BD20) and ULSD fuel are used under the various injection pressures and engine speeds. The experimental results of BD20 and ULSD fuel show that NOX emissions were increased and soot emissions were decreased with the increase of injection pressure. In particular, NOX emissions were slightly increased for the BD20 fuel, however, soot emissions were significantly reduced compared to the ULSD fuel. When the engine speed is increased from 1000rpm to 2000rpm, NOX emissions are decreased at all tested conditions, and soot emissions are largely increased at lower injection pressure.
4 실린더 직접분사식 디젤엔진에서 바이오디젤 혼합연료의 연소 및 배기특성
이동곤(Donggon Lee),노현구(Hyun Gu Roh),최석천(Seuk Cheun Choi),이창식(Chang Sik Lee) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
본 연구는 디젤의 대체연료로 알려진 바이오디젤을 사용하여 점차 강화되어지고 있는 배기가스규제를 만족하는데 주안점을 두고, 바이오디젤 혼합연료가 연소 및 배기특성에 미치는 영향을 저유황디젤과 비교 분석하였다. 바이오디젤 혼합연료는 바이오디젤(대두유)과 저유황디젤을 2:8의 체적비로 혼합하여 사용하였으며, 연료의 분사전략과 분사시기, 그리고 엔진의 부하를 고정한 상태에서 실험 변수로 연료 분사압과 엔진회전속도를 각각 다르게 하여 실험을 수행하였다. 실험 결과 바이오디젤 혼합연료의 경우 저유황디젤과 비교하여 유해 배출물 중 질소산화물은 다소 많이 배출되었으나, 바이오디젤 내에 함유된 산소의 영향으로 인하여 입자상 물질의 배출량은 감소되었다. 또한 엔진회전속도가 증가하면서 질소산화물의 배출량은 저감되는 반면에 입자상 물질의 배출량은 증가되는 경향을 확인할 수 있었다. This study focused on satisfaction of reinforcing exhaust gas regulations using biodiesel known as alternative fuel for diesel fuel. This paper described the effects of biodiesel blended fuel on the engine combustion and emission characteristics in four cylinder CRDI diesel engine. Biodiesel blended fuel is composed of 20% biodiesel(soybean oil) and 80% ULSD(Ultra low sulfur diesel) by volume ratio. As injection pressure and engine speed are changed, the experiment is accomplished under same injection strategies, injection timing, and engine load. The results show that NOx emission is largely generated with biodiesel blended fuel at same condition in compared to that of ULSD. On the other hand, the engine fueled with blended biodiesel generate lower PM(Particulate matter) emission characteristic than ULSD.
바이오디젤 혼합연료를 적용한 승용 디젤엔진의 성능 및 배출물 저감특성
이동곤(Donggon Lee),정규수(Kyusoo Jeong),노현구(Hyun Gu Roh),이창식(Chang Sik Lee) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.43
The effect of various load and injection pressure on combustion and emission characteristics were investigated in a 4-cylinder CRDI diesel engine fueled with biodiesel blends. For investigating the effect of biodiesel blended ratio on combustion characteristics, the experiments were performed at various load conditions and injection pressures. In addition, pilot injection strategy was maintained by pilot injection quantity of 1.6㎎/cycle and pilot injection timing of BTDC 15°. The experimental results based on the application of biodiesel blended fuel to a compression ignition engine showed that the ignition delay when using biodiesel blended fuel was faster than that of conventional diesel fuel(ULSD), and the maximum combustion pressure was higher than when using conventional diesel fuel. In terms of the characteristics of emissions, the particulate matter concentration when using biodiesel blended fuel was reduced and the other emissions of NOx and CO emissions were significantly increased as increased of injection pressure. However, as increased of engine load, HC and CO emissions were reduced.
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.