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- 저자 : 박수한(Su-Han Park) (검색결과 139 건)
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디젤-에탄올 혼합연료의 에탄올 함량이 미세 그을음(Soot) 입자 배출특성에 미치는 영향
박수한(Su Han Park),차준표(Junepyo Cha),권석주(Seokju Kwon),박성욱(Sungwook Park),이창식(Chang Sik Lee) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.12
본 연구의 목적은 디젤-에탄올 혼합연료로 운전되는 디젤엔진에서 에탄올 혼합비율이 나노 크기 입자 배출 특성에 미치는 영향을 분석하는 것이다. 엔진의 연소 및 배기 배출물 특성은 배기량 373cc 의 단기통 디젤엔진과 배기 배출물 측정 장치, SMPS 를 이용하여 실험하였다. 그을음(soot) 배출은 착화지연기간이 길어짐에 따라 증가하였다. 에탄올 혼합비율이 증가함에 따라 나노 입자의 총 개수 및 질량은 대체로 감소하는 경향을 나타냈다. 그러나 에탄올이 30% 혼합되었을 때 그을음(soot) 입자의 응결로 인해 큰 입자의 수 분포가 증가하였으며, 질량 또한 크게 증가하였다. The purpose of this study is to investigate the effect of ethanol content on the emission of nanosized particles from a diesel-ethanol blended fuel engine. The engine combustion and exhaust emission characteristics of a singlecylinder diesel engine were analyzed using an emission analyzer and an SMPS(scanning mobility particle sizer). The analysis revealed that soot emission increased with the ignition delay. When the ignition delay was fixed, an increase in the ethanol content caused a decrease in the soot emission. With an increase in the ethanol blending ratio, the number concentration and mass distribution of nanosized particles generally decreased. However, for 30% ethanol blending, large particles were observed because of the agglomeration of soot particles, and consequently, the particle mass increased.
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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.
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