http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
직접분사식 가솔린 엔진의 분사전략 변경 및 EGR 적용을 통한 배기저감에 관한 연구
박철웅(Cheol Woong Park),김홍석(Hong Suk Kim),우세종(Se Jong Woo),김용래(Yong Rae Kim) 대한기계학회 2012 大韓機械學會論文集B Vol.36 No.3
자동차배출가스는 이산화탄소(CO2 )에 의한 지구온난화 및 탄화수소(HC)와 질소산화물(NOx )에 의한 오존생성을 야기하는 등, 인체와 환경에 나쁜 영향을 미치기 때문에 이에 대한 관심이 증폭되고 있다. 가솔린 직접분사 (Gasoline Direct Injection; GDI)엔진은 디젤엔진과 같이 연소실내에 연료를 직접 공급하는 방식으로서 가솔린엔진의 취약점으로 지적되어 오던 높은 연료소비율 문제를 획기적으로 개선할 수 있는 기술로 평가되고 있다. 본 연구에서는 분무유도방식(Spray-guided type)의 GDI엔진을 이용하여 공기과잉률 2.0 이상의 초희박 연소를 통해 연료소비율을 개선하였다. 추가적인 연료소비율 개선 및 배출가스 저감을 위해 희박연소시 다단분사전략과 Exhaust Gas Recirculation (EGR)을 적용하였다. 배출가스 수준과 운전성능을 평가하고 이를 배출가스 규제와 비교·검토함으로써 국내 관련기술 개발 방향 및 상용화 가능성에 대해 검토하고자 하였다. Nowadays, automobile manufacturers are focusing on the reduction of exhaust-gas emissions because of the harmful effects on humans and the environment, such as global warming by greenhouse gases. Gasoline direct injection (GDI) combustion is a promising technology that can improve fuel economy significantly compared to conventional port fuel injection (PFI) gasoline engines. In the present study, ultra-lean combustion with an excess air ratio of over 2.0 is realized with a spray-guided-type GDI combustion system, so that the fuel consumption is improved by about 13%. The level of exhaust-gas emissions and the operation performance with the multiple injection strategy and exhaust-gas recirculation (EGR) are examined in comparison with the emission regulations and from the point of view of commercialization.
이호열 ( Ho Yeol Lee ),김홍석 ( Hong Suk Kim ),우세종 ( Se Jong Woo ) 한국액체미립화학회 2014 한국액체미립화학회 학술강연회 논문집 Vol.2014 No.-
Urea injection nozzles affect the performance of NOx conversion in urea SCR systems because of their different spray characteristics.This study shows the spray characteristics of an air assisted internal mixing nozzle.The effects of pressure of compressed air and orifice diameter of nozzle on thermal decomposition to ammonia were investigated. In addition, the effect of static mixer on urea decomposition was studied.
디젤-열분해유 유상액을 사용하는 직접분사식 디젤 엔진의 엔진성능 및 배기특성에 관한 연구
이석환 ( Seok Hwan Lee ),김호승 ( Ho Seung Kim ),김태영 ( Tae Young Kim ),우세종 ( Se Jong Woo ),강건용 ( Kern Yong Kang ) 한국분무공학회 2014 한국액체미립화학회지 Vol.19 No.2
Pyrolysis oil (PO), also known as Bio crude oil (BCO), has the potential to displace significant amounts of fuels that are currently derived from petroleum sources. PO has been regarded as an alternative fuel for petroleum fuels to be used in diesel engine. However, the use of PO in a diesel engine requires modifications due to low energy density, high water contents, low acidity, and high viscosity of the PO. One of the easiest way to adopt PO to diesel engine without modifications is emulsification of PO with the fuels that has higher cetane number. However, PO that has high amount of polar chemicals is immiscible with non polar hydrocarbons of diesel. Thus, to stabilize a homogeneous phase of diesel-PO blends, a proper surfactant should be used. In this study, a DI diesel engine operated with diesel and diesel-PO emulsions was experimentally investigated. Performance and gaseous & particle emission characteristics of a diesel engine fuelled by diesel-PO emulsions were examined. Results showed that stable engine operation was possible with the emulsions and engine output power was comparable to diesel operation.
이석환 ( Seok Hwan Lee ),박준혁 ( Jun Hyuk Park ),임기훈 ( Gi Hun Lim ),최영 ( Young Choi ),우세종 ( Se Jong Woo ),강건용 ( Kern Yong Kang ) 한국액체미립화학회 2011 한국액체미립화학회지 Vol.16 No.3
Fast pyrolysis of biomass is one of the most promising technologies for converting biomass to liquid fuels. The pyrolysis oil, also known as the bio crude oil (BCO), have been regarded as an alternative fuel for petroleum fuels to be used in diesel engine. However, the use of BCO in diesel engine requires modifications due to low energy density, high water contents, low acidity, and high viscosity of the BCO. One of the easiest way to adopt BCO to diesel engine without modifications is the use of BCO/diesel emulsions. In this study, a diesel engine operated with diesel, bio diesel (BD), and BCO/diesel emulsion was experimentally investigated. Performance and emission characteristics of a diesel engine fuelled by BCO/diesel emulsion were examined. Results showed that stable engine operation was possible with emulsion and engine output power was comparable to diesel and bio diesel operation. Long term validation of adopting BCO in diesel engine is still needed because the oil is acid, with consequent problems of corrosion especially in the injection system.