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중심전극에서 연료를 분사하는 스파크플러그에 의한 예혼합기의 연소특성
박우영(Wooyoung Park),이명준(Myungjun Lee),염정국(Jeongkuk Yeom),하종률(Jongyul Ha),정성식(Sungsik Chung) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
This study proposes a new stratified charge system for low emission and over lean burn. Combustible mixture was induced around sparkplug using a spherical piston cavity and up-right straight port in the genernl method of strntified charge. In this study, method of new stratified charge is to use Injector-sparkplug. This system inject fuel of extremely small quantities and ignite mixture around sparkplug gap. Injector-sparkplug was fitted in the visualized constant volume chamber. The combustion characteristics was compared with conventional ignition method and this method. We examined combustion pressure and lean misfiring limit, visualized combustion flame according to equivalence ratio. As results of this study, in case of using Injector-sparkplug, initial flame propagation speed was increased and total combustion period was reduced in the over lean bum the same equivalence ratio. These phenomena present more remarkable under conditions of lean equivalence ratio and lean misfiring limit was extended.
미소영역 성층혼합기 유도를 위한 스파크플러그에 관한 연구
박우영(Wooyoung Park),이명준(Myungjun Lee),염정국(Jeongkuk Yeom),하종률(Jongyul Ha),정성식(Sungsik Chung) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
This study proposes a new stratifide charge system for low emission and over lean bum. Combustible mixture was induced around sparkplug using a spherical piston cavity and up-right straight potr in the general method of stratified charge. In this study, a method of new stratified charge is to use injector-sparkplug. This system injects fuel of extremely small quantities and ignite mixture around sparkplug gap. Injector-sparkplug was fitted in the visualized constant volume chamber. The combustion characteristics was compared with conventional ignition method and this method. We examined combustion pressure and lean misfiring limit, visualized combustion flame according to equivalence ratio.<br/> As results of this study, in case of using injector-sparkplug, initial flame propagation speed was increased and total combustion period was reduced in the over lean bum in the same equivalence ratio. These phenomena occurred clearly under the conditions of lean equivalence ratio. Furthrmore, the lean misfiring limit of mixture was estended by using the injector-sparkplug.
Cooled EGR을 적용한 HEDI 디젤엔진에서의 배기 특성에 관한 연구
임종완(Jongwan Lim),박우영(Wooyoung Park),강병무(Byungmu Kang),염정국(Jungkuk Yeom),정성식(Sungsik Chung),하종률(Jongyul Ha) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
EGR is applied to diesel engines as the main measure to reduce NOx emissions. However, the application of EGR is also having a problems which we have to solve. In particular, EGR system has relation the trade-off between NOx and Soot emissions, especially at high loads.<br/> Reducing NOx and Soot emissions from diesel engine, and improving fuel consumption simultaneously are important in meeting government regulations and society's needs.<br/> In this study, the effects of Cooled EGR on the characteristics of NOx and Soot have been investigated using HSDI(High Speed Direct Injection) diesel engine operating at various loads and speeds.<br/>