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실리카퓸과 페로니켈슬래그를 미분말을 혼입한 콘크리트의 산 저항성 평가
김지석(Kim, Jiseok),한동훈(Han, Dong Hoon),김진욱(Kim, Jin Uk),안기용(Ann, Ki Yong) 한국콘크리트학회 2021 한국콘크리트학회 학술대회 논문집 Vol.33 No.2
본 연구는 실리카퓸과 페로니켈슬래그 미분말을 혼합한 3성분계 콘크리트에 대하여 산 저항성 평가와 시멘트 매트릭스 내의 알칼리성에 대한 평가를 실시하였다. The present study concerns the acid neutralization capacity(ANC) of ternary blended concrete using silica fume and ferronickel slag powder.
직분사가솔린엔진에서의 초고압 연료분사시스템 적용에 따른 연소 및 배기 특성
장지환(Jihwan Jang),박정환(Jeonghwan Park),김지석(Jiseok Kim),유영수(Youngsoo Yu),박성욱(Sungwook Park),김형익(Hyungik Kim) 한국자동차공학회 2022 한국 자동차공학회논문집 Vol.30 No.2
In this study, in an attempt to analyze the effect on combustion and the exhaust characteristics of the ultra-high pressure fuel injection system in the gasoline direct injection(GDI) engine, the conventional fuel injection pressure of 350 bar and the 500 bar fuel injection system were compared. To improve the delay of the needle behavior due to the fuel pressure of 500 bar, a non-magnetic ring was inserted so that magnetic force loss would not occur, unlike the low-pass method of a magnetic force transfer of the existing injector. In the process of engine evaluation, indicated mean effective pressure(IMEP) and brake specific fuel consumption(BSFC) results based on load were compared, while combustion speed and loss were calculated by additionally measuring engine combustion pressure. As a result, in terms of combustion speed and loss, the 350 bar system showed better results under the low load condition, but, as the load increased, the 500 bar system showed faster combustion speed and less loss. Lastly, in the case of exhaust gas emission characteristics, when the exhaust results for the 350 bar and 500 bar fuel injection systems were compared, NOx emission showed a higher emission at the 500 bar condition, compared to the 350 bar, as the load condition increased. Conversely, in the case of CO emission, lower emission could be confirmed at 500 bar condition as the load condition increases. This result can be considered as influencing combustion temperature according to the combustion rate. Furthermore, in the results of particle number(PN) emission, high PN reduction was confirmed by the application of an ultra-high pressure injection.