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DME-바이오디젤 혼합연료의 DI 디젤엔진 성능 및 배기가스특성
표영덕(Youngdug Pyo),김강출(Kangchul Kim),남상훈(Sanghoon Nam),이영재(Youngjae Lee) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_1
Dimethyl Ether(DME) is a promising alternative fuel to reduce the smoke to almost zero level when used in diesel engines. However, neat DME may cause serious wear on the fuel injection system because of its low lubricity. In the present study, biodiesel which is another promising alternative fuel for diesel engine was used to improve the low lubricity of DME without deterioration of smoke-free characteristic of DME. Test results show that the DME-biodiesel blended fuels show almost zero smoke with good engine performance.
노태석(Taeseok Noh),김강출(Kangchul Kim),우영민(Youngmin Woo),이용균(Yonggyun Lee),류정인(Jungin Ryu),이영재(Youngjae Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Linear engines give power output more efficiently compared to conventional reciprocating piston engine, because it doesn't have a crank mechanism, hence there is less mechanical loss. In addition, if hydrogen fuel is used in a linear engine, it would be possible to make exhaust emission level almost zero without sacrificing the efficiency. In this study, a prototype linear engine was developed and a hydraulic starting system was adopted to give it a motion. It was possible to operate the engine at a velocity of 17㎐. The linear engine was found to give various positions of piston at TDC and different combustion characteristics at each fire. This irregular moving characteristics is mainly caused by the degree of freedom of the piston without crank mechanism in the linear engine and resultantly the subsequent combustion was affected significantly. In extreme cases, abnormal combustion or misfire brought out and this made the engine stop because there is no mechanism to save the inertia energy in the linear engine.