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프리피스톤 수소기관의 연소안정화 및 성능향상에 관한 연구
노기철,윤재성,김강문,박상욱,이종태,Noh, K.C.,Yoon, J.S.,Kim, K.M.,Park, S.W.,Lee, J.T. 한국수소및신에너지학회 2006 한국수소 및 신에너지학회논문집 Vol.17 No.2
A free-piston hydrogen fueled engine is considered as one of the next power systems which is able to obtain high efficiency and low emission, simultaneously. In this study, in order to ensure the possibility as the next generation power system, the combustion characteristics and the performance of the free-piston hydrogen fueled engine are analyzed by using the linear RICEM for the change of injection pressure and equivalence ratio. As the results, in-cylinder maximum pressure is shown at injection pressure $P_{inj}$=6bar. Backfire phenomenon is not observed under experimental condition and knock occurs over ${\Phi}=0.8$. The thermal efficiency is the highest at injection pressure, $P_{inj}$=6bar and equivalence ratio, ${\Phi}=0.7$, respectively.
프리피스톤 수소기관의 연소안정화 및 성능향상에 관한 연구
노기철,이종태,윤재성,김강문,박상욱 한국수소및신에너지학회 2006 한국수소 및 신에너지학회논문집 Vol.17 No.3
A free-piston hydrogen fueled engine is considered as one of the next power systems which is able to obtain high efficiency and low emission, simultaneously. In this study, in order to ensure the possibility as the next generation power system, the combustion characteristics and the performance of the free-piston hydrogen fueled engine are analyzed by using the linear RICEM for the change of injection pressure and equivalence ratio.As the results, in-cylinder maximum pressure is shown at injection pressure Pinj=6bar. Backfire phenomenon is not observed under experimental condition and knock occurs over φ=0.8. The thermal efficiency is the highest at injection pressure, Pinj=6bar and equivalence ratio, φ=0.7, respectively.
연료 고압화에 의한 LPDi 기관의 인젝터 내 기포발생 억제에 관한 기초 연구
노기철,이종태,Noh, Ki-Chol,Lee, Jong-Tai 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.3
To suppress the bubble generated in the liquid LPG direct injector is the most important to develop the LPDi engine. It was found in the previous study that bubbling phenomenon in the injector of the LPDi engine is decisively influenced by pressure of fuel and temperature around the injector. Therefore, in this study, the effect on suppressing the bubbling in the LPDi injector by high pressurization of fuel is analyzed and the spray characteristics are also studied. As a result, it is found that the bubbling in the LPDi injector is radically suppressed when the pressure of fuel is over 50MPa. The bubbling is suppressed when the pressure of fuel is over 3MPa if the inserted position of the injector is considered. Also, it is confirmed that the higher the pressure of fuel is the longer spray tip penetration and is the larger spray angle. As the ambient pressure increases, spray tip penetration decreases and spray angle increases due to the increase of drag force.
디젤기관의 아트킨슨 사이클화를 위한 실린더내 PIV 유동계측
노기철(Kichol Noh),정양주(Yangjoo Jeong),이종태(Jongtai Lee) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
The adoption of Atkinson-cycle in disel engine with conventional piston type is considered as one of the methods to increase the thermal efficiency. The realization of atkinson-cycle in diesel engine can be realized by early or late intake valve closing timing same as otto engine. <br/> In this study, to suggest the appropriate intake valve closing timin for realizing diesel-atkinson engine, the in-cylinder flow is visualized by means of PIV method for the cases of advanced and retarded intake valve closing timings compared with conventional type.<br/> From the results, it is found that momentum is the largest and turbulent intensity is kept to the end of compression process due to the inertia effect and the increase of flow around the middle of compression process at 50?? retarded of closing timing.
LPDi 기관의 인젝터 내 기포발생 억제를 위한 기초연구
노기철(Kichol Noh),이제홍(Jehong Lee),이종태(Jongtai Lee) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
The one of the most important subject to develop a LPDi engine is to suppress the generation of bubble inside the liquid LPG direct injector. In this study, the preventing effect of bubble generation by cooling of the surrounding of injector and through by-pass under firing stop was analyzed.<br/> As results, it was found that the temperature of bubble generation increases about 4K by cooling 20K in the surrounding temperature of an injector at 30bars of fuel pressure. As the surround temperature of the injector increases after bubbles are generated, bubbles are awfully generated. The spray tip penetration decreases about 17% when the surrounding temperature increases 8K. It was seen that the generation of bubble is able to be prevented by menas of 60% of by-pass.