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액상분사식 LPG 연료공급방식의 아이싱현상에 관한 연구
김창업 ( C. U. Kim ),오승묵 ( S. M. Oh ),강건용 ( K. Y. Kang ) 한국분무공학회 2003 한국액체미립화학회지 Vol.8 No.1
N/A The liquid phase LPG injection (LPLI) system is considered as one of the next generation fuel supply systems for LPG vehicles, since it can accomplish the higher power, higher efficiency, and lower emission characteristics than the existing mixer type fuel supply system. However, during the injection of liquid LPG fuel into the inlet duct of an engine, an large quantity of heat is extracted due to evaporation of fuel. A problem is that the moisture in the air freezes around the outlet of a nozzle, which is called icing phenomenon. It may cause damage to the outlet nozzle of an injector. The frozen ice deposit detached form the nozzle also may cause a considerable damage to the inlet valve or valve seat. In this work, the experimental investigation of the icing phenomenon was carried out. The results showed that the icing phenomenon and process were mainly affected by humidity of inlet air instead of the air temperature in the inlet duct. Also, it was observed that the icing occurs first in the inlet of a nozzle, and grows considerably at the upper part of the nozzle inlet and the opposite side of the nozzle entrance. An LPG fuel, mainly consisting of butane, has lower latent heat of vaporization than that of propane, which is an advantage in controlling the icing phenomenon.
김창업 ( C. U. Kim ),오승묵 ( S. M Oh ),최수진 ( S. J. Choi ),강건용 ( K. Y. Kang ) 한국분무공학회 2004 한국액체미립화학회지 Vol.9 No.2
N/A An experimental studies of conventional gasoline fuel pump were carried out to obtain fundamental data for liquid phase LPG injection(LPLi) system. A regenerative type and a roller-vane type of pumps were investigated in various operational condition. The experiments were performed to obtain flow rate of LPG fuel as a function of pressure differences and temperatures. The regenerative pump had too low flow rate at some experimental conditions to use this pump system for LPLi fuel supply system. On the other hand, the roller-vane type pump can be applied to the system only if its check valve is modified. Cavitation might occur in this system which can result in system noise, flow rate variation, and pump durability problem. To solve these problems the system is needed to increase NPSH_(re)(required net positive suction head).
김창업(C.U.Kim),김창기(C.G.Kim),김승수(S.S.Kim),방효선(H.S.Bang),한정옥(J.O.Han),조양수(Y.S.Cho) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1994 No.11_1
Lean combustion is one of the most promising method for increasing engine efficiency and reducing the exhaust emission from SI gas engines. Due to the possibility of partial burn and misfire, however, under lean bum operation, stable flame kernel formation and fast bum rate are needed to guarantee a successful subsequent combustion.<br/> Experiment data were obtained on a 4-stroke, natural gas fueled SI engine to investigate the effect of compression ratio, swirl, spark plug electrode rotation, center electrode shape and electrode gap width on efficiency and emission.<br/> Experiment has shown that higher compression ratio, swirl vane, favorable rotation of electrode and wider electrode gap width improve the efficiency and stability of engine under lean operational condition.<br/>
김창업 ( C. U. Kim ),오승묵 ( S. M. Oh ),강건용 ( K. Y. Kang ) 한국분무공학회 2003 한국액체미립화학회지 Vol.8 No.2
N/A The liquid phase LPG injection (LPLI) system (the third generation technology) has been considered one of the next generation fuel supply system for LPG vehicles, since it has a very strong potential to accomplish the higher power, higher efficiency, and lower emission characteristics than the mixer type(the second generation technology) fuel supply system. However, when a liquid LPG fuel is injected into the inlet duct of an engine, a large quantity of heat is extracted due to evaporation of fuel. This leads to freezing of the moisture in the air around the outlet of a nozzle, which is called icing phenomenon. It may cause damage to the outlet nozzle of an injector or inlet valve seat. In this work, the experimental investigation of the icing phenomenon was carried out. The results showed that the icing phenomenon and process were mainly affected by humidity of inlet air instead of air temperature in the inlet duct. Also, it was observed that the total ice formed around the nozzle weighs at about 150㎎~260㎎ after injection for ten minutes. And some fuel species were found in the ice attached at the front side of a nozzle, while frozen ice attached at the back of a nozzle was mostly consisted of moisture of inlet air. Therefore, some frozen ice deposit, detached from front nozzle of an injector, may cause a problem of unfavorable air fuel ratio control in the small LPLI engine.
4행정 천연가스 희박연소엔진의 성능향상에 관한 연구(Ⅱ)
방효선(H.S. Bang),한정옥(J.O. Han),조양수(Y.S. Cho),김창기(C.G. Kim),김창업(C.U. Kim),김승수(S.S.Kim) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_1
Lean combustion is one of the most promising method for increasing the engine efficiency and reducing the emission from SI gas engines. Due to the possibility of partial bum and misfire under lean operation, stable flame kernel formation and fast burn rate are needed to guarantee a successful subsequent combustion. Experimental data were obtained on a 4-stroke, natural gas fueled SI engine to investigate the effect of EGR rate and various high energy ignition systems on effeiciency and emissioa It has been found that there is an optimum EGR rate which gives very low NOx emission with slight decrease in efficiency and increase in UHC. Breakdown and long spark duration ignition system have been brought about the improvements in effeciency and its operational stablity under lean operating conditions. Experimental results have also displayed that the prechamber type flame-jet ingnition system extended noticeably the lean operation limit with some sacrifice in thermal efficiency due to throttling and heat losses.<br/>
김창업,이도인,허보영,박흥일 국립경상대학교 공과대학 부설 첨단소재연구소 1993 尖端素材 Vol.3 No.-
The purpose of this paper is to describe the microstructure and the formation mechanism of metal matrix composites with addition of W powder sparyed in the Fe-C-Si alloy by centrifugal atomized casting process. And after casted process has been to heat treatmented for the purpose of WC formation. The fresults of double sprayed W particle and molten gray iron was composite in particle embedded droplet. And after the heat treatment, the amount of WC was prefered segregation in grainboundary between austenite and cementite sturcture.