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조현철 ( H. C. Jo ),오승우 ( S. W. Oh ),이기훈 ( G. H. Lee ),배영주 ( Y. J. Bae ),박권하 ( K. H. Park ) 한국분무공학회 2002 한국액체미립화학회지 Vol.7 No.2
N/A Liquefied petroleum gas (LPG) has been used as motor fuel due to its low emissions and low cost. This study addresses the analysis of the LPG spray behavior near injection nozzle. The LPG spray photographs are compared with sprays of diesel fuel at the same conditions. The LPG spray photos show that the dispersion characteristic depends very sensuously on the ambient pressure soon after injection. The spray angle is very wide in a low ambient pressure condition until the saturated pressure at this test condition, but the angle value is quickly reduced at the condition over the pressure.
나노구리합금첨가 윤활제가 디젤엔진의 성능에 미치는 영향
김대현(D.H.Kim),박권하(K.H.Park),최재성(J.S.Choi) 한국해양대학교 해사산업연구소 2002 海事産業硏究所論文集 Vol.12 No.-
The characteristics of a lubricant is very important when it is used und0r severe running condition. Especially on diesel engines the better lubrication performance is required because of the extreme condition such as high temperature and pressure by combustion process in a cylinder. Many research works for improving a boundary lubrication performance have been executed by using solid lubricant but this general lubricant has not been applied to engine due to the extreme condition of high temperature and pressure in a cylinder. Recently, the solid lubricant which contained a copper nickel alloy has been introduced and studied. In this study, the authors investigated the effects of lubricant which contains the copper nickel alloy nano-powder on a diesel engine performance. The results were manifested to show the increase of maximum torque, and the decrease of cylinder pressure, exhaust gas temperature, scavenging air temperature, CO emission according to running time elapse at various speed and torque on a diesel engine. It was assured that the lubricant which contains the copper nickel alloy nano-powder decreases friction and wear, and simultaneously increases the sealing effect in a cylinder on diesel engines.