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분위기 조건이 직접분사식 인젝터의 미립화에 미치는 영향
신영진(Young-jin Sin),이중순(Joong-soon Lee),윤수한(Soo-han Yoon),정성식(Sung-sik Cheong),하종률(Jong-yul Ha) 한국자동차공학회 2001 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
Several efforts to meet the exhaust gas regulation have been undertaken by many researchers in recent years. Main researches are on development of design techniques of intake port and combustion chamber, atomization of fuel and precise control of air-fuel ratio, post-treatment of exhaust gas and so on. Engine technology is changed from PFI to GDI to correspond with exhaust gas regulation. GDI technique makes it possible to preserve lean air-fuel ratio and control accurate air-fuel ratio. Nevertheless, It is not cleared that information of spray characteristics and atomization process are very dependent on fluctuation of pressure and change of temperature in intake stroke. In this study, a constant volume combustion chamber is manufactured to investigate various fluctuations of in-cylinder pressure for injection duration. It is taken photographs of injection process of conventional GDI injector using PMAS. Then, it was verified experimently that ambient conditions as temperature and pressure of combustion chamber have effects on process of spray growth and atomization of fuel.<br/>