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분위기 조건이 직접분사식 인제터의 미립화에 미치는 영향
이증순(J . S . Lee) 한국분무공학회 2001 한국액체미립화학회지 Vol.6 No.1
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.
이증원,이택호,정해광 大韓成形外科學會 1981 Archives of Plastic Surgery Vol.8 No.2
Dermoid cyst of the nose presents difficult management problem because of its complexity and rarity. Confusion with other benign lesions such as sebaceous cyst, inclusion cyst, hemangioma, lipoma, glioma, encephalocele is possible. Incompletely excised cyst recurs and the final result is usually less acceptable than that following total complete excision. One case of dermoid cyst with sinus tract of the nose treated surgically is presented.