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김남호(Namho Kim),이준용(Junyong Lee),이경현(Kyeongheyon Lee),민경덕(Kyoungdoug Min) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Higher specific power and thermal efficiency of DISI system compared to those of MPI system has led to wide adoption of DISI system for SI engines. Since DISI system injects fuel directly into the cylinder, wall wetting may occur and it must be prevented to reduce HC emission. In order to prevent wall wetting, spray characteristics of multi-hole injector must be studied more carefully. Previous studies have focused on the measurement of multi-hole injector performance using single fuel but only a few studies have been done on the multi-hole injector performance using a variety of fuels Although gasoline sold in other countries have similar components, they have different properties such as volatility. It is reported that the use of low volatility gasoline leads to increase in HC emission. Therefore, in this study, the effect of fuel properties on the spray penetration length and spray width was studied by injecting various fuels at the various injection pressure and ambient pressure, and taking images of fuel injection using high speed CCD camera. The obtained images were analyzed by the image processing code and spray penetration length and spray area of various fuels were compared.