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( Shunsuke Gotoh ),( Tatsuya Kuboyama ),( Yasuo Moriyoshi ),( Koichi Hatamura ),( Junichi Takanashi ),( Toshio Yamada ) 한국액체미립화학회 2010 한국액체미립화학회 학술강연회 논문집 Vol.2010 No.-
The objective of this research is to extend the HCCI operational range by using direct fuel injection system and also our original blowdown supercharge (BDSC) system. The effect of in-cylinder fuel distribution on HCCI operational range was numerically and experimentally investigated. Firstly, a numerical simulation using a multi zone reaction model was carried out. The results showed that a uniform fuel distribution decreases the pressure rise rate (dP/dθ) with the thermal distribution generated by the BDSC system. Next, experiments were carried out using a gasoline engine equipped with the direct fuel injection and BDSC systems. The fuel injection timing, the fuel mass ratio between the direct injection and the port injection was varied as an experimental parameter to investigate the effect of the fuel distribution on the high load HCCI operational limits. The experimental results showed that the HCCI operational robustness at the high load operation was successfully improved by using the direct fuel injection. However, high load HCCI operational limit was hardly extended. Next, by using the endothermic effect of fuel, enhancement of thermal stratification was tested. However, the relationship between CA50 and dP/dθmax was not improved.