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낮은 엔진 부하의 운전조건에서 흡기포트 내 물 분사에 따른 가솔린 직접분사 엔진의 연소 특성
전해강,이경환,최명식,박수한,Jeun, Haegwang,Lee, Kyung-Hwan,Choi, Myungsik,Park, Suhan 한국액체미립화학회 2018 한국액체미립화학회지 Vol.23 No.2
The purpose of this study is to investigate the effect of water injection on combustion characteristics of gasoline direct injection (GDI) engine with turbo-charger under low-load operating condition. The test engine used in this study has four-cylinder and 10.2 of compression ratio. In order to study the effect of water injection ratio on combustion characteristics, the water was injected into the intake port from 10% to 50%, based on fuel injection quantity. From the experiment, it revealed that the water injection induced the improvement of fuel economy because of the advance of spark-timing by the reduction of in-cylinder temperature. In addition, the water injection caused the prolong of extension of the ignition delay and slight increase of burn duration.