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화학반응수치해석을 이용한 HCCI기관의 예혼합기의 성층화성이 연소시의 압력 상승률에 미치는 영향
임옥택(Ocktaeck LIM),박규열(Kyuyoel Park),백영순(Youngsoon Baek),표영덕(Youngduk Pyo) 한국가스학회 2009 한국가스학회 학술대회논문집 Vol.2009 No.4
The HCCI engine is prospective internal combustion engine, which is capable of providing both high diesel-like efficiencies and very low NOx and particulate emissions. However, several technical issues must be resolved before an HCCI engine can be used as widespread application. One of issues is that its operating range is limited by an excessive pressure rise rate which is caused by excessive heat release because of its self-accelerated combustion reaction and the resulting engine knock in high-load region. The purpose of this study is to evaluate the potential of thermal and fuel stratification for reducing pressure rise rate in an HCCI engine. The concentration of NOx and CO in exhaust gas is also evaluated to confirm the combustion completeness and NOx emission. The computational work is conducted using a multi-zone code with detailed chemical kinetics, including the effects of thermal and fuel stratification on the onset of ignition and the rate of combustion.