농도성층화와 Cooled EGR이 DME HCCI 엔진의 운전영역에 미치는 영향에 관한 수치해석 = An Investigation of Effects of Fuel Stratification and Cooled EGR on DME HCCI Engine’s Operating Ranges by Numerical Analysis

다국어 초록 (Multilingual Abstract)

Homogeneous charge compression ignition (HCCI) engines have the potential to provide both diesel-like efficiency and very low emissions of nitrogen oxide (NOx) and particulate matter(PM). However, several technical issues still must be resolved before HCCI can see application. Among these, steep pressure-rise rate which leads to narrow operating range of HCCI engine continues to be a major issue. This work investigates the combination of two methods to mitigate the excessive pressure-rise rates at high power output,namely fuel stratification and Cooled exhaust-gas recirculation (Cooled EGR), after identifying the each effects to pressure-rise rate. When applying the fuel stratification to simulation, total fuelling width of 0.15 at BDC is set as a equivalent ratio difference based on the previous research. In order to simulate the effects of cooled EGR, CO2 mole fraction in pre-mixture is changed ranging from 0 to 30%. DME which has a characteristic of two-stage ignition is used as a fuel.

참고문헌 (Reference)

1 정동원, "온도 성층화를 이용한 DME HCCI 엔진의 운전 영역 확장에 관한 수치해석 연구" 한국수소및신에너지학회 20 (20): 344-351, 2009

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4 J.A.Eng, "Characterization of Pressure Waves in HCCI Combustion" SAE 2002

5 A.E.Luz, "CHEMKIN-II: A FORTRAN Chemical Kinetics Pacagefor the Analysis of Gas-Phase Chemical Kinetics" Sandia National Laboratories 1989

6 S.W.Kim, "An Experimental Study of EGR Effect on Reducing the Noise of CAI Engine" 37-42, 2008

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