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An Investigation of Effects of Fuel Stratification and Cooled EGR on DME HCCI Engine's Operating Ranges by Numerical Analysis  

Jeong, Dong-Won (School of Mechanical & Automotive Engineering, Ulsan Univ.)
Amarbayar, D. (Institute of e-Vehicle Technology, Ulsan Univ.)
Lim, Ock-Taeck (School of Mechanical & Automotive Engineering, Ulsan Univ.)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.21, no.2, 2010 , pp. 129-135 More about this Journal
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, $CO_2$ 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.
Keywords
HCCI; Fuel stratification; EGR; Pressure-rise rate; DME;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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