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Potential of Fuel Stratification for Reducing Pressure Rise Rate in HCCI Engines  

Lim, Ock-Taeck (School of Mechanical and Automotive Engineering, University of Ulsan)
Publication Information
Journal of the Korean Institute of Gas / v.14, no.6, 2010 , pp. 7-14 More about this Journal
Abstract
This study investigated the effect on reducing the pressure rise rate(PRR) in HCCI Engine by the variation of mixing ratio in the pre-mixture of DME and n-Butane that has different auto-ignition characteristics. In addition to measure of gas pressure in the engine cylinder, chemiluminescence image using the optical accessible engine and numerical analysis with multi-zones model were used to assess the combustion at each local area in the combustion chamber. The maximum PRR changes depending on mixing condition of DME and n-Butane. When DME is stratified and n-Butane is distributed uniformly, maximum PRR becomes lowest which is about 0.25MPa/ms and it corresponds to 5deg. retarding of CA50.
Keywords
combustion; knocking / chemiluminescence; DME; HCCI; n-Butane; numerical analysis; pressure rise rate; stratification;
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