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International Journal of Automotive Technology > Volume 15(4); 2014 > Article
International Journal of Automotive Technology 2014;15(4): 535-541.
doi: https://doi.org/10.1007/s12239-014-0056-0
NUMERICAL ANALYSIS OF THE EFFECT OF INHOMOGENEOUS PRE-MIXTURE ON THE PRESSURE RISE RATE IN AN HCCI ENGINE USING MULTI-ZONE CHEMICAL KINETICS
O. T. LIM
University of Ulsan
ABSTRACT
The HCCI (Homogeneous Charge Compression Ignition) engine is an internal combustion engine under development, which is capable of providing both high diesel-like efficiency and very low NOx and particulate emissions. However, several technical issues must be resolved before the HCCI engine is ready for widespread application. One issue is that its operating range is limited by an excessive pressure rise rate which is caused by the excessive heat release from its selfaccelerated combustion reaction and the resulting engine knock in high-load conditions. The purpose of this study was to evaluate the potential of thermal and fuel stratification for reducing the pressure rise rate in HCCI engines. The NOx and CO concentrations in the exhaust gas were also evaluated to confirm combustion completeness and NOx emissions. The computational work was 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. The engine was fueled with dimethyl ether (DME) which has a unique two-stage heat release, and methane which has a one-stage heat release.
Key Words: Homogeneous charge compression ignition, Combustion, Multizone, Chemical kinetic, Pressure rise rate
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