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The exhaust gas composition was analyzed by gas chromatography, and combustion completion was investigated in a 2-stroke Homogeneous Charge Compression Ignition (HCCI) engine. The experiment was performed using n-Butane as a typical pure fuel to easily identify the origin of exhaust gas components. The effect of maximum gas temperature on combustion completion was investigated by both the experiment and the calculation. From the measurements of unburned n-Butane emission, the thickness of the quenching layer was estimated.

Thermal and mixing stratifications have been thought as one of the ways to avoid an excessive pressure rise on HCCI combustion. The purpose of this research is to investigate the potential of thermal and mixing stratifications for reducing PRR (Pressure Rise Rate) on HCCI combustion. The pre-mixture with thermal and mixing stratifications is charged in RCM (Rapid Compression Machine). After that, the pre-mixture is compressed and in that process, in-cylinder gas pressure and chemiluminescence images are obtained and analyzed. Furthermore, experimental results are compared with the computational results calculated by using multi-zone model for analyzing these mechanisms.