Preservation of the global environment and diversification of energy sources have become pressing issues in recent years, and there have been demands for the reduction of nitrogen oxides (NOx) and particulate matter (PM) that are the principal causes of air pollution in the exhaust gas of diesel engines. In this research, therefore, DME was supplied to a test diesel engine at a point 600 mm upstream of the intake port, and the premixed mixture was burned in an HCCI process. The resultant flame light was extracted from the combustion chamber and analyzed to determine the combustion characteristics.
