Abstract
The compression ignition of Dimethyl Ether has two stages of combustion, which were known as cool and hot flame respectively. Since the temperature and pressure of mixture was increased by the heat release during cool flame, the amount of heat release during cool flame has strong effects on ignition of hot flame. In this paper, the effects of N_2/CO_2 addition on heat release of cool flame were investigated from experiments and computations. The heat release on cool flame was reduced with N_2 addition, however, it was increased with CO_2 addition. From the systematic experiments and chemical kinetic computations, it was confirmed that the amount of heat release at cool flame depends strongly on the concentration of O_2at cool flame onset.
