抄録
In the cylinder, combustion stages of fuel vaporization, air fuel mixing, low-temperature oxidation, thermal ignition, reactions toward thermal equilibrium, and bum-up of products, proceed at different timings and rates in local areas. As a result, products in these stages exist at the same time. In the enclosed field filled with a lot of eddies, products in one stage can be mixed with those in other stages. When it is now that thermal ignition is triggered, low-temperature oxidation was in the past, and soot will be in future. In this sense, products at a moment can be mixed with those in the past or future. This mechanism of mixing, dubbed time-domain mixing, is considered essential for describing combustion in the cylinder. For ignition control as new approach to in-cylinder combustion control, it is important to understand influence of time-domain mixing on low-temperature oxidation. Modeling with detailed kinetics of dimethyl ether shows that CH2O entrained by time-domain mixing, acts as an OH scavenger in the initial stage of low-temperature oxidation, or as a thermal-ignition retardant.
