抄録
Ignition and combustion characteristics of stoichiometric Dimethyl ether (DME)/Air mixture are investigated by using a micro flowreactor with controlled temperature profile which is smoothly increasing from the room temperature to the ignition temperature. Special attention is paid to the multi-stage oxidation in low temperature oxidation. Various flame responses were observed by changing incoming mixture velocity. Stable double weak luminous zones at low velocity region are observed. One-dimensional computation with detail chemistry showed stationary three-stage oxidation defined by the triple peaks in the heat release rate profile at relevant low velocity region. To interpret discrepancy between experimental double weak flames and computational triple flames, gas sampling was conducted for obtaining major species distributions in the flowreactor. The results indicated that low-temperature oxidation occurs in the upstream side of the experimental first luminous zone. Thus, three-stage oxidation can be indi9ated as a stationary phenomon experimentally and computationally.
