602 メタン/DME予混合気の圧縮自着火に関する研究(オーガナイズドセッション : 環境問題とエネルギー)

概要

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Homogeneous charge compression ignition combustion (HCCI) can drastically reduce NOx formation in diesel engines, however, there are problems concerning ignition and combustion control. In this study, the prossibility of a new control method combining two kinds of fuel, whose cetane number are greatly differ, was experimentally investigated using methane/DME mixture. Findings were as follows: 1) self-ignition occurred at the DME equivalence ratio above 0.09 irrespective of the amount of methane. 2) heat release became steeper with overall equivalence ratio and knocking occurred at the equivalence ratio above 0.3. 3) ignition was initiated by a low temperature reaction of DME. Temperature rise due to the heat release of the low temperature reaction caused an oxidation of methane. Therefore, ignition timing of methane could be controlled to some extent by the amounts of DME.
社団法人日本機械学会の論文
2001-09-20