501 DME/空気予混合圧縮着火燃焼における低温酸化反応特性(環境とエネルギー,オーガナイズドセッション)

概要

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Enhancement of low temperature reaction (LTR) is found to be useful for inhibiting precipitous high temperature reaction in homogeneous charge compression ignition (HCCI). The numerical analysis based on detailed chemical kinetic reaction model was conducted for DME/Air HCCI process, in order to examine the LTR stop mechanism. From the calculation results, it was shown that the LTR would stop when the CH_2O production rate surpasses the OH production rate during DME oxidation reaction process, because the CH_2O is exceptionally reactive with OH which plays a critical role in chain-branching reaction. On the basis of this mechanism, the LTR stop index was proposed and confirmed to hold on broad conditions. It was also indicated that low temperature, high boost pressure, high EGR and low equivalent ratio were effective to expand LTR in real engine operation.
一般社団法人日本機械学会の論文
2008-09-12