燃料中における炭化水素の分子構造とディーゼル排気特性

概要

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The influence of the molecular structure of hydrocarbon fuels on soot, SOF, and NO_x emissions from a diesel engine was analyzed while ignition lag and other physical fuel properties were kept constant. Mixtures of normal paraffin (n-tetradecane) and isoparaffin (heptamethylnonane) were used as a base fuel and one of 5 kinds of hydrocarbons including mono-aromatic, diaromatic, and non-aromatic was added. The aromatic compound content varied in the range of 0〜60 vol% for the mono-aromatic fuel and 0〜40 vol% for the diaromatic fuels. The experimental results showed that regardless of the molecular structure of the fuel, both particulate and NO_x emissions increased linearly with the C/H atomic ratio of fuels under constant ignition lag. The increase in particulate emissions with C/H atomic ratio was caused by increase in the amount of dry soot. SOF, THC, and BSEC were not very much affected by the C/H atomic ratio and molecular structure of the fuels. The fuel properties discussed here showed similar results both in DI and IDI engines.
一般社団法人日本機械学会の論文
1994-03-25