Improvement of Fuel Consumption of Turbo Charged Diesel Engine Fueled with DME

Past research has shown that the trade-off of nitrogen oxides (NOx) and carbon dioxide (CO2) emission from diesel engine fueled with dimethyl ether (DME) is improved by setting an exhaust gas recirculation (EGR) system to Low Pressure Loop. This paper further investigates low fuel consumption and emission of DME diesel engine, the influences of change of compression ratio, nozzle diameter and chamber shape on engine performance and emission characteristics. これまでの研究で，DME過給ディーゼルエンジンのEGRシステムをLow Pressure Loopにすることで，NOxとCO2のトレードオフが改善することを明らかにした．本稿では，燃費と排出ガスを更に低減する為の知見を得ることを目的として，圧縮比の変化，ノズルの小噴孔径化および燃焼室形状がエンジン性能に及ぼす影響を調べた．