ユニフロー型舶用過給ディーゼル機関における燃料多段噴射条件が大気汚染物質に与える影響の数値シミュレーション

抄録

A calculation code for simulating spray combustion in the marine Diesel engine of uniflow scavenging was created, taking formation / extinction of NOx and soot and a skeletal reaction scheme into consideration. The influence of multistage fuel injection on the emission of NOx and soot from a supercharged marine Diesel engine of uniflow scavenging was examined by this calculation code. As the results of calculations carried out changing the amount and timing of pilot- and after-injection, it was found that NOx decreased by pilot-injection. On the other hand, after- injection from the same fuel injector was not able to decrease soot. So after-injection from the dedicated fuel injector was performed on a trial basis, and it was confirmed that the reduction of soot exhaust could be realized.