燃料噴射期間と雰囲気条件が噴霧燃焼特性に及ぼす影響

抄録

Effects of fuel injection duration and ambient conditions on ignition and combustion characteristics of diesel spray in a high temperature and high pressure vessel was experimentally examined using single hole nozzle. The fuel injection duration was changed from 0.4ms to 1.2ms. The ambient temperature was changed from 860K to 985K. The ambient density was 15kg/m³. The flame temperature and the KL factor were quantified through an image analysis technique using two-color method. From the experiments, it is confirmed that, the injection duration has little effects on ignition delay and flame temperature at initial stage. As the decrease of ambient temperature, the ignition delay becomes longer and the flame temperature becomes lower. From the discussion of the 1D KL factor distribution, it is confirmed that the soot production at the head vortex region and that at the quasi-steady region have to be discussed separately. From the discussion of total KL factor it is confirmed that, as injection duration increased, soot production at the quasi-steady region increased proportionally.