Diesel Injector Fuel Injector 0445120151 Bosch for Ko-Matsu PC200-8 PC210-8 SAA6d107e-1 Engine Cummins Industrial Engines

Effect of Double Injector on Combustion Process in a 396 Series Diesel Engine (part 6)

Figure 6, Figure 7 and Figure 8 show that, when the injection duration is shortened, the ignition

delay period is slightly shortened and the combustion start point is advanced. The higher the peak combustion heat release rate is, the earlier the corresponding phase is. When the maximum combustion pressure is increased, the corresponding phase is advanced. When the maximum average temperature in cylinder is increased, the corresponding phase is advanced but the average temperature in cylinder during the latter combustion period is slightly reduced. The combustion heat release is concentrated, the accumulated heat release is basically the same, but the NO emission is significantly increased.13

As the injection start point is maintained at 352°CA, with the shorter injection duration, the fuel

sprayed into the cylinder is increased through the same crank angle and the penetrating distance is increased.14 This is conductive to the more fuel mixing with air and better fuel atomization, so the ignition delay period is shortened, the pre-mixed combustion of fuel is increased, and the diffusion combustion gets quicker. As a result, combustion heat release is concentrated, combustion pressure and cylinder temperature are increased, and NO production is increased accordingly15. Figure 9 shows the diesel component distribution taken from the cross section at the same height as the nozzle hole at 380°CA. It can be found out that as the injection duration is shortened, the combustion starts earlier and is more concentrated; in addition, the residual diesel component is reduced at 380°CA and the post-combustion part is also reduced. This is conductive to the improvement of effective power.