Combustion Period

 

  Rapid Combustion Period:

·    Between injection and the start of ignition.

·    Initial droplets enters the cylinder are being heated up by the surrounding charge air and starts to vapourise and ignite.

    Rapid Combustion Period:

·    Fuel that was accumulated during the ignition delay period starts to burn rapidly due to the pre-mixed combustion.

·    This period will be accompanied by a sharp rise in cylinder pressure and fuel injection still continues during this period.

    Steady Burning Period:

·    Combustion has been achieved and the fuel entering the cylinder will burn as soon as they have penetrated, heated, mixed and vapourised.

·    Cylinder pressure rises to its maximum value just after TDC, near the middle of the steady combustion period, and decreases gradually before expansion stroke begins.

   After Burning Period:

·    Combustion continues until the remaining fuel is burnt despite the fact that the injection stops.