Ignition delay period
Ignition delay period is considered to be the first phase of the
combustion process of a diesel engine.
This is the period from when fuel is atomized and injected into
a cylinder until combustion.
In the figure to the right, fuel sprayed into high pressure
compressed air a few degrees before compression top dead center
(Point A) is vaporized by the heat of the air, approaches the
ignition point (Point B), and ignites.
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