About diesel engine combustion !

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Diesel engine combustion can be schematically divided
in three stages

J.B.Heywood,Internal Combustion Engine Fundamentals,McGraw-Hill,New York,1988

:

The first one,called ignition delay,in which the fuel injected in the combustion chamber accumulates without burning;

The second one,in which a sudden development of the premixed charge takes place;

And the third one,in which the combustion of the remaining portion of the fuel injected develops in heterogeneous phase,called diffusive comustion.

The harshness,which is the distinctive aspect of diesel combustion,is caused by the sudden development of combustion of the premixed charge formed during the ignition delay.