What is the cetane number ?
Cetane Number are nothing but the indicator of performance of engine and combustion process.
It is an index of the Ignition Quality (Ignition delay characteristics ) of diesel fuel which defines the way combustion proceeds in the engine .
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It is used for compression engines. (C.I engine ).
It is Shortly written as CN.
It is determined by comparing the Ignition quality of standard solution (cetane +Alpha -methyl Naphthalene ) with Ignition quality being tested.
It is the percentage of cetane contained in the standard solution which has an Ignition delay equalling the Ignition delay of fuel tested.
Good Ignition quality CN =100
Higher the CN ,Better is the fuel ,shorter is the Ignition delay, and easier id the starting of combustion.
CN varies from 35 to 55.
If density increase , CN decrease.