1 Scope
This European Standard specifies a test method for the quantitative determination
of ignition delay of middle distillate fuels intended for use in compression ignition engines. The
method utilizes a constant volume combustion chamber designed for operation by compression
ignition, and employing direct injection of fuel into compressed air that is controlled
to a specified pressure and temperature. An equation is given to calculate the derived cetane number (DCN) from the ignition delay measurement.
This method is applicable to diesel fuels, including those containing FAME. The method
is also applicable to middle distillate fuels of non-petroleum origin, although users
applying this standard are warned that the relationship between ignition characteristics
and engine performance in unconventional fuels is not yet fully understood. The standard
covers the ignition delay range from 2,9 ms to 5,0 ms (60 DCN to 35 DCN).
NOTE For the purpose of this European Standard, the expression “% (V/V)” is used to represent the volume fraction (φ), and “% (m/m)” the mass fraction (ω).
WARNING The use of this standard may involve hazardous materials, operations and equipment. This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.