EN 16715:2015

European foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents and materials
6 Apparatus
7 Sampling
8 Apparatus assembly and installation
9 Preparation of apparatus
10 Calibration, verification and quality control
11 Test procedure
12 Calculation
13 Expression of results
14 Precision
15 Test report
Annex A (normative) - Combustion analyser description
Annex B (normative) - Operational details in support to
        the standard test procedure
Bibliography

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.This European Standard specifies a test method for the quantitative determination of ignition and combustion delays of middle distillate fuels intended for use in compression ignition engines. The method utilizes a constant volume combustion chamber with direct fuel injection into heated, compressed synthetic air. A dynamic pressure wave is produced from the combustion of the product under test. An equation is given to calculate the derived cetane number (DCN) from the ignition and combustion delays determined from the dynamic pressure curve.This standard is applicable to middle distillate fuels, fatty acid methyl esters (FAME) and blends of diesel fuels and FAME .The method is also applicable to middle distillate fuels of non-petroleum origin, oil-sands based fuels, blends of fuel containing biodiesel material, diesel fuel oils containing cetane number improver additives and low-sulfur diesel fuel oils. However, users applying this standard especially to unconventional distillate fuels are warned that the relationship between derived cetane number and combustion behaviour in real engines is not yet fully understood. This standard covers the ignition delay range from 2,47 ms to 4,09 ms and combustion delay from 3,71 ms to 6,74 ms (67 DCN to 39 DCN). NOTE 1The combustion analyser can measure shorter or longer ignition and combustion delays, but precision is not known. NOTE 2There is no information about how DCNs outside the 67 to 39 range compares to EN ISO 5165.NOTE 3For 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).