cetane number

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cetane number

a measure of the quality of a diesel fuel expressed as the percentage of cetane in a mixture of cetane and 1-methylnapthalene of the same quality as the given fuel
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Cetane Number

 

an arbitrary quantitative characteristic of the spontaneous combustion of diesel fuels in the cylinder of an engine. As is the case with the octane number of a gasoline, the cetane number of a diesel fuel is determined under strictly controlled conditions; cetane and α-methylnaphthalene, the cetane numbers of which are assumed to be 100 and 0, respectively, are used as the standard references. The ignition quality of a fuel being tested is characterized by determining the composition of a blend of cetane and α-methylnaphthalene that has an equivalent ignition quality. Quantitatively, the cetane number indicates the percentage by volume of cetane in the reference blend. The higher the cetane number of a diesel fuel, the quicker the ignition of the fuel in the engine, the smoother the pressure increase, and the quieter the operation of the engine. The cetane numbers of present-day diesel fuels range from 40 to 55. Additives, such as organic peroxides and nitroalkanes, are used to improve the cetane number.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

cetane number

[′sē‚tān ‚nəm·bər]
(chemical engineering)
The percentage by volume of cetane (cetane number 100) in a blend with α-methylnaphthalene (cetane number 0); indicates the ability of a fuel to ignite quickly after being injected into the cylinder of an engine.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The more the saturated molecules, the higher the cetane number as in the case of palm biodiesel.
A possible explanation for differing cetane numbers, Journal of the American Oil Chemists' Society 75(8): 1007-1013.
Given that biogas has a low cetane number, a dual fuel system is necessary when converting a diesel engine to biogas operation (Papagiannakis et.
[10] Akiyama, H., Nishimura, H., Ibaraki, Y., Iida, N., "Study of diesel spray combustion and ignition using high-pressure fuel injection and a micro-hole nozzle with a rapid compression machine: improvement of combustion using low cetane number fuel", JSAE Review 19, 1998, pp.
Effect of molecular weights of fatty acid esters on cetane numbers as diesel fuels.
The author also carried out tests according to standard EN ISO 5165:1998 which sets up rating the fuel of the compression ignition engine in terms of an arbitrary scale of cetane numbers using a standard single cylinder, 4 stroke engine with variable compression ratio and indirect fuel injection.
Because measuring cetane numbers requires acquiring and maintaining a special Coordinating Fuel Research (CER) test engine, it is a relatively difficult, expensive and sometimes inaccurate process.