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 It might be outdated or ideologically biased.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 ?
Cetane number significantly affects the specificities of engine like exhaust expulsion and ignition parameters [30].
Differences among the traces are due to the properties of the fuel; cetane number affects the ignition delay and accordingly the combustion phasing.
where CN represents the cetane number of the final mixture, [W.sub.i] is the mass fraction of individual FAME, and [CN.sub.i] is the cN of the pure FAME.
Then physical properties of biodiesel composed from cetane number, kinematic viscosity, kinematic viscosity, density and higher heating value were calculated in Table 2.
The cetane number was found higher than regular diesel standards.
T he general properties like density, viscosity, cloud point, flash point, cetane number, moisture contents and pH were evaluated with the help of Certain ASTM Standards.
The addition of ethanol in diesel oil causes in the latter physical and chemical changes, noticeable reduction in cetane number, viscosity, and flash point (LI et al., 2005).
They compensate for their low density with higher energy content and cetane number, and the higher consistency of the fuel molecules mean they combust more uniformly in diesel engines compared with conventional refinery diesel, resulting in lower emissions.