cetane number


Also found in: Dictionary, Wikipedia.
Related to cetane number: diesel index

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

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.

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.
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.
In addition to use even higher octane number fuels as premixed fuel to create stronger reactivity gradient, it is also interesting to explore the characteristics of using higher cetane number (CN) fuels as DI fuel to create stronger reactivity gradient within in this combustion concept.
The naphtha was chosen because it possesses physical characteristics similar to gasoline, but has a cetane number relatively close to the minimum number available with market ULSD.
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.