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

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 ?
Gasoline has a high octane number and conversely a very low cetane number which means that it has low autoignition reactivity.
This is due to low heating value and cetane number of ethanol-diesel, DEE blends that will cause more fuel to get inducted into the combustion chamber to carry the same load as by the pure diesel.
For oil blending, low octane petrol (grade A-76/80) with a cetane number ranging from 20 to 25 and an auto-ignition temperature slightly lower (300[degrees]C) than that of RO would be the most suitable.
This method reduces the molecular weight of the original oil to one third of its former value, reduces the viscosity, and increases the volatility and cetane number to levels comparable to that of diesel fuel.
Derived cetane number (DCN) of the fuel samples are calculated based on the ignition delay range; i.
It has been observed from the variation of cylinder pressure for iron oxide nano particles doped fuel blends give low combustion pressure compared to that of standard diesel due to shorter ignition delay of iron oxide nanoparticles doped diesel fuels and may be due to higher cetane number of the blended fuel.
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.
For newer diesel engines that use exhaust gas recirculation, evidence indicates that increasing the cetane number may reduce emissions of unburned hydrocarbons when operating in a low-temperature environment.
Przedmiot Supply Should Meet The Quality Parameters In Accordance With Directive 98/70 / Ec Annex Ii: The Following Are Shown Additionally Selected Quality Requirements For Diesel Oil Which Is The Subject Of The Contract * Properties - Unit - Range Of Cetane Number = Min.
Normally, cetane number does not constitute part of the jet fuel specifications but is measured for multifuel engine requirements.
1998) and Van Gerpen (1996), there are several problems of applying RME to be overcome (unstable cetane number depending on storage time and participating glycerol content).
Biodiesel has a higher cetane number than conventional diesel, which reduces the tendency toward engine knocking.