cetane number

(redirected from Cetane rating)
Also found in: Dictionary, Wikipedia.
Related to Cetane rating: 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 ?
Biodiesel cleans the fuel system, and it also has a cetane rating equivalent to our top-of-the line premium petroleum diesel.
That's why the Le Mans-winning Audi R10 race car runs on a variant of Shell's commercial "V-Power" diesel, which blends a natural gas-derived GTL component (it has a high cetane rating and minimal sulfur or aromatics) with conventional diesel fuel.
Southern States Power Company (OTC Bulletin Board: SSPC) announced today that the Biodiesel fuel it is now marketing under the trade name "OXy G B-60" has higher cetane rating than regular diesel, making it a new grade of "premium" diesel that leads to increased power and better performance from diesel engines.
HYPERFUELS also carries SynDiesel[R], a synthetic diesel with a 63 cetane rating, storage life of up to 10 years and 20% more BTUs than conventional diesel.
EC Diesel will have a higher cetane rating, with a lower sulfur and aromatics content than diesel used today -- all of which contribute to dramatically lowering emissions while improving performance.
DurAlt(R) products provide up to an 8-12% increase in fuel economy, up to 60% decrease in emissions, reduced engine octane requirement (3-5 octane numbers), a 2 number increase in Diesel fuel cetane rating, and up to a 20% decrease in engine maintenance.
The technology can also produce high-cetane fuels, up to 75 cetane, well above the 42 cetane rating in the diesel fuel widely available in the United States.
This new formulation has 19 percent aromatic hydrocarbons, very low sulfur and a cetane rating of 58.
One of the three samples was able to produce diesel fuel with a cetane rating of 55.
GTL's power rating (cetane) is almost 50% more than the cetane rating of traditional diesel, allowing a reduction in noise and smoke together with improved cold-start properties and improved overall performance.