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 ?
Also, soot emissions decrease with decreasing cetane number [1] due to more homogeneous mixture formation as a result of increased pre-mixed combustion.
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.
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 estimated Derived Cetane Numbers for these blends are in the range 36-40.
The multi linear model resulted in the below displayed formula for the dependency of cetane numbers on the content of ethanol and biodiesel.
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.
An Ignition Quality Tester (IQT) was also used to obtain the blending derived cetane numbers (BDCN) for all the ethanol-FACE fuels and ethanol-PRF blends.
5vol% for both ERO and PRO blends were obtained probably because of significantly lower cetane numbers of ethanol and petrol that may increase the auto-ignition delay of bio-fuel portions injected under heavy loads ([TEXT NOT REPRODUCIBLE IN ASCII].
It has been reported that fuels with low volatility and high cetane numbers generate larger fuel droplets due to their higher viscosities.