cetane number

cetane number
   a measure of the ability of diesel fuel to reduce engine knocking. The cetane number plays the same role in diesel engine technology that the octane number plays in conventional automobile engine technology. It is the percentage by volume of cetane which must be added to methylnaphthalene to give the mixture the same resistance to knocking as the diesel fuel sample being tested. Cetane is the name of a hydrocarbon compound whose molecules contain 16 carbon atoms and 34 hydrogen atoms, the 16 carbons being arranged in a long chain. Adding one oxygen atom to cetane produces cetyl alcohol, a waxy compound found in whale oil. The words "cetyl" and "cetane" are both derived from the Latin word cetus for a whale.

Dictionary of units of measurement. 2015.

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  • Cetane number — or CN is a measurement of the combustion quality of diesel fuel during compression ignition. It is a significant expression of diesel fuel quality among a number of other measurements that determine overall diesel fuel quality. Contents 1… …   Wikipedia

  • cetane number — n. a number that increases with higher quality, representing the ignition properties of diesel engine fuel oils: it is determined by the percentage of cetane that must be mixed with a standard liquid to match the fuel oil s performance in a… …   English World dictionary

  • cetane number — cetaninis skaičius statusas T sritis Standartizacija ir metrologija apibrėžtis Dyzelinių degalų arba dyzelino savaiminio užsidegimo variklio cilindre rodiklis. Kuo mažesnis laiko tarpas nuo degalų patekimo į cilindrą iki jų užsidegimo, tuo… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • cetane number — cetaninis skaičius statusas T sritis Standartizacija ir metrologija apibrėžtis Sutartinės skalės skaičius, rodantis dyzelino užsidegimo kokybę standartinėmis sąlygomis. atitikmenys: angl. cetane number vok. Cetanzahl, f rus. цетановое число, n… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • cetane number — cetano skaičius statusas T sritis Energetika apibrėžtis Dyzelinių degalų savaiminio užsidegimo variklio cilindre rodiklis. atitikmenys: angl. cetane number vok. Zetanzahl, f rus. цетановое число, n pranc. indice de cétane, m …   Aiškinamasis šiluminės ir branduolinės technikos terminų žodynas

  • cetane number — cetaninis skaičius statusas T sritis chemija apibrėžtis Dyzelino savaiminio užsidegimo variklio cilindre rodiklis. atitikmenys: angl. cetane number rus. цетановое число …   Chemijos terminų aiškinamasis žodynas

  • cetane number — A method of rating diesel oil or fuel by measuring the time lapse between fuel injection and ignition to determine how easy it is to ignite and how fast it will burn. The lower the cetane number, the higher the temperature required to burn the… …   Dictionary of automotive terms

  • cetane number — noun Date: 1935 a measure of the ignition value of a diesel fuel that represents the percentage by volume of cetane in a mixture of liquid methylnaphthalene that gives the same ignition lag as the oil being tested called also cetane rating… …   New Collegiate Dictionary

  • cetane number — noun or cetane rating : a measure of the ignition value of a diesel fuel oil : the percentage by volume of cetane in a mixture of cetane and 1 methylnaphthalene that gives the same ignition lag as the oil being tested …   Useful english dictionary

  • cetane number — a measure of the ignition quality of a diesel engine fuel by comparison with various mixtures in which the alpha form of methylnaphthalene is given a standard value of 0 and cetane is given a standard value of 100. Also called cetane rating.… …   Universalium

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