octane and cetane number of petrol and diesel pdf

Octane and cetane number of petrol and diesel pdf

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What Is Octane Number: Difference Between Octane Number And Cetane Number [PDF]

Cetane number

Detonation or Knocking

What Is Octane Number: Difference Between Octane Number And Cetane Number [PDF]

Detailed search. The cetane number CN is an indicator of the ignitibility of diesel fuels. It provides information about the ignition delay, i. In an engine that works on the diesel principle, the cetane number is authoritative for describing the quality of the combustion process.

The ignition properties of a fuel not only affect exhaust properties, but also the combustion noise. If the ignition delay is high, for example due to a low cetane number, most of the injected fuel burns explosively. A mixture of n-hexadecane formerly cetane and 1-methylnaphthalene is sought that has the same ignition quality in the same test engine as the fuel in question. Pure cetane is assigned the highest cetane number, i. The cetane number describes the percentage of cetane found in the mixture that corresponds to the ignition quality of the test fuel.

Instead of 1-methylnaphthalene, heptamethylnonane with a cetane number of 15 can also be used as the non-ignitable reference fuel. But fuels can have higher values of 60 or in exceptional cases even Such usually more expensive fuels can burn completely, even under unfavorable engine conditions e.

Because this means that no unburned or partially burned fuel components enter the exhaust, a higher exhaust gas quality is achieved. The cetane number of diesel fuel can be increased by mixing in certain additives such as tetranitromethane, amyl nitrate, acetone peroxide and 2-ethylhexyl nitrate.

In winter, their addition may be necessary to provide sufficient fuel flowability even in heavy frost. One reason for the high cetane numbers achieved by gas-to-liquid diesel is that such synthetic fuels contain no aromatics cyclic compounds. Use of synthetic diesel could replace the sometimes toxic mix of additives that gives conventional diesel fuel higher cetane numbers.

For example, the product qualities of the products traded by Mabanaft and its subsidiaries, or stored at Oiltanking , are also constantly monitored. Status: December All information subject to change. Errors and omissions excepted. Important Terms from A to Z. Crude Oil.

Cetane number

Detailed search. The cetane number CN is an indicator of the ignitibility of diesel fuels. It provides information about the ignition delay, i. In an engine that works on the diesel principle, the cetane number is authoritative for describing the quality of the combustion process. The ignition properties of a fuel not only affect exhaust properties, but also the combustion noise. If the ignition delay is high, for example due to a low cetane number, most of the injected fuel burns explosively. A mixture of n-hexadecane formerly cetane and 1-methylnaphthalene is sought that has the same ignition quality in the same test engine as the fuel in question.


Cetane number (cetane rating) is indicative of the combustion speed of diesel fuel and compression required for inflammation. It plays a similar role for diesel as.


Detonation or Knocking

This paper discusses the effect of ignition delay time in diesel engines on the formation of particulate matter, using fuel formulations with different sulfur concentrations from various sources. Our findings indicate that the cetane number has a significant influence on particulate matter emissions, especially in engines with mechanical fuel injection. The maximum pressure in the combustion chamber increases as the cetane number increases, favoring the increase in the cracking reactions of high molecular weight fractions remaining in the liquid state and thus increasing the production of particulate matter.

Cetane Number

The cetane number is an indicator of ignition quality and thus of fuel quality in the realm of diesel engines. It is conceptually similar to the octane number used for gasoline. Generally, a compound that has a high octane number tends to have a low cetane number and vice versa. The cetane number of a diesel fuel is related to the ignition delay time. In our work the first approach is a statistical one the accuracy of which depends upon the data obtained from various papers and literature sources, as all equations used were based on this data.

Cetane number cetane rating is an indicator of the combustion speed of diesel fuel and compression needed for ignition. It plays a similar role for diesel as octane rating does for gasoline. The CN is an important factor in determining the quality of diesel fuel, but not the only one; other measurements of diesel fuel's quality include but are not limited to energy content, density , lubricity, cold-flow properties and sulphur content. The cetane number or CN of a fuel is defined by finding a blend of cetane and heptamethylnonane with the same ignition delay. Cetane has a cetane number defined to be , while heptamethylnonane's measured cetane number is 15, replacing the former reference fuel alpha-methylnaphthalene , which was assigned a cetane number of 0. Once the blend is known, the cetane number is calculated as a volume-weighted average, rounded to the nearest whole number, of cetane's and heptamethylnonane's

Detailed search. The cetane number CN is an indicator of the ignitibility of diesel fuels. It provides information about the ignition delay, i. In an engine that works on the diesel principle, the cetane number is authoritative for describing the quality of the combustion process. The ignition properties of a fuel not only affect exhaust properties, but also the combustion noise. If the ignition delay is high, for example due to a low cetane number, most of the injected fuel burns explosively. A mixture of n-hexadecane formerly cetane and 1-methylnaphthalene is sought that has the same ignition quality in the same test engine as the fuel in question.

Empirical approach for predicting the cetane number of biodiesel

In the cetane number scale, high values represent fuels that ignite readily and, therefore, perform better in a diesel engine. In the octane number scale, high values represent fuels that resist spontaneous ignition and, therefore, have less tendency to knock in a gasoline engine. Because both scales were developed so that higher numbers represent higher quality for the respective use, high cetane number fuels have low octane numbers, and vice versa.

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