What Are the Different Types of Octane Gas?

Gasoline octane number is a numerical indicator for measuring the anti-knocking combustion ability of gasoline in a cylinder. A high value indicates that the anti-knock performance is good. When the gasoline is normally burned in the cylinder, the flame propagation speed is 10m / s 20m / s, and it can reach 1500m / s 2000m / s during detonation combustion. The latter will cause the cylinder temperature to rise sharply, the gasoline to burn incompletely, and the machine to vibrate strongly, which will reduce the output power and damage the parts. Iso-octane, which has the same molecular equation as octane, has the least explosion, so we set its octane number to 100. The standard isooctane number is usually specified as 100, and the n-heptane octane number is specified as zero. These two standard fuels are mixed at different volume ratios to obtain various liquids with different shock resistance levels. Compare with the fuel under test under the same conditions. The percentage of isooctane contained in the mixed solution with shock resistance equal to the sample is the octane number of the sample. Gasoline has a large octane number, good shock resistance, and good quality. Multiplying the percentage of different types of hydrocarbons in gasoline by their octane number adds up to the octane number of that gasoline.

Gasoline octane number

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Gasoline octane number is a numerical indicator for measuring the anti-knocking combustion ability of gasoline in a cylinder. A high value indicates that the anti-knock performance is good. When the gasoline is normally burned in the cylinder, the flame propagation speed is 10m / s ~ 20m / s, and it can reach 1500m / s ~ 2000m / s during detonation combustion. The latter will cause the cylinder temperature to rise sharply, the gasoline to burn incompletely, and the machine to vibrate strongly, which will reduce the output power and damage the parts. Iso-octane, which has the same molecular equation as octane, has the least explosion, so we set its octane number to 100. The standard isooctane number is usually specified as 100, and the n-heptane octane number is specified as zero. These two standard fuels are mixed at different volume ratios to obtain various liquids with different shock resistance levels. Compare with the fuel under test under the same working conditions. The percentage of isooctane contained in the mixed solution with shock resistance equal to the sample is the octane number of the sample. Gasoline has a large octane number, good shock resistance, and good quality. Multiplying the percentage of different types of hydrocarbons in gasoline by their octane number adds up to the octane number of that gasoline.

Chinese name

Gasoline octane number

transmission speed

10m / s 20m / s

Temperature

1500m / s 2000m / s

Express

Good explosion resistance

Classification and explanation

Hydrocarbons with different chemical structures have different anti-knock capabilities. Isooctane (2,2,4-trimethylpentane) has better explosion resistance, and the octane number is given as 100. N-heptane has poor explosion resistance, given as 0. The measurement of gasoline octane number is based on iso-octane and n-heptane as standard fuels, and according to standard conditions, the comparison method is carried out on a laboratory standard single-cylinder gasoline engine. The proportion of the standard fuel composition is adjusted so that the knocking intensity produced by the standard fuel is the same as that of the sample. At this time, the volume percentage of isooctane in the standard fuel is the octane number of the sample. Depending on the measurement conditions, there are the following octane numbers:

Motor octane measurement conditions are harsh, the engine speed is 900r / min, and the intake air temperature is 149 ° C. It reflects the gasoline anti-knock performance of the car under high speed and heavy load conditions.

The conditions for measuring the octane number of the research method are moderate, the rotation speed is 600 r / min, and the intake air is room temperature. This octane number reflects the gasoline's anti-knock performance when the car is driving slowly in urban areas. For the same gasoline, the research method octane number is about 0-15 units higher than the motor method octane number. The difference between the two is called sensitivity or sensitivity.

Road octane number is also called driving octane number. It is measured with a car or measured on a full-power test bench by simulating the driving conditions of a car on a highway. Road octane number can also be calculated by empirical formula using motor method and research method. The average of the motor octane number and the research octane number is called the anti-knock index, which can approximate the road octane number.

Beijing Lanbo Hi-Tech

How to determine the steam octane number based on motor method and research method?

The most famous of these is the RASX-100M octane tester produced by the Russian Academy of Sciences, which is widely used throughout the world. Its measurement method meets international standards: octane measurement conforms to: ASTM D 2699-86, ASTM D 2700 -86.

Measuring principle of octane tester

The principle of an octane tester is measured by measuring the insulation permeability and electromagnetic induction charge characteristics of the octane number of gasoline and the cetane number of diesel oil. The results are determined by measuring the dielectric properties of the sample and comparing it with known parameters stored in memory. The instrument is very sensitive and can detect small changes in dielectric parameters. It can detect octane number, cetane number and other petroleum product parameters.

Its main features are,

More comprehensive and accurate measurement of various data of petroleum products

Repeatable error range is 0.5 octane units with temperature correction

The absolute error is close to the static measurement and is less than 0.5 octane units.

Measurement of various gasolines with additives

RON, MON and anti-knock index (AKI) are displayed at the same time. AKI = (RON + MON) / 2.

Measuring diesel cetane number, diesel type and condensation temperature

Powerful processing chip can quickly and accurately process data, compatible with WINDOW system