Table of Contents
What is a measure of the antiknock quality of a fuel?
The anti-knock quality of a fuel in a given engine operating condition is defined by its octane index OI = RON – KS where K is a constant for that condition and S is the sensitivity, (RON-MON), and RON and MON are the Research and Motor Octane numbers respectively.
What is antiknock index of a fuel?
Antiknock Index (AKI) :- It means the arithmetic average of the Research Octane Number (RON) and Motor Octane Number (MON): AKI = (RON + MON)/2. The automotive fuel rating for gasoline is the antiknock index (octane rating).
What is antiknock value?
Fuels are compared with a reference fuel under like operating-conditions, the antiknock value being expressed as the percentage of increase in maximum permissible horsepower.
How is octane rating measured?
Octane Ratings and Engine Knock The octane number of gasoline is a measure of its resistance to knock. The octane number is determined by comparing the characteristics of a gasoline to isooctane (2,2,4-trimethylpentane) and heptane. Isooctane is assigned an octane number of 100.
What is the antiknock value of n heptane?
7.1. The octane number of a fuel is measured based on two reference hydrocarbon derivatives of n-heptane with an assigned octane number of zero and isooctane (2,2,4-trimethylpentane) with assigned octane number of 100. A mixture of 70% v/v iso-octane and 30% v/v n-heptane has an octane number of 70.
Which of the following is used as antiknock compound in gasoline?
Organic lead (tetraethyl lead) is used as an antiknock agent in gasoline and jet fuels. Tetraethyl lead is absorbed rapidly by the skin, the lungs, and the gastrointestinal tract.
What is the antiknock value of n-heptane?
What is the meaning of Antiknock?
: serving or intended to prevent detonation in the combustion process of an internal-combustion engine an antiknock agent an anti-knock fuel additive.
Is used as antiknock compound?
TEL is a colourless viscous liquid and is a well-known anti-knocking compound. TetraEthyl Lead is used for raising the octane number of petrol.
How is octane in fuel measured?
The most common type of octane rating worldwide is the Research Octane Number (RON). RON is determined by running the fuel in a test engine with a variable compression ratio under controlled conditions, and comparing the results with those for mixtures of iso-octane and n-heptane.
What does isooctane mean?
octane
: an octane of branched-chain structure or a mixture of such octanes especially : a flammable liquid octane used in determining the octane number of fuels.
What does cetane number of diesel fuel measure?
Cetane rating, also known as cetane number is a measurement of the quality or performance of diesel fuel. The higher the number, the better the fuel burns within the engine of a vehicle. The cetane number is similar to the octane rating in that it is a rating assigned to a fuel to rate the quality of its combustion.