Reader Question: Should gasoline or kerosene be burned in a diesel engine? 1. a measure of the antiknock properties of gasoline Familiarity information: OCTANE NUMBER used as a noun is very rare. Send us feedback. Delivered to your inbox! octane number meaning: 1. a number showing the quality of petrol by representing how well and with how much power it can…. When fuel is used in an engine, the engine will generate a knocking effect. Gasoline characteristics that have an important effect on engines and emissions include its octane number and chemical composition. 2021. It defines a numerical value from 0 to 100, and describes the behavior of the fuel in the engine during combustion. An octane rating of 100 indicates minimal to no knocking (iso-octane), whereas an octane rating of 0 implies that the fuel has a very high knocking tendency (heptane). In broad terms, fuels with a higher octane rating are used in high-performance gasoline engines that achieve higher compression ratios. Octane number is also known as octane rating. Ask Question Asked 4 years, 1 month ago. Gasoline is classified by its research octane number (RON). 'All Intensive Purposes' or 'All Intents and Purposes'? American Heritage® Dictionary of the English Language, Fifth Edition. We define it as a standard measure of the performance of an engine or aviation fuel. Octane Number Definition and Example. The octane number of a gasoline blend was improved within limits for many years by the addition of tetraethyl lead or other antiknock compounds. Hence, octane number definition is extended to allow octane numbers higher than 100. Definition - What does Octane Level mean? Helmenstine, Anne Marie, Ph.D. "Octane Number Definition and Example." A compound Definition Of Octane Number : Thus, the octane number of any fuel is defined ‘as the percentage of iso-octane in a mixture of iso-octane and n-heptane that has the same knocking as … octane number (Noun) a measure of the antiknock properties of an automobile fuel; isooctane having an octane number of 100, a fuel with the same antiknock properties as a mixture of 90% isooctane and 10% heptane having an octane number of 90 Rankovic N, Bourhis G., Loos M., and Dauphin R., "Understanding octane number evolution for enabling alternative low RON refinery streams and octane boosters as transportation fuels", Fuel, vol. Hence, a petrol sample with the same anti-knock quality as that of a mixture containing 90% iso-octane and 10% n -heptane is said to have a RON of 90. Octane number, also called Antiknock Rating, measure of the ability of a fuel to resist knocking when ignited in a mixture with air in the cylinder of an internal-combustion engine.The octane number is determined by comparing, under standard conditions, the knock intensity of the fuel with that of blends of two reference fuels: iso-octane, which resists knocking, and heptane, which knocks readily. What Is Common Rail Direct Injection (CRD)? Updated September 09, 2019. Fuels with low octane number (or high cetane numbers) are used in diesel engines, where fuel is not compressed. octane number. The octane number of a fuel is measured in a test engine, and is defined by comparison with the mixture of iso-octane and normal heptane which would have the same anti-knocking capacity as the fuel under test: the percentage, by volume, of iso-octane in that mixture is the octane number of the fuel. Octane number definition, (of gasoline) a designation of antiknock quality, numerically equal to the percentage of isooctane by volume in a mixture of isooctane and normal heptane that matches the given gasoline in antiknock characteristics. In Britain standard unleaded gasoline is 95RON. Octane Level, also known as octane rating or octane number is the standard measure of the performance fuel for an internal combustion engine. Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. HCCI: Homogeneous Charge Compression Ignition, The Difference Between Deflagration and Detonation, What Is a Molotov Cocktail? Learn a new word every day. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. ‘The higher the octane number you see on a gas pump, the more the fuel can be compressed before it explodes.’ ‘However, ethanol has a good octane rating of around 112 and a high heat-off evaporation so it cools down the intake charge.’ ‘Pyrolysis oil can also be added to gasoline to increase its octane rating.’ The higher an octane number, the more stable the fuel. It is also called the antiknock rate of fuel. Noun 1. octane rating - a measure of the antiknock properties of gasoline octane number quantity, measure, amount - how much there is … Octane number definition is - a number that is used to measure the antiknock properties of a liquid motor fuel (such as gasoline) with a higher number indicating a … Octane number - definition A figure indicating the anti-knock properties of a fuel, based on a comparison with a mixture of iso octane and heptane. Octane number definition differences in different countries. Octane number is also known as octane rating. 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. Octane numbers are based on a scale on which isooctane is 100 (minimal knock) and heptane is 0 (bad knock). What made you want to look up octane number? In contrast, fuels with lower octane numbers (but higher cetane numbers) are ideal for diesel engines, because diesel engines (also referred to as compression-ignition … The higher the octane number, the more compression required for fuel ignition. • OCTANE NUMBER (noun) The noun OCTANE NUMBER has 1 sense:. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! The octane rating of a fuel is also sometimes referred to as the octane number of the fuel. So fuels with a higher octane rating are useful in high-performance gasoline engines that require higher compression ratios. In a spark-ignition engine, using a fuel with too low an octane rating can lead to pre-ignition and engine knock, which can cause engine damage. Post the Definition of octane number to Facebook, Share the Definition of octane number on Twitter. In United States, I have understood that octane numbers are generally lower than in Europe for two reasons. INTRODUCTION Octane Number o It’s a standard measure of the performance of an engine. OCTANE NUMBER AND CETANE NUMBER Cetane number (diesel fuel) and octane number (gasoline) both measure the tendency of the fuel to ignite spontaneously. Octane number is a measure of the performance of a fuel. A mixture of compounds with an identical tendency to auto-ignite, under the same conditions of compression, would thus also be given an octane rating of 95. The octane number seen on pumps at gasoline stations is a value used to indicate the resistance of a motor fuel to knock—that is, to make pinging or ticking sounds in a car's engine when you step on the gas pedal. Helmenstine, Anne Marie, Ph.D. (2020, August 25). Helmenstine, Anne Marie, Ph.D. "Octane Number Definition and Example." n. A numerical representation of the antiknock properties of motor fuel, compared with a standard reference fuel, such as isooctane, which has an octane number of 100. Comparative Study on Gasoline HCCI and DICI Combustion in High Load Range with High Compression Ratio for Passenger Cars Application Motor octane number synonyms, Motor octane number pronunciation, Motor octane number translation, English dictionary definition of Motor octane number. The related term with octane is octane rating or octane number. Gasoline characteristics that have an important effect on engines and emissions include its octane number and chemical composition. 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