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What is Research Octane Number mean?
An octane rating, or octane number, is a standard measure of a fuel's ability to withstand compression in an internal combustion engine without detonating. The higher the octane number, the more compression the fuel can withstand before detonating. Octane rating does not relate directly to the power output or the energy content of the fuel per unit mass or volume, but simply indicates gasoline's capability against compression. In broad terms, fuels with a higher octane rating are used in higher-compression gasoline engines, which may yield higher power. Such higher power comes from the fuel's higher compression by the engine, and not directly from the gasoline.
In contrast, fuels with lower octane (but higher cetane numbers) are ideal for diesel engines, because diesel engines (also called compression-ignition engines) do not compress the fuel, but rather compress only air and then inject fuel into the air that was heated by compression. Gasoline engines rely on ignition of air and fuel compressed together as a mixture, which is ignited near the end of the compression stroke by electric spark plugs. Therefore, high compressibility of the fuel matters mainly for gasoline engines. Using gasoline with lower octane may cause engine knocking.
The octane rating of aviation gasoline was extremely important in determining fighter performance in the aircraft of World War II. The octane rating alone did not determine the performance of the gasoline, but also the versatility of the fuel in handling a range of lean to rich operating conditions.
referencePosted on 13 Dec 2024, this text provides information on Miscellaneous in Academic & Science related to Academic & Science. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.
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